PLUG / Plug Power Inc. - SEC-arkivering, Årsberetning, Fuldmagtserklæring

Plug Power Inc.
US ˙ NasdaqCM ˙ US72919P2020

Grundlæggende statistik
LEI 549300JPDKRSJ8JSM954
CIK 1093691
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Plug Power Inc.
SEC Filings (Chronological Order)
Denne side giver en komplet, kronologisk liste over SEC-arkiveringer, eksklusive ejerskabsregistreringer, som vi leverer andre steder.
June 4, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 2, 2026 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 2, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

June 4, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Defin

June 4, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Defi

May 29, 2026 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report PLUG POWER INC. (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report PLUG POWER INC. (Exact Name of Registrant as Specified in Charter) Delaware 1-34392 22-3672377 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 125 VISTA BOULEVARD, SLINGERLANDS, NEW YORK 12159 (Address of Principal Executive Offi

May 11, 2026 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number:

May 11, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 11, 2026 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 11, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

May 11, 2026 EX-10.3

haute direction de la Société, y compris à Monsieur Haycraft, tel que détaillées ci-dessous. 3. C’est dans ce cadre que les Parties se sont rapprochées en vue de signer un second avenant au Contrat de travail du Salarié intégrant les nouvelles modali

Exhibit 10.3 AVENANT N°2 AU CONTRAT DE TRAVAIL A DUREE INDETERMINEE AMENDMENT N°2 TO INDEFINITE-TERM EMPLOYMENT AGREEMENT English translation without contractual effect ENTRE LES SOUSSIGNÉES BETWEEN THE UNDERSIGNED PLUG POWER INC., une société du Delaware régie par le droit de l’État de New York, dont le siège social se situe 125 Vista Boulevard, Slingerlands New York, États-Unis, représentée par

May 11, 2026 EX-99.1

Plug Power Reports Strong Q1 2026 Results with 22% Revenue Growth and 71% Margin Improvement Year over Year

Exhibit 99.1 Plug Power Reports Strong Q1 2026 Results with 22% Revenue Growth and 71% Margin Improvement Year over Year SLINGERLANDS, N.Y., May 11, 2026 — Plug Power Inc., a global leader in hydrogen solutions, today reported results for the first quarter of 2026, delivering strong revenue growth, meaningful margin improvement, and continued progress toward profitability. The Company exceeded its

May 11, 2026 EX-10.2

Article 2 – Rémunération Article 2 – Remuneration A compter du 1 er Décembre 2024, le Salarié percevra une rémunération annuelle fixe forfaitaire de base de 414,000 euros bruts payable en douze mensualités égales par virement bancaire (la « Rémunérat

Exhibit 10.2 AVENANT AU CONTRAT DE TRAVAIL A DUREE INDETERMINEE AMENDMENT TO INDEFINITE-TERM EMPLOYMENT AGREEMENT English translation without contractual effect ENTRE LES SOUSSIGNÉES BETWEEN THE UNDERSIGNED PLUG POWER INC., une société du Delaware régie par le droit de l’État de New York, dont le siège social se situe au 968 Albany Shaker Road, Latham, 12110 New York, États-Unis, représentée par M

May 11, 2026 EX-10.1

2 Mr. Benjamin HAYCRAFT acceptsthis employment and formally declaresthat he is not bound to any other company, that he has left his previous employer free from any commitments whatsoever, and in particular that he is not subject to any non-competitio

Exhibit 10.1 1 CONTRAT DE TRAVAIL A DUREE INDETERMINEE INDEFINITE TERM EMPLOYMENT CONTRACT ENTRE LES SOUSSIGNES : BETWEEN: PLUG POWER INC., une société du Delaware régie par le droit de l’État de New York, dont le siège social se situe au 968 Albany Shaker Road, Latham, 12110 New York, États-Unis, représentée par Madame Tammy Kimble en sa qualité de Vice-Présidente des Ressources Humaines (« VP of

April 30, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

April 30, 2026 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Ru

April 30, 2026 ARS

ARS

2025 ANNUAL REPORT TO STOCKHOLDERS UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

March 10, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 4, 2026 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 4, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

March 6, 2026 EX-FILING FEES

Table 1: Newly Registered Securities

Calculation of Filing Fee Tables S-8 PLUG POWER INC Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee 1 Equity Common Stock, par value $0.

March 6, 2026 S-8

As filed with the Securities and Exchange Commission on March 6, 2026

As filed with the Securities and Exchange Commission on March 6, 2026 Registration No.

March 2, 2026 EX-10.25

NON-EMPLOYEE DIRECTOR COMPENSATION POLICY

Exhibit 10.25 NON-EMPLOYEE DIRECTOR COMPENSATION POLICY Date Approved February 27, 2026 Department Legal Department PLUG POWER INC. THIRD AMENDED & RESTATED NON-EMPLOYEE DIRECTOR COMPENSATION POLICY As adopted by the Plug Power Inc. Board of Directors February 27, 2026 The purpose of this Third Amended & Restated Non-Employee Director Compensation Policy (the “Policy”) of Plug Power Inc. (the “Com

March 2, 2026 EX-10.6

EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.6 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of the 2nd day of March, 2026 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Dean C. Fullerton (the “Executive”). WHEREAS, the Executive and the Company have determined to enter into an agreement related to the employment of the Executive by the Company; N

March 2, 2026 EX-10.1

PLUG POWER, Inc. NON-EXECUTIVE CHAIRMAN AGREEMENT

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. INFORMATION THAT WAS OMITTED HAS BEEN NOTED IN THIS DOCUMENT WITH A PLACEHOLDER IDENTIFIED BY THE MARK “[***]”. PLUG POWER, Inc. NON-EXECUTIVE CHAIRMAN AGREEMENT This Non-Executive Chairman Agreement (the “Agreement”)

March 2, 2026 EX-4.13

PLUG POWER INC. DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

Exhibit 4.13 PLUG POWER INC. DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Plug Power, Inc., a Delaware corporation, has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, referred to herein as the Exchange Act: common stock, par value $0.01 per share, referred to herein as the Common St

March 2, 2026 EX-10.3

EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.3 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of the 2nd day of March, 2026 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Jose Luis Crespo (the “Executive”). WHEREAS, the Executive and the Company have determined to enter into an agreement related to the employment of the Executive by the Company; NO

March 2, 2026 EX-10.5

EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.5 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of the 2nd day of March, 2026 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Gerard L. Conway, Jr. (the “Executive”). WHEREAS, the Executive and the Company have determined to enter into an agreement related to the employment of the Executive by the Compan

March 2, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 2, 2026 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 2, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

March 2, 2026 10-K

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT For the transition period from to Commission file number: 1-34392 Plug Powe

March 2, 2026 EX-10.11

PLUG POWER INC. INDEMNIFICATION AGREEMENT (For Directors of a Delaware Corporation)

Exhibit 10.11 125 Slingerlands Boulevard Slingerlands, NY 12159 PLUG POWER INC. INDEMNIFICATION AGREEMENT (For Directors of a Delaware Corporation) This Indemnification Agreement (“Agreement”) is made this day of 20 by and between Plug Power Inc., a Delaware corporation (the “Company”), and (“Indemnitee”). RECITALS WHEREAS, the Company desires to attract and retain the services of highly qualified

March 2, 2026 EX-19.1

PROCEDURES AND GUIDELINES GOVERNING SECURITIES TRADES BY INSIDERS

Exhibit 19.1 PROCEDURES AND GUIDELINES GOVERNING SECURITIES TRADES BY INSIDERS Date Revised March 2, 2026 Revision # 16 Department Legal Department PLUG POWER INC. PROCEDURES AND GUIDELINES GOVERNING SECURITIES TRADES BY INSIDERS (“Insider Trading Policy”) I. PURPOSE Plug Power Inc., along with its subsidiaries or affiliates (the “Company”) seeks to prevent the misuse of material, non-public infor

March 2, 2026 EX-10.4

EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.4 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of the 2nd day of March, 2026 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Paul B. Middleton (the “Executive”). WHEREAS, the Executive and the Company have determined to enter into an agreement related to the employment of the Executive by the Company; N

March 2, 2026 EX-21.1

Plug Power Inc. Subsidiaries

Exhibit 21.1 Plug Power Inc. Subsidiaries Below is a list of Plug Power Inc.’s wholly owned subsidiaries. The names of certain subsidiaries have been omitted because, considered in the aggregate as a single subsidiary, they would not constitute, as of December 31, 2025, a “significant subsidiary” as that term is defined in Rule 1-02(w) of Regulation S-X. Plug Power Europe SAS Plug Power Hydrogen H

March 2, 2026 EX-10.2

PLUG POWER INC. TRANSITIONAL CONSULTING AGREEMENT

Exhibit 10.2 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. INFORMATION THAT WAS OMITTED HAS BEEN NOTED IN THIS DOCUMENT WITH A PLACEHOLDER IDENTIFIED BY THE MARK “[***]”. PLUG POWER INC. TRANSITIONAL CONSULTING AGREEMENT This Transitional Consulting Agreement (the “Agreement”

March 2, 2026 EX-99.1

Plug Power Reports Q4 and Full Year 2025 Results with Strong Sales Growth and Margin Expansion Achieved Positive 4th Quarter 2025 Gross Margin Setting the Stage for 2026 Financial Targets

Exhibit 99.1 FOR IMMEDIATE RELEASE Plug Power Reports Q4 and Full Year 2025 Results with Strong Sales Growth and Margin Expansion Achieved Positive 4th Quarter 2025 Gross Margin Setting the Stage for 2026 Financial Targets Slingerlands, NY – March 2, 2026 – Plug Power Inc., a global leader in comprehensive hydrogen solutions for the hydrogen economy, today announced financial results and operation

March 2, 2026 EX-10.10

PLUG POWER INC. INDEMNIFICATION AGREEMENT (For Officers of a Delaware Corporation)

Exhibit 10.10 125 Slingerlands Boulevard Slingerlands, NY 12159 PLUG POWER INC. INDEMNIFICATION AGREEMENT (For Officers of a Delaware Corporation) This Indemnification Agreement (“Agreement”) is made this day of 20 by and between Plug Power Inc., a Delaware corporation (the “Company”), and (“Indemnitee”). RECITALS WHEREAS, the Company desires to attract and retain the services of highly qualified

February 26, 2026 EX-99.1

Plug Power Executes $132.5 Million Definitive Agreement with Stream Data Centers as First Step in $275 Million Strategic Infrastructure Optimization Initiative First of three phases of targeted strategic infrastructure optimization initiative

Exhibit 99.1 Plug Power Executes $132.5 Million Definitive Agreement with Stream Data Centers as First Step in $275 Million Strategic Infrastructure Optimization Initiative First of three phases of targeted strategic infrastructure optimization initiative SLINGERLANDS, N.Y., February 26, 2026 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the hydrogen eco

February 26, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2026 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

February 26, 2026 EX-10.1

PURCHASE AND SALE AGREEMENT AND JOINT ESCROW INSTRUCTIONS (6840 Crosby Road, Basom, New York 14013)

Exhibit 10.1 PURCHASE AND SALE AGREEMENT AND JOINT ESCROW INSTRUCTIONS (6840 Crosby Road, Basom, New York 14013) THIS PURCHASE AND SALE AGREEMENT AND JOINT ESCROW INSTRUCTIONS (“Agreement”) is made and entered into as of February 24, 2026 (the “Effective Date”), by and between PLUG POWER INC., a Delaware corporation (“Plug Power”) and PLUG PROJECT HOLDING CO., LLC, a Delaware limited liability com

February 13, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 12, 2026 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 12, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

February 13, 2026 EX-3.1

SIXTH CERTIFICATE OF AMENDMENT OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF PLUG POWER INC. (Pursuant to Section 242 of the General Corporation Law of the State of Delaware)

Exhibit 3.1 SIXTH CERTIFICATE OF AMENDMENT OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF PLUG POWER INC. (Pursuant to Section 242 of the General Corporation Law of the State of Delaware) Plug Power Inc., a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), hereby certifies as follows: FIRST: Upon the effectiveness of this Si

February 11, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 11, 2026 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 11, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

February 11, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

February 11, 2026 EX-99.1

MEDIA ADVISORY

Exhibit 99.1 MEDIA ADVISORY For Immediate Release Plug Power Accelerates Reconvened Session of Special Meeting of Stockholders to Thursday, February 12, 2026 Meeting Date Moved Earlier; Stockholders Encouraged to Vote and Participate Virtually Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the hydrogen economy, today announced that it is accelerating the re

February 10, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

February 6, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

February 5, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 5, 2026 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 5, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

February 4, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

February 3, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

February 2, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

January 30, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 29, 2026 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 29, 2026 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

January 30, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

January 29, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

January 27, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

January 23, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

January 6, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 30, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 30, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

January 6, 2026 EX-10.1

RELEASE EVENT LICENSE AGREEMENT

Exhibit 10.1 RELEASE EVENT LICENSE AGREEMENT THIS RELEASE EVENT LICENSE AGREEMENT (“Agreement”) is made effective on December 30, 2025 (“Effective Date”), is by and between Plug Power Inc. on its behalf and on behalf of its Affiliates (“Plug Power”) and Walmart Inc. on its behalf and on behalf of its Affiliates (“Walmart”). Either Walmart or Plug Power may be individually referred to as “Party” as

December 31, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

December 22, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

December 17, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

December 12, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

December 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 3, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 3, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

December 3, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

November 26, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

November 21, 2025 EX-99.2

Plug Power Inc. Announces Pricing of Offering of $375.0 Million of 6.75% Convertible Senior Notes

Exhibit 99.2 Plug Power Inc. Announces Pricing of Offering of $375.0 Million of 6.75% Convertible Senior Notes SLINGERLANDS, N.Y. – November 18, 2025 – Plug Power Inc. (“Plug Power”) (NASDAQ: PLUG) today announced the pricing of $375.0 million aggregate principal amount of 6.75% Convertible Senior Notes due 2033 (the “notes”) in a private offering (the “offering”) to qualified institutional buyers

November 21, 2025 EX-4.1

PLUG POWER INC. U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee Dated as of November 21, 2025 6.75% Convertible Senior Notes due 2033 TABLE OF CONTENTS

Exhibit 4.1 Execution Version PLUG POWER INC. AND U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee INDENTURE Dated as of November 21, 2025 6.75% Convertible Senior Notes due 2033 TABLE OF CONTENTS Page Article 1 Definitions Section 1.01 . Definitions 1 Section 1.02 . References to Interest 15 Article 2 Issue, Description, Execution, Registration and Exchange of Notes Section 2.01 . Design

November 21, 2025 EX-99.1

Plug Power Inc. Announces Private Offering of $375 Million of Convertible Senior Notes

Exhibit 99.1 Plug Power Inc. Announces Private Offering of $375 Million of Convertible Senior Notes SLINGERLANDS, N.Y. – November 18, 2025 – Plug Power Inc. (“Plug Power”) (NASDAQ: PLUG) today announced its intention to offer, subject to market conditions and other factors, $375 million aggregate principal amount of Convertible Senior Notes due 2033 (the “notes”) in a private offering (the “offeri

November 21, 2025 EX-99.3

Plug Power Nets $399 Million in Cash Following Successful Financing; Eliminates First Lien and Fully Funds Current Business Plan

Exhibit 99.3 FOR IMMEDIATE RELEASE Plug Power Nets $399 Million in Cash Following Successful Financing; Eliminates First Lien and Fully Funds Current Business Plan Slingerlands, N.Y., November 21, 2025 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the hydrogen economy, today announced the successful closing of the previously announced offering of $375 mi

November 21, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2025 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

November 21, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

November 20, 2025 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

November 18, 2025 EX-99.1

1 November 18, 2025 Plug Power, CEO Andy Marsh 2 Disclaimer The presentation materials, remarks, discussions, Q&A sessions, and other content provided during the 2025 Plug Symposium (collectively, the “Materials”) contain “forward-looking statements”

Exhibit 99.1 1 November 18, 2025 Plug Power, CEO Andy Marsh 2 Disclaimer The presentation materials, remarks, discussions, Q&A sessions, and other content provided during the 2025 Plug Symposium (collectively, the “Materials”) contain “forward-looking statements” about Plug Power Inc. (“Plug” or the “Company”). Plug intends these forward-looking statements to be covered by the safe harbor provisio

November 18, 2025 EX-99.2

Plug Power Hosts Seventh Annual Symposium Highlighting Hydrogen’s Role in Energy Independence

Exhibit 99.2 Plug Power Hosts Seventh Annual Symposium Highlighting Hydrogen’s Role in Energy Independence SLINGERLANDS, N.Y., Nov. 18, 2025 - Plug Power Inc. (NASDAQ: PLUG), a global leader in hydrogen solutions for the hydrogen economy, is hosting its seventh annual Plug Power Symposium at the Company’s headquarters and manufacturing facility in Slingerlands N.Y., centered on the theme “Strength

November 18, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 10, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Num

November 10, 2025 EX-99.1

Plug Power to Generate Over $275 Million Through Monetization of Electricity Rights and Operational Efficiencies; Supports Major U.S. Data Center Build-Out

Exhibit 99.1 Plug Power to Generate Over $275 Million Through Monetization of Electricity Rights and Operational Efficiencies; Supports Major U.S. Data Center Build-Out LATHAM, N.Y., November 10, 2025 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the hydrogen economy, today announced that it expects to generate more than $275 million in liquidity improve

November 10, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 10, 2025 EX-99.1

Plug Power Third Quarter 2025 Highlights $177 Million in Quarterly Revenue Continued Global Market Expansion and Operational Progress

Exhibit 99.1 Plug Power Third Quarter 2025 Highlights $177 Million in Quarterly Revenue Continued Global Market Expansion and Operational Progress SLINGERLANDS, N.Y., November 10, 2025 - Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the hydrogen economy, today announced its financial results and operational milestones for the third quarter ended September

November 10, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

October 10, 2025 144

144

144 0002085249 XXXXXXXX LIVE 0001093691 PLUG POWER INC 001-34392 125 VISTA BOULEVARD SLINGERLANDS NY 12159 5187827700 Haycraft Benjamin Officer COMMON RBC CAPITAL MARKETS LLC 250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401 10000 38000.

October 8, 2025 424B5

PLUG POWER INC. Warrants to Purchase 185,430,464 Shares of Common Stock Pre-funded Warrants to Purchase 154,430,464 Shares of Common Stock

TABLE OF CONTENTS   Filed pursuant to Rule 424(b)(5)  Registration No. 333-287577 Prospectus Supplement (To Prospectus dated May 27, 2025) PLUG POWER INC. Warrants to Purchase 185,430,464 Shares of Common Stock Pre-funded Warrants to Purchase 154,430,464 Shares of Common Stock We are offering to an investor holding warrants (the “Investor”), which we previously issued on March 20, 2025 (the “March

October 8, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Warrants to purchase Common Stock 457(r) 185,430,464 $ 0.

October 8, 2025 EX-4.2

Plug Power Inc. Pre-Funded Warrant To Purchase Common Stock

Exhibit 4.2 Plug Power Inc. Pre-Funded Warrant To Purchase Common Stock Warrant No.: Number of Shares of Common Stock: Date of Issuance: October , 2025 (“Issuance Date”) Plug Power Inc., a company organized under the laws of State of Delaware (the “Company”), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, [HOLDER], the regi

October 8, 2025 EX-4.1

Plug Power Inc. Warrant To Purchase Common Stock

Exhibit 4.1 Plug Power Inc. Warrant To Purchase Common Stock Warrant No.: Number of Shares of Common Stock: Date of Issuance: October , 2025 (“Issuance Date”) Plug Power Inc., a company organized under the laws of State of Delaware (the “Company”), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, [HOLDER], the registered hold

October 8, 2025 EX-1.1

PLUG POWER INC.

Exhibit 1.1 PLUG POWER INC. October 8, 2025 To: Holder of the Existing Warrants (as defined) Re: Amendment to and Exercise of Existing Warrants to Purchase 185,430,464 Shares of Common Stock of Plug Power Inc. originally issued to the holder on March 20, 2025 Dear Holder: Plug Power Inc. (the “Company”) is pleased to offer to you the opportunity to amend and subsequently exercise for cash all of t

October 8, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 8, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 8, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

October 7, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 3, 2025 Plug Power Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 3, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incor

October 7, 2025 EX-99.1

Plug Power Names Jose Luis Crespo as Incoming CEO to Succeed Long-Term Leader Andy Marsh CEO transition to take effect in March 2026

Exhibit 99.1 Plug Power Names Jose Luis Crespo as Incoming CEO to Succeed Long-Term Leader Andy Marsh CEO transition to take effect in March 2026 SLINGERLANDS, N.Y., Oct. 7, 2025 - Plug Power Inc. (NASDAQ: PLUG), a global leader in end-to-end hydrogen solutions for the hydrogen economy, today announces the appointment of Jose Luis Crespo as President, effective as of October 10, 2025, and as its n

September 30, 2025 EX-1.1

AMENDMENT NO. 4 TO AT MARKET ISSUANCE SALES AGREEMENT

Exhibit 1.1 AMENDMENT NO. 4 TO AT MARKET ISSUANCE SALES AGREEMENT September 29, 2025 B. Riley Securities, Inc. 299 Park Avenue, 21st Floor New York, NY 10171 Yorkville Securities, LLC 1012 Springfield Avenue Mountainside, NJ 07092 Ladies and Gentlemen: Plug Power Inc., a Delaware corporation (the “Company”), and B. Riley Securities, Inc. are parties to that certain At Market Issuance Sales Agreeme

September 30, 2025 424B5

$1,000,000,000 Common Stock

 Filed Pursuant to Rule 424(b)(5)  Registration No. 333-287577 PROSPECTUS SUPPLEMENT NO. 1 (To Prospectus Supplement dated August 15, 2025) (To Prospectus dated May 27, 2025) $1,000,000,000 Common Stock This supplement amends, supplements and updates the prospectus supplement, dated August 15, 2025 (collectively, the “prospectus supplement”), relating to the sale of our shares of common stock havi

September 30, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 29, 2025 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 29, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

September 22, 2025 424B7

PLUG POWER INC. Warrants to Purchase 185,430,464 Shares of Common Stock Offered by the Selling Stockholder

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(7)  Registration No. 333-287577 Prospectus Supplement (To Prospectus dated May 27, 2025) PLUG POWER INC. Warrants to Purchase 185,430,464 Shares of Common Stock Offered by the Selling Stockholder This prospectus supplement relates to the potential resale from time to time of some or all of the 185,430,464 shares of our common stock, par value $0.01

September 22, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid Fees Previously Paid Carry Forward Securities Carry Forward Securities 1 Equity Common stock, par value $0.

September 22, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2025 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

September 16, 2025 144

144

144 0002085249 XXXXXXXX LIVE 0001093691 PLUG POWER INC 001-34392 125 VISTA BOULEVARD SLINGERLANDS NY 12159 5187827700 Haycraft Benjamin Toby Patrick Officer COMMON RBC CAPITAL MARKETS LLC 250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401 10972 17445.

August 15, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 15, 2025 Plug Power Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 15, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incor

August 15, 2025 EX-1.1

AMENDMENT NO. 3 TO AT MARKET ISSUANCE SALES AGREEMENT

Exhibit 1.1 Execution Version AMENDMENT NO. 3 TO AT MARKET ISSUANCE SALES AGREEMENT August 15, 2025 B. Riley Securities, Inc. 299 Park Avenue, 21st Floor New York, NY 10171 Ladies and Gentlemen: Plug Power Inc., a Delaware corporation (the “Company”), and B. Riley Securities, Inc. (the “Agent”), are parties to that certain At Market Issuance Sales Agreement dated January 17, 2024 (the “Original Ag

August 15, 2025 424B5

$1,000,000,000 Common Stock

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-287577 PROSPECTUS SUPPLEMENT (To Prospectus dated May 27, 2025) $1,000,000,000 Common Stock We have entered into an At Market Issuance Sales Agreement, dated January 17, 2024, as amended by Amendment No. 1, dated February 23, 2024, Amendment No. 2, dated November 7, 2024, and Amendment No. 3, dated August 15, 2025 (collectiv

August 15, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid Fees Previously Paid Carry Forward Securities Carry Forward Securities 1 Equity Common Stock, par value $0.

August 12, 2025 EX-99.1

Plug Power Second Quarter Earnings Call August 11, 2025

Exhibit 99.1 Plug Power Second Quarter Earnings Call August 11, 2025 Presenters Teal Hoyos, Vice President, Marketing and Communications Andy Marsh, Chief Executive Officer José Luis Crespo, Chief Revenue Officer Paul Middleton - Chief Financial Officer Sanjay Shrestha, President Q&A Participants Colin Rusch - Oppenheimer Craig Irwin - Roth Capital Partners Manav Gupta - UBS David Acaro - Morgan S

August 12, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 11, 2025 Plug Power Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 11, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incor

August 11, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 11, 2025 Plug Power Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 11, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incor

August 11, 2025 EX-99.1

Plug Power Second Quarter 2025 Highlights ·       Execution on Project Quantum Leap helps accelerate business sales growth and financial performance ·       Q2 revenue up 21% year-over-year, driven by broad hydrogen demand

Exhibit 99.1 Plug Power Second Quarter 2025 Highlights ·       Execution on Project Quantum Leap helps accelerate business sales growth and financial performance ·       Q2 revenue up 21% year-over-year, driven by broad hydrogen demand LATHAM, N.Y., August 11, 2025 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the hydrogen economy, today announced its fi

August 11, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number:

July 9, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 8, 2025 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 8, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

July 9, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 3, 2025 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 3, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

July 9, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, par value $0.

July 9, 2025 424B7

PLUG POWER INC. Up to 31,500,000 Shares of Common Stock Offered by Selling Stockholder

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(7)  Registration No. 333-287577 Prospectus Supplement (To Prospectus dated May 27, 2025) PLUG POWER INC. Up to 31,500,000 Shares of Common Stock Offered by Selling Stockholder This prospectus supplement relates to the potential resale from time to time of some or all of the 31,500,000 shares of our common stock, par value $0.01 per share, that may b

July 9, 2025 EX-4.1

Warrant to Purchase Common Stock dated July 8, 2025.

Exhibit 4.1 NEITHER THIS SECURITY NOR THE SECURITIES AS TO WHICH THIS SECURITY MAY BE EXERCISED HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REG

July 8, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 7, 2025 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 7, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

July 8, 2025 EX-99.1

Plug Power The Big Beautiful Bill and the Impact to our Business July 7, 2025

Exhibit 99.1 Plug Power The Big Beautiful Bill and the Impact to our Business July 7, 2025 Presenters Teal Hoyos - VP, Marketing and Communications Andy Marsh - Chief Executive Officer Paul Middleton - Chief Financial Officer Sanjay Shrestha - President Q&A Participants Colin Rusch - Oppenheimer Andrew Scott - Roth Capital Partners Sameer Joshi - HC Wainwright Dushyant Ailani – Jefferies Chris Den

July 3, 2025 EX-99.1

Copyright 2021, Plug Power Inc. Plug Power Annual Meeting of Stockholders July 3, 2025

Exhibit 99.1 Copyright 2021, Plug Power Inc. Plug Power Annual Meeting of Stockholders July 3, 2025 2 This presentation will include “forward - looking statements” about Plug Power Inc. (“Plug”). These forward - looking statements wil l contain projections of Plug’s future results of operations, or of Plug’s business or financial position, or other forward - looking statements. We intend these for

July 3, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 3, 2025 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 3, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

June 9, 2025 ARS

ARS

2024 ANNUAL REPORT TO STOCKHOLDERS UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

June 9, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Ru

June 6, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid Fees Previously Paid Carry Forward Securities Carry Forward Securities 1 Equity Common Stock, par value $0.

June 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2025 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

June 6, 2025 424B7

PLUG POWER INC. 54,966,188 Shares of Common Stock Offered by Selling Stockholder

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(7)  Registration No. 333-287577 Prospectus Supplement (To Prospectus dated May 27, 2025) PLUG POWER INC. 54,966,188 Shares of Common Stock Offered by Selling Stockholder This prospectus supplement relates to the potential resale from time to time of some or all of the 54,966,188 shares of our common stock, par value $0.01 per share, that were issued

June 6, 2025 EX-3.1

Certificate of Designation of Series F Mirroring Preferred Stock dated June 5, 2025

Exhibit 3.1 CERTIFICATE OF DESIGNATION OF SERIES F MIRRORING PREFERRED STOCK OF PLUG POWER INC. Plug Power Inc. (the “Company”), a corporation incorporated and existing under the General Corporation Law of the State of Delaware (the “DGCL”), does hereby certify: That pursuant to the authority expressly conferred upon the Board of Directors of the Company (the “Board”) by the Company’s Amended and

June 6, 2025 424B7

PLUG POWER INC. 3,461,371 Shares of Common Stock Offered by the Selling Stockholders

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(7)  Registration No. 333-287577 Prospectus Supplement (To Prospectus dated May 27, 2025) PLUG POWER INC. 3,461,371 Shares of Common Stock Offered by the Selling Stockholders This prospectus supplement relates to the potential resale from time to time of some or all of the 3,461,371 shares of our common stock, par value $0.01 per share (the “common s

June 6, 2025 EX-3.1

Certificate of Designation of Series F Mirroring Preferred Stock dated June 5, 2025

Exhibit 3.1 CERTIFICATE OF DESIGNATION OF SERIES F MIRRORING PREFERRED STOCK OF PLUG POWER INC. Plug Power Inc. (the “Company”), a corporation incorporated and existing under the General Corporation Law of the State of Delaware (the “DGCL”), does hereby certify: That pursuant to the authority expressly conferred upon the Board of Directors of the Company (the “Board”) by the Company’s Amended and

June 6, 2025 EX-10.1

Securities Purchase Agreement dated June 5, 2025 between Plug Power Inc. and Andrew J. Marsh

Exhibit 10.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of June 5, 2025 between Plug Power Inc., a Delaware corporation (the “Company”), and Andrew J. Marsh (the “Purchaser”). WHEREAS, subject to the terms and conditions set forth in this Agreement and in compliance with Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities

June 6, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid Fees Previously Paid Carry Forward Securities Carry Forward Securities 1 Equity Common Stock, par value $0.

June 6, 2025 EX-10.1

Securities Purchase Agreement dated June 5, 2025 between Plug Power Inc. and Andrew J. Marsh

Exhibit 10.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of June 5, 2025 between Plug Power Inc., a Delaware corporation (the “Company”), and Andrew J. Marsh (the “Purchaser”). WHEREAS, subject to the terms and conditions set forth in this Agreement and in compliance with Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities

June 6, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2025 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

June 2, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Definitive Proxy State

May 30, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report PLUG POWER INC. (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report PLUG POWER INC. (Exact Name of Registrant as Specified in Charter) Delaware 1-34392 22-3672377 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 125 VISTA BOULEVARD, SLINGERLANDS, NEW YORK 12159 (Address of Principal Executive Offi

May 30, 2025 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Ru

May 27, 2025 S-3ASR

As filed with the Securities and Exchange Commission on May 27, 2025

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on May 27, 2025 Registration No.

May 27, 2025 EX-FILING FEES

Filing fee table.

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, par value $0.

May 27, 2025 EX-4.25

Form of Indenture for Debt Securities.

Exhibit 4.25 PLUG POWER INC. Issuer AND [TRUSTEE] as Trustee INDENTURE Dated as of [●], 202 Debt Securities Table Of Contents PAGE article 1 DEFINITIONS 1 Section 1.01 Definitions of Terms 1 article 2 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES 5 Section 2.01 Designation and Terms of Securities 5 Section 2.02 Form of Securities and Trustee’s Certificate 8 Section

May 12, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number:

May 12, 2025 EX-99.1

Plug Reports First Quarter 2025 Financial Results Commissioning of Louisiana hydrogen plant, global electrolyzer momentum, and improved cash flow positions Plug for continued commercial growth

Exhibit 99.1 FOR IMMEDIATE RELEASE Plug Reports First Quarter 2025 Financial Results Commissioning of Louisiana hydrogen plant, global electrolyzer momentum, and improved cash flow positions Plug for continued commercial growth SLINGERLANDS, N.Y., May 12, 2025 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions, today announced its financial results and operationa

May 12, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2025 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

April 30, 2025 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A Amendment No. 1 (Mark One)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A Amendment No. 1 (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission f

April 28, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2025 Plug Power Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorp

April 28, 2025 EX-10.1

Secured Debenture Purchase Agreement, dated as of April 28, 2025, by and between Plug Power Inc. and YA II PN, Ltd., as buyer.

Exhibit 10.1 SECURED DEBENTURE PURCHASE AGREEMENT THIS SECURED DEBENTURE PURCHASE AGREEMENT (this “Agreement”), dated as of April 28, 2025, is between PLUG POWER INC., a company incorporated under the laws of the State of Delaware, with principal executive offices located at 125 Vista Boulevard, Slingerlands, New York 12159 (the “Company”), and YA II PN, Ltd., a Cayman Islands exempt limited compa

April 28, 2025 EX-99.1

Plug Power Signs $525 Million Secured Credit Facility with Yorkville Advisors and Reports Strong Preliminary Q1 2025 Results

Exhibit 99.1 FOR IMMEDIATE RELEASE Plug Power Signs $525 Million Secured Credit Facility with Yorkville Advisors and Reports Strong Preliminary Q1 2025 Results SLINGERLANDS, N.Y., April 28, 2025 – Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions, today announced it has signed a definitive agreement for a secured debt facility and achieved key operational and fina

March 20, 2025 EX-4.1

Form of Common Warrant.

EX-4.1 3 tm259816d1ex4-1.htm EXHIBIT 4.1 Exhibit 4.1 FORM OF WARRANT Plug Power Inc. Warrant To Purchase Common Stock Warrant No.: Number of Shares of Common Stock: Date of Issuance: March [20], 2025 (“Issuance Date”) Plug Power Inc., a company organized under the laws of State of Delaware (the “Company”), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of w

March 20, 2025 EX-1.1

Underwriting Agreement, dated March 19, 2025, by and among Plug Power Inc. and Oppenheimer & Co. Inc., as representative of the several underwriters named in Schedule I thereto.

Exhibit 1.1 PLUG POWER INC. 46,500,000 Shares of COMMON STOCK, PAR VALUE $0.01 PER SHARE Warrants to Purchase 185,430,464 Shares of Common Stock AND Pre-funded Warrants to Purchase 138,930,464 Shares of Common Stock UNDERWRITING AGREEMENT March 19, 2025 Oppenheimer & Co. Inc. As representative of the several underwriters named in Schedule I hereto c/o Oppenheimer & Co. Inc. 85 Broad Street New Yor

March 20, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 19, 2025 Plug Power Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 19, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incor

March 20, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

March 20, 2025 EX-4.2

Form of Pre-Funded Warrant.

EX-4.2 4 tm259816d1ex4-2.htm EXHIBIT 4.2 Exhibit 4.2 FORM OF PRE-FUNDED WARRANT Plug Power Inc. Pre-Funded Warrant To Purchase Common Stock Warrant No.: Number of Shares of Common Stock: Date of Issuance: March [20], 2025 (“Issuance Date”) Plug Power Inc., a company organized under the laws of State of Delaware (the “Company”), hereby certifies that, for good and valuable consideration, the receip

March 19, 2025 FWP

Plug Power Inc. Shares of Common Stock Pre-funded Warrants to Purchase Shares of Common Stock

Issuer Free Writing Prospectus dated March 19, 2025 Filed Pursuant to Rule 433 Registration No.

March 19, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, par value $0.

March 19, 2025 424B5

PLUG POWER INC. 46,500,000 Common Stock Pre-funded Warrants to Purchase 138,930,464 Shares of Common Stock Warrants to Purchase 185,430,464 Shares of Common Stock

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(5)  Registration No. 333-265488 Prospectus Supplement (To Prospectus dated June 8, 2022) PLUG POWER INC. 46,500,000 Common Stock Pre-funded Warrants to Purchase 138,930,464 Shares of Common Stock Warrants to Purchase 185,430,464 Shares of Common Stock We are offering 46,500,000 shares of our common stock, par value $0.01 per share. Each share of com

March 3, 2025 EX-19.1

Plug Power Inc. Insider Trading Policy

Exhibit 19.1 PROCEDURES AND GUIDELINES GOVERNING SECURITIES TRADES BY INSIDERS Date Revised November 7, 2024 Revision # 15 Department Legal Department PLUG POWER INC. PROCEDURES AND GUIDELINES GOVERNING SECURITIES TRADES BY INSIDERS (“Insider Trading Policy”) Approved November 7, 2024 I.PURPOSE Plug Power Inc., along with its subsidiaries or affiliates (the “Company”) seeks to prevent the misuse o

March 3, 2025 10-K

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT For the transition period from to Commission file number: 1-34392 Plug Powe

March 3, 2025 EX-10.13

Form of Non-Qualified Stock Option Agreement for Non-Employee Directors

Exhibit 10.13 NON-QUALIFIED STOCK OPTION AGREEMENT FOR NON-EMPLOYEE DIRECTORS UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Optionee: No. of Option Shares: Option Exercise Price per Share: $ [FMV on Grant Date] Grant Date: Expiration Date: [No more than 10 years] Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date hereof (the “

March 3, 2025 EX-10.6

Executive Employment Agreement, dated as of September 10, 2018, between Timothy Cortes and Plug Power Inc.

Exhibit 10.6 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of the 10th day of September, 2018 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Timothy Cortes (the “Executive”). WHEREAS, the Executive and the Company have determined to enter into an agreement related to the employment of Executive by the Company; NOW

March 3, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 3, 2025 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 3, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

March 3, 2025 EX-10.15

Form of Restricted Stock Award Agreement for Company Employees

Exhibit 10.15 RESTRICTED STOCK AWARD AGREEMENT FOR COMPANY EMPLOYEES UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Grantee: No. of Shares: Grant Date: Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date hereof (the “Plan”), Plug Power Inc. (the “Company”) hereby grants a Restricted Stock Award (an “Award”) to the Grantee named

March 3, 2025 EX-10.16

Form of Restricted Stock Award Agreement for Non-Employee Directors

Exhibit 10.16 RESTRICTED STOCK AWARD AGREEMENT FOR NON-EMPLOYEE DIRECTORS UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Grantee: No. of Shares: Grant Date: Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date hereof (the “Plan”), Plug Power Inc. (the “Company”) hereby grants a Restricted Stock Award (an “Award”) to the Grantee n

March 3, 2025 EX-10.12

Form of Non-Qualified Stock Option Agreement for Company Employees

Exhibit 10.12 NON-QUALIFIED STOCK OPTION AGREEMENT FOR COMPANY EMPLOYEES UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Optionee: No. of Option Shares: Option Exercise Price per Share: $ [FMV on Grant Date] Grant Date: Expiration Date: [No more than 10 years] Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date hereof (the “Plan”

March 3, 2025 EX-4.10

Convertible Debenture dated November 12, 2024

Exhibit 4.10 NEITHER THIS DEBENTURE NOR THE SECURITIES INTO WHICH THE DEBENTURE IS CONVERTIBLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE. THESE SECURITIES HAVE BEEN SOLD IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXC

March 3, 2025 EX-10.14

Form of Non-Qualified Stock Option Agreement for Non-U.S. Optionees

Exhibit 10.14 NON-QUALIFIED STOCK OPTION AGREEMENT FOR NON-U.S. OPTIONEES UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Optionee: No. of Option Shares: Option Exercise Price per Share: US$ [Fair Market Value on Grant Date] Grant Date: Expiration Date: [No more than 10 years] Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date h

March 3, 2025 EX-10.7

Executive Employment Agreement, dated as of November 19, 2024, between Paul B. Middleton and Plug Power Inc.

Exhibit 10.7 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of the 19th day of November, 2024 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Paul B. Middleton (the “Executive” and, together with the Company, the “Parties”). WHEREAS, the Executive and the Company are parties to an Executive Employment Agreement by a

March 3, 2025 EX-10.17

Form of Restricted Stock Unit Award Agreement for Non-U.S. Grantees

Exhibit 10.17 RESTRICTED STOCK UNIT AWARD AGREEMENT FOR NON-U.S. GRANTEES UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Grantee: No. of Restricted Stock Units: Grant Date: Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date hereof (the “Plan”), and this Restricted Stock Unit Award Agreement for Non-U.S. Grantees, including any

March 3, 2025 EX-21.1

List of Subsidiaries of Plug Power Inc.

Exhibit 21.1 Plug Power Inc. Subsidiaries Below is a list of Plug Power Inc.’s wholly owned subsidiaries. The names of certain subsidiaries have been omitted because, considered in the aggregate as a single subsidiary, they would not constitute, as of December 31, 2024, a “significant subsidiary” as that term is defined in Rule 1-02(w) of Regulation S-X. Plug Power Europe SAS Plug Power Hydrogen H

March 3, 2025 EX-99.1

Plug Power Announces Continued Cash Flow Improvement and Progress on Path to Profitability

Exhibit 99.1 Plug Power Announces Continued Cash Flow Improvement and Progress on Path to Profitability SLINGERLANDS, N.Y., March 3, 2025 — Plug Power Inc. (NASDAQ: PLUG), a global leader in the hydrogen economy, today provided an update on its strategic and operational progress and path to profitability. This past year of 2024 marked a pivotal commercial inflection point for Plug as the Company a

February 10, 2025 EX-10.1

Standby Equity Purchase Agreement, dated February 10, 2025, between Plug Power Inc. and YA II PN, LTD.

Exhibit 10.1 PLUG POWER INC. Common Stock (par value $0.01 per share) Standby Equity Purchase Agreement February 10, 2025 YA II PN, Ltd. 1012 Springfield Avenue Mountainside, NJ 07092 Ladies and Gentlemen: Plug Power Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”) with YA II PN, Ltd. (“Investor”) as follows: 1.           Issuance and Sale of Shares. The Comp

February 10, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 10, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 10, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

January 23, 2025 EX-10.2

Future Advance Promissory Note of Plug Power Energy Loan Borrower LLC, dated January 16, 2025.

Exhibit 10.2 DOE (Title XVII) PLUG POWER ENERGY LOAN BORROWER LLC FOR FFB USE ONLY Note Date January 16, 2025 Note Identifier: Place PLUGPOWR 0001 of Issue Washington, DC Purchase Date: Last Day for an January 16, 2025 Advance (3) March 5, 2028 Maximum Principal Maturity Amount (4) $387,598,647.06 Date (5) March 5, 2038 Payment March 5, June 5, First Dates September 5 & Interest December 5 Payment

January 23, 2025 EX-10.1

Note Purchase Agreement, dated January 16, 2025, by and among Plug Power Energy Loan Borrower LLC, the U.S. Department of Energy, and the Federal Financing Bank.

Exhibit 10.1 DOE (Title XVII) PLUG POWER ENERGY LOAN BORROWER LLC NOTE PURCHASE AGREEMENT made as of January 16, 2025, by and among the FEDERAL FINANCING BANK ("FFB"), a body corporate and instrumentality of the United States of America, PLUG POWER ENERGY LOAN BORROWER LLC (the "Borrower"), a limited liability company duly organized and existing under the laws of the State of Delaware, and the SEC

January 23, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 16, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 16, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

January 23, 2025 EX-10.3

Loan Guarantee Agreement, dated January 16, 2025, by and between Plug Power Energy Loan Borrower LLC, Plug Power Limestone, LLC, and the U.S. Department of Energy.

Exhibit 10.3 Execution Version CERTAIN INFORMATION IN THIS EXHIBIT MARKED [*] HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS BOTH (A) NOT MATERIAL AND (B) THE TYPE OF INFORMATION THAT THE COMPANY CUSTOMARILY AND ACTUALLY TREATS AS PRIVATE AND CONFIDENTIAL. LOAN GUARANTEE AGREEMENT dated as of January 16, 2025 among PLUG POWER ENERGY LOAN BORROWER LLC, as Borrower, U.S. DEPARTMENT OF ENERGY, as

January 16, 2025 EX-99.1

Plug Closes Loan Guarantee from the U.S. Department of Energy Loan guarantee supports Plug’s domestic hydrogen production plant buildout Plug’s Graham, Texas, plant first beneficiary of loan guarantee

Exhibit 99.1 FOR IMMEDIATE RELEASE Plug Closes Loan Guarantee from the U.S. Department of Energy Loan guarantee supports Plug’s domestic hydrogen production plant buildout Plug’s Graham, Texas, plant first beneficiary of loan guarantee SLINGERLANDS, N.Y., JAN. 16, 2025 – Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, closed a $1.

January 16, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 16, 2025 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 16, 2025 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

November 26, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 26, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 26, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 26, 2024 EX-99.1

Plug to Participate in the Jefferies Renewables & Clean Energy Conference 2024

Exhibit 99.1 Plug to Participate in the Jefferies Renewables & Clean Energy Conference 2024 SLINGERLANDS, N.Y., November 26, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, announced that it will be featured as a presenting company at the Jefferies Renewables & Clean Energy Conference 2024 in New York. Jose Luis Crespo, Chi

November 25, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 19, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 19, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 13, 2024 EX-99.2

Plug Power Hosts 2024 Plug Symposium With the theme "Plug Doing Real Things," the event highlights how Plug is laying the groundwork for the next five years Plug targets ~30% CAGR for Energy and Applications businesses from 2025 to 2030 and appoints

Exhibit 99.2 Plug Power Hosts 2024 Plug Symposium With the theme "Plug Doing Real Things," the event highlights how Plug is laying the groundwork for the next five years Plug targets ~30% CAGR for Energy and Applications businesses from 2025 to 2030 and appoints Sanjay Shrestha new President SLINGERLANDS, N.Y., Nov. 13, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in hydrogen solutions f

November 13, 2024 EX-99.1

Copyright 2024, Plug Power Inc. Symposium 2024: Plug Doing Real Things Andy Marsh, CEO November 13, 2024 2 Safe Harbor Customers Infrastructure 3 Plug is Uniquely Positioned to Capture the Market 4 Plug is Uniquely Positioned to Support the Full Ecos

Exhibit 99.1 Copyright 2024, Plug Power Inc. Symposium 2024: Plug Doing Real Things Andy Marsh, CEO November 13, 2024 2 Safe Harbor Customers Infrastructure 3 Plug is Uniquely Positioned to Capture the Market 4 Plug is Uniquely Positioned to Support the Full Ecosystem 5 Plug is Uniquely Positioned with the Right People & Experience 6 It has been tough, but the capabilities are here for the future.

November 13, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 13, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 13, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 12, 2024 EX-10.2

Debenture Purchase Agreement, dated November 11, 2024, by and between Plug Power Inc. and YA II PN, Ltd. (filed as Exhibit 10.2 to Plug Power Inc.’s Quarterly Report on Form 10-Q filed November 12, 2024 and incorporated by reference herein)

Exhibit 10.2 DEBENTURE PURCHASE AGREEMENT THIS DEBENTURE PURCHASE AGREEMENT (this “Agreement”), dated as of November 11, 2024, is between PLUG POWER INC., a company incorporated under the laws of the State of Delaware, with principal executive offices located at 125 Vista Boulevard, Slingerlands, New York 12159 (the “Company”), and YA II PN, Ltd., a Cayman Islands exempt limited company (the “Buye

November 12, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Num

November 12, 2024 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 11, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 12, 2024 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Convertible into Equity Common Stock, par value $0.

November 12, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 12, 2024 EX-99.1

Plug Power Announces Key Strategic Milestones and Continued Margin Improvement in Third Quarter 2024

Exhibit 99.1 Plug Power Announces Key Strategic Milestones and Continued Margin Improvement in Third Quarter 2024 SLINGERLANDS, N.Y., November 12, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, today announced further progress on its strategic and operational initiatives and path to profitability in the third quarter of 20

November 12, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

November 12, 2024 424B7

PLUG POWER INC. Up to 125,000,000 Shares of Common Stock Offered by the Selling Stockholder

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(7)  Registration No. 333-265488 Prospectus Supplement (To Prospectus dated June 8, 2022) PLUG POWER INC. Up to 125,000,000 Shares of Common Stock Offered by the Selling Stockholder This prospectus supplement relates to the potential resale by the selling stockholder identified herein of up to 125,000,000 shares of our common stock issuable in connec

November 8, 2024 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 PLUG POWER INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, par value $0.

November 8, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

November 8, 2024 424B5

$1,000,000,000 Common Stock

 Filed Pursuant to Rule 424(b)(5)  Registration No. 333-265488 PROSPECTUS SUPPLEMENT NO. 2 (To Prospectus dated June 8, 2022 and Prospectus Supplement dated January 17, 2024 and Prospectus Supplement No. 1 dated February 23, 2024) $1,000,000,000 Common Stock This prospectus supplement no. 2 (this “prospectus supplement no. 2”) is being filed to update, amend and supplement certain information in t

November 8, 2024 EX-1.1

Amendment No. 2 to At Market Issuance Sales Agreement, dated November 7, 2024, by and between Plug Power Inc. and B. Riley Securities, Inc. (filed as Exhibit 1.1 to Plug Power Inc.’s Current Report on Form 8-K filed on November 8, 2024 and incorporated by reference herein)

Exhibit 1.1 AMENDMENT NO. 2 TO AT MARKET ISSUANCE SALES AGREEMENT November 7, 2024 B. Riley Securities, Inc. 299 Park Avenue, 21st Floor New York, NY 10171 Ladies and Gentlemen: Plug Power Inc., a Delaware corporation (the “Company”), and B. Riley Securities, Inc. (the “Agent”), are parties to that certain At Market Issuance Sales Agreement dated January 17, 2024 (the “Original Agreement”), as ame

November 7, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

November 7, 2024 EX-99.1

PLUG TO BROADCAST 2024 PLUG SYMPOSIUM ON NOVEMBER 13, 2024 Public Registration Open for Digital Event

Exhibit 99.1 PLUG TO BROADCAST 2024 PLUG SYMPOSIUM ON NOVEMBER 13, 2024 Public Registration Open for Digital Event Slingerlands, N.Y., November 7, 2024 - Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, invites the public to join the 2024 Plug Symposium, streaming live on November 13, 2024. The event, themed Plug Doing Real Things,

November 6, 2024 SC 13D/A

PLUG / Plug Power Inc. / Grove Energy Capital LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* Plug Power Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 72919P202 (CUSIP Number) Wonsang Cho SK Inc. (formerly known as SK Holdings Co., Ltd.) 26, Jong-ro, Jongno-gu Seoul, The Republic of Korea Tel: +82-2-

October 10, 2024 SC 13G

PLUG / Plug Power Inc. / NORGES BANK Passive Investment

SC 13G 1 efc24-0930formsc13g.txt UNITED STATES SECURITIES EXCHANGE COMMISSION Washington, D.C. 20549 - SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.)* Plug Power Inc. - (Name of Issuer) Common Stock - (Title of Class of Securities) 72919P103 - (CUSIP Number) September 30, 2024 - (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate t

October 7, 2024 LETTER

LETTER

October 7, 2024 Paul B. Middleton Chief Financial Officer Plug Power Inc. 125 Vista Boulevard Slingerlands, NY 12159 Re: Plug Power Inc. Form 10-K for the Fiscal Year Ended December 31, 2023 File No. 001-34392 Dear Paul B. Middleton: We have completed our review of your filing. We remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, not

October 3, 2024 CORRESP

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October 3, 2024 Ms. Beverly Singleton Mr. Andrew Blume Office of Manufacturing Division of Corporation Finance Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 RE: Plug Power Inc. Form 10-K for Fiscal Year Ended December 31, 2023 Form 10-Q for the Quarterly Period Ended June 30, 2024 Response dated September 11, 2024 File No. 001-34392 Dear Ms. Singleton and Mr. Blume:

September 26, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 26, 2024 Plug Power Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 26, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of in

September 26, 2024 EX-99.1

Plug to Participate in the Wolfe Research Utilities, Midstream & Clean Energy Conference 2024

Exhibit 99.1 Plug to Participate in the Wolfe Research Utilities, Midstream & Clean Energy Conference 2024 SLINGERLANDS, N.Y., September 26, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, announced that it will be featured as a presenting company at the Wolfe Research Utilities, Midstream & Clean Energy Conference 2024 in

September 23, 2024 LETTER

LETTER

September 23, 2024 Paul B. Middleton Chief Financial Officer Plug Power Inc. 125 Vista Boulevard Slingerlands, NY 12159 Re: Plug Power Inc. Form 10-K for the Fiscal Year Ended December 31, 2023 Form 10-Q for the Quarterly Period Ended June 30, 2024 Response dated September 11, 2024 File No. 001-34392 Dear Paul B. Middleton: We have reviewed your September 11, 2024 response to our comment letter an

September 11, 2024 CORRESP

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September 11, 2024 Ms. Beverly Singleton Mr. Andrew Blume Office of Manufacturing Division of Corporation Finance Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 RE: Plug Power Inc. Form 10-K for Fiscal Year Ended December 31, 2023 Form 10-Q for the Quarterly Period Ended June 30, 2024 File No. 001-34392 Dear Ms. Singleton and Mr. Blume: This letter is being submitted

September 9, 2024 EX-99.1

Plug Announces Participation at the H.C. Wainwright 26th Annual Global Investment Conference

Exhibit 99.1 Plug Announces Participation at the H.C. Wainwright 26th Annual Global Investment Conference SLINGERLANDS, N.Y., September 9, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, today announced that it will be featured as a presenting company at the H.C. Wainwright 26th Annual Global Investment Conference in New Yo

September 9, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 9, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 9, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

September 5, 2024 EX-99.1

Plug Power Announces Completion of Undertakings Related to 2023 SEC Settlement

Exhibit 99.1 Plug Power Announces Completion of Undertakings Related to 2023 SEC Settlement SLINGERLANDS, N.Y., September 5, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, is pleased to announce that it has complied with and completed the undertakings in connection with its previously announced settlement of a civil admini

September 5, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 30, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 30, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

August 27, 2024 LETTER

LETTER

August 27, 2024 Paul B. Middleton Chief Financial Officer Plug Power Inc. 125 Vista Boulevard Slingerlands, NY 12159 Re: Plug Power Inc. Form 10-K for the Fiscal Year Ended December 31, 2023 Form 10-Q for the Quarterly Period Ended June 30, 2024 File No. 001-34392 Dear Paul B. Middleton: We have limited our review of your filing to the financial statements and related disclosures and have the foll

August 22, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 16, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 16, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inco

August 22, 2024 EX-99.1

Plug Power Appoints Colin Angle, Former CEO of iRobot, to Board of Directors

Exhibit 99.1 Plug Power Appoints Colin Angle, Former CEO of iRobot, to Board of Directors SLINGERLANDS, N.Y., August 22, 2024 – Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, today announced the appointment of Colin Angle, former CEO of iRobot, to its Board of Directors. Mr. Angle brings decades of extensive experience in technol

August 8, 2024 EX-10.9

Assignment and Modification of Ground Lease Premises 2, dated November 1, 2023, Campus Associates XI LLC, Vista Development Group, LLC and Plug Power Inc.

Exhibit 10.9 ASSIGNMENT AND MODIFICATION OF GROUND LEASE PREMISES 2 THIS ASSIGNMENT AND MODIFICATION OF GROUND LEASE PREMISES 2 (this “Assignment”) dated November 1, 2023, is made by and between Campus Associates XI LLC, a New York limited liability company with an address at 302 Washington Avenue Extension, Albany, New York (“Campus Associates”), Vista Development Group, LLC a New York limited li

August 8, 2024 EX-10.6

Sublease Agreement, dated December 15, 2021, by and between Vista Real Estate Development LLC and Plug Power Inc.

Exhibit 10.6 SUBLEASE AGREEMENT VISTA REAL ESTATE DEVELOPMENT LLC LANDLORD and PLUG POWER, INC. TENANT For a portion of the premises located at 125 Vista Boulevard, Town of Bethlehem, County of Albany, State of New York TABLE OF CONTENTS LIST OF EXHIBITS EXHIBIT A - Site Plan A-1 EXHIBIT B - Fee Owner Recognition Agreement B-1 EXHIBIT C -Lease Commencement Agreement C-1 EXHIBIT D-Plans and Specifi

August 8, 2024 EX-10.8

Second Amendment to Sublease Agreement, dated February 14, 2024, by and between Campus Associates XII LLC and Plug Power Inc.

Exhibit 10.8 SECOND AMENDMENT TO SUBLEASE AGREEMENT SECOND AMENDMENT TO SUBLEASE AGREEMENT (“Amendment”), made as of the 14th day of February, 2024, by and between Campus Associates XII LLC, having its principal office at 302 Washington Avenue Extension, Albany, New York 12203 (“Landlord”) and Plug Power Inc. having its principal office at 968 Albany Shaker Road, Latham, New York 12110 (“Tenant”).

August 8, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2024 Plug Power Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorp

August 8, 2024 EX-99.1

Plug Power Announces Key Developments and Strategic Milestones in Second Quarter 2024

Exhibit 99.1 Plug Power Announces Key Developments and Strategic Milestones in Second Quarter 2024 SLINGERLANDS, N.Y., August 8, 2024 — Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, today announced significant progress and strategic initiatives in the second quarter of 2024. These developments underscore the Company's commitment

August 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number:

August 8, 2024 EX-10.4

Rules of the Plug Power Inc. 2021 Stock Option and Incentive Plan for Awards Granted to Participants in France

Exhibit 10.4 RULES OF THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN FOR AWARDS GRANTED TO PARTICIPANTS IN FRANCE I.GENERAL. 1.Introduction. The Board of Directors (the “Board”) of Plug Power Inc. (the “Company”) has established the Plug Power Inc. 2021 Stock Option and Incentive Plan (the “U.S. Plan”) for the benefit of certain eligible persons, including employees of the Company and it

August 8, 2024 EX-10.1

Relocation and Retention Agreement, dated as of May 10, 2024, between Sanjay Shrestha and Plug Power Inc. (filed as Exhibit 10.1 to Plug Power Inc.’s Quarterly Report on Form 10-Q filed on August 8, 2024 and incorporated by reference herein)

Exhibit 10.1 RELOCATION AND RETENTION AGREEMENT This Agreement is made as of May 10, 2024, by and between Plug Power Inc. (“Employer”), and Sanjay Shrestha, an individual employed by Employer (“Employee”). R E C I T A L S WHEREAS, Employer desires to encourage the Employee to relocate his primary residence closer to Employer’s office location in Latham, New York to promote more efficient communica

August 8, 2024 EX-10.5

Form of Restricted Stock Unit Award Agreement for Non-U.S. Grantees

Exhibit 10.5 RESTRICTED STOCK UNIT AWARD AGREEMENT FOR NON-U.S. GRANTEES UNDER THE PLUG POWER INC. 2021 STOCK OPTION AND INCENTIVE PLAN Name of Grantee: No. of Restricted Stock Units: Grant Date: Pursuant to the Plug Power Inc. 2021 Stock Option and Incentive Plan, as amended through the date hereof (the “Plan”), and this Restricted Stock Unit Award Agreement for Non-U.S. Grantees, including any a

August 8, 2024 EX-10.7

First Amendment to Sublease Agreement, dated May 26, 2022, by and between Campus Associates XII LLC and Plug Power Inc.

Exhibit 10.7 FIRST AMENDMENT TO SUBLEASE AGREEMENT FIRST AMENDMENT TO SUBLEASE AGREEMENT (“Amendment”), made as of the 26th day of May, 2022, by and between Campus Associates XII LLC, having its principal office at 302 Washington Avenue Extension, Albany, New York 12203 (“Landlord”) and Plug Power, Inc. a New York corporation with an address at 968 Albany Shaker Road, Latham, New York 12110 (“Tena

August 2, 2024 EX-10.2

Executive Employment Agreement, dated as of July 29, 2024, between Dean Fullerton and Plug Power Inc. (filed as Exhibit 10.2 to Plug Power Inc.’s Current Report on Form 8-K filed on August 2, 2024 and incorporated by reference herein)

Exhibit 10.2 EXECUTIVE EMPLOYMENT AGREEMENT This Employment Agreement (“Agreement”) is made as of July 29, 2024 (the “Commencement Date”), between Plug Power Inc., a Delaware corporation (the “Company”), and Dean Fullerton (the “Executive”). WHEREAS, the Executive and the Company have determined to enter into an agreement related to the employment of Executive by the Company; NOW, THEREFORE, in co

August 2, 2024 EX-10.1

Offer Letter, dated July 27, 2024

Exhibit 10.1 July 27, 2024 Dean Fullerton Dear Dean, It is my pleasure to confirm Plug Power Inc.’s (the “Company”) offer of employment for the position of Chief Operating Officer - reporting to Andy Marsh (President and Chief Executive Officer). If you accept this offer, the official start date of your employment is July 29th, 2024. The key elements of this package include: 1) A weekly base salar

August 2, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2024 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

July 22, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

July 22, 2024 EX-1.1

Underwriting Agreement, dated July 18, 2024, by and among Plug Power Inc., and Morgan Stanley & Co. LLC, as representative of the several underwriters named in Schedule I thereto

  Exhibit 1.1   78,740,157 Shares   PLUG POWER INC.   COMMON STOCK, par value $0.01 per share   UNDERWRITING AGREEMENT   July 18, 2024         July 18, 2024   Morgan Stanley & Co. LLC   As representative of the several underwriters named in Schedule I hereto   c/o Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036   Ladies and Gentlemen:   Plug Power Inc., a Delaware corporation (the

July 19, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form 424(b)(5) (Form Type) Plug Power Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table Form 424(b)(5) (Form Type) Plug Power Inc.

July 19, 2024 424B5

78,740,157 Shares PLUG POWER INC. Common Stock

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(5)  Registration No. 333-265488 Prospectus Supplement (To Prospectus dated June 8, 2022) 78,740,157 Shares PLUG POWER INC. Common Stock We are offering up to 78,740,157 Shares of our common stock in this offering. Our common stock is traded on the Nasdaq Capital Market under the symbol “PLUG.” On July 17, 2024, the last reported sale price of our co

July 18, 2024 424B5

$200,000,000 PLUG POWER INC. Common Stock

TABLE OF CONTENTS The information in this preliminary prospectus supplement and the accompanying prospectus is not complete and may be changed.

July 18, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

June 7, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported):June 5, 2024 Plug Power Inc. (Exac

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported):June 5, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpora

June 5, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2024 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

June 5, 2024 EX-99.1

Copyright 202 2 , Plug Power Inc. Plug Power NASDAQ: PLUG Copyright 2023, Plug Power Inc .

Exhibit 99.1 Copyright 202 2 , Plug Power Inc. Plug Power NASDAQ: PLUG Copyright 2023, Plug Power Inc . 2 This presentation and the accompanying oral presentation contain “forward - looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We intend such forward - looking statements to be cov

May 24, 2024 424B7

PLUG POWER INC. 3,461,371 Shares of Common Stock Offered by the Selling Stockholders

TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(7)  Registration No. 333-265488 Prospectus Supplement (To Prospectus dated June 8, 2022) PLUG POWER INC. 3,461,371 Shares of Common Stock Offered by the Selling Stockholders This prospectus supplement relates to the potential resale from time to time of some or all of the 3,461,371 shares of our common stock, par value $0.01 per share (the “common s

May 24, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form 424(b)(7) (Form Type) Plug Power Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table Form 424(b)(7) (Form Type) Plug Power Inc.

May 24, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 24, 2024 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 24, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

May 15, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Plug Power Inc. (Exac

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpora

May 14, 2024 EX-99.1

PLUG RECEIVES $1.66 BILLION CONDITIONAL COMMITMENT LOAN GUARANTEE FROM DEPARTMENT OF ENERGY FOR GREEN HYDROGEN DEVELOPMENT PIPELINE Loan guarantee will bolster the buildout of Plug’s green hydrogen plant network across the United States, driving rapi

Exhibit 99.1 PLUG RECEIVES $1.66 BILLION CONDITIONAL COMMITMENT LOAN GUARANTEE FROM DEPARTMENT OF ENERGY FOR GREEN HYDROGEN DEVELOPMENT PIPELINE Loan guarantee will bolster the buildout of Plug’s green hydrogen plant network across the United States, driving rapid advancement of the hydrogen economy LATHAM, N.Y., May 14, 2024 - Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydro

May 14, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 14, 2024 Plug Power Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 14, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpor

May 9, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Plug Power Inc. (Exac

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpora

May 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents . UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number:

May 9, 2024 EX-99.2

Copyright 202 2 , Plug Power Inc. Plug Power NASDAQ: PLUG Copyright 2024, Plug Power Inc .

Exhibit 99.2 Copyright 202 2 , Plug Power Inc. Plug Power NASDAQ: PLUG Copyright 2024, Plug Power Inc . 2 This presentation contains “forward - looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 that involve significant risks and uncertainties about Plug Power Inc . (“Plug”), including but not limited to statements about Plug’s projections regarding its

May 9, 2024 EX-99.1

Plug Announces First Quarter 2024 Financial Results

Exhibit 99.1 Plug Announces First Quarter 2024 Financial Results LATHAM, N.Y., May 9, 2024 — Plug Power Inc. (NASDAQ: PLUG) (the “Company”), a global leader in comprehensive hydrogen solutions for the green hydrogen economy, announced its financial results and operational milestones for the first quarter of 2024. First-Quarter Results ● Earnings-Per-Share (EPS) and Revenue: The Company reported re

April 26, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2024 Plug Power Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorp

April 26, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Ru

April 26, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨

April 26, 2024 ARS

ARS

2023 ANNUAL REPORT TO STOCKHOLDERS Letter From Our Chief Executive Officer April 26, 2024 Dear Fellow Stockholder, For more than 25 years, Plug Power Inc.

April 26, 2024 EX-3.1

Seventh Amended and Restated By-laws of Plug Power Inc. (filed as Exhibit 3.1 to Plug Power Inc.’s Current Report on Form 8-K filed on April 26, 2024 and incorporated by reference herein)

Exhibit 3.1 SEVENTH AMENDED AND RESTATED BY-LAWS OF PLUG POWER INC. (the “Corporation”) Adopted by the Board of Directors on 24th of April, 2024 Article I Stockholders SECTION 1. Annual Meeting. The annual meeting of stockholders (any such meeting being referred to in these By-laws as an “Annual Meeting”) shall be held at the hour, date and place within or without the United States that is fixed b

March 26, 2024 EX-4.1

Indenture, dated as of March 20, 2024, between Plug Power Inc. and Wilmington Trust, National Association, as Trustee (filed as Exhibit 4.1 to Plug Power Inc.’s Current Report on Form 8-K filed on March 26, 2024 and incorporated by reference herein)

Exhibit 4.1 Execution Version PLUG POWER INC. AND WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee INDENTURE Dated as of March 20, 2024 7.00% Convertible Senior Notes due 2026 TABLE OF CONTENTS Page Article 1 Definitions Section 1.01 . Definitions 1 Section 1.02 . References to Interest 14 Article 2 Issue, Description, Execution, Registration and Exchange of Notes Section 2.01 . Designation and

March 26, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 20, 2024 Plug Power Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 20, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorp

March 13, 2024 EX-99.1

[Signature Pages Follow]

Exhibit 99.1 Form of Exchange Agreement Execution Version March 12, 2024 Plug Power Inc. 968 Albany Shaker Road Latham, New York 12110 Attention: General Counsel Re: Exchange for Plug Power Inc.’s 3.75% Convertible Senior Notes due 2025 Ladies and Gentlemen: Pursuant to the terms of this exchange agreement (this “Exchange Agreement”), Plug Power Inc., a Delaware corporation (the “Company”), is off

March 13, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 12, 2024 Plug Power Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 12, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorp

March 4, 2024 EX-99.1

Plug Power Fourth Quarter 2023 Earnings March 1, 2024

Exhibit 99.1 Plug Power Fourth Quarter 2023 Earnings March 1, 2024 Presenters Andy Marsh, CEO Paul Middleton, CFO Meryl Fritz, Marketing and Communications Manager Sanjay Shrestha, Chief Strategy Officer Q&A Participants James West – Evercore ISI Manav Gupta – UBS Craig Irwin – ROTH MKM Bill Peterson – J.P. Morgan George Gianarikas – Canaccord Genuity Skye Landon – Redburn Atlantic Eric Stine – Cr

March 4, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2024 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

March 1, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2024 Plug Power Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of incorpo

March 1, 2024 EX-99.1

Highlights Year of Strategic Growth and Advancements in Accelerating the Green Hydrogen Economy

Exhibit 99.1 Plug Highlights Year of Strategic Growth and Advancements in Accelerating the Green Hydrogen Economy LATHAM, N.Y., Mar. 1, 2024 – Today, Plug Power Inc. (NASDAQ: PLUG), a global leader in comprehensive hydrogen solutions for the green hydrogen economy announced its financial results and operational milestones for the quarter and fiscal year ended December 31, 2023. With a steadfast co

February 29, 2024 EX-21.1

List of Subsidiaries of Plug Power Inc.

Exhibit 21.1 Plug Power Inc. Subsidiaries Below is a list of Plug Power Inc.’s wholly owned subsidiaries. The names of certain subsidiaries have been omitted because, considered in the aggregate as a single subsidiary, they would not constitute, as of December 31, 2023, a “significant subsidiary” as that term is defined in Rule 1-02(w) of Regulation S-X. Plug Power Hydrogen Holdings, Inc. (incorpo

February 29, 2024 EX-3.9

Sixth Amended and Restated Bylaws of Plug Power Inc.

Exhibit 3.9 SIXTH AMENDED AND RESTATED BY-LAWS OF PLUG POWER INC. (the “Corporation”) Adopted by the Board of Directors on 28th of February, 2024 Article I Stockholders SECTION 1.Annual Meeting. The annual meeting of stockholders (any such meeting being referred to in these By-laws as an “Annual Meeting”) shall be held at the hour, date and place within or without the United States that is fixed b

February 29, 2024 EX-97

Compensation Recovery Policy, adopted as of November 30, 2023

Exhibit 97 PLUG POWER INC. COMPENSATION RECOVERY POLICY Adopted as of November 30, 2023 Plug Power Inc., a Delaware corporation (the “Company”), has adopted a Compensation Recovery Policy (this “Policy”) as described below. This Policy is effective as of October 2, 2023 (the “Effective Date”) and replaces, effective as of that date, the Company’s Policy for Recoupment of Incentive Compensation ado

February 29, 2024 10-K

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT For the transition period from to Commission file number: 1-34392 Plug Powe

February 29, 2024 EX-4.7

Exhibit 4.7

Exhibit 4.7 PLUG POWER INC. DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Plug Power, Inc., a Delaware corporation, has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, referred to herein as the Exchange Act: common stock, par value $0.01 per share, referred to herein as the Common Sto

February 23, 2024 424B5

$1,000,000,000 Common Stock

 Filed Pursuant to Rule 424(b)(5)  Registration No. 333-265488 PROSPECTUS SUPPLEMENT NO. 1 (To prospectus supplement dated January 17, 2024 and accompanying prospectus dated June 8, 2022) $1,000,000,000 Common Stock This prospectus supplement no. 1 (this “prospectus supplement”) is being filed to update, amend and supplement certain information in the prospectus supplement, dated and filed with th

February 23, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2024 Plug Power Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2024 Plug Power Inc. (Exact name of registrant as specified in its charter) Delaware 1-34392 22-3672377 (State or other jurisdiction (Commission File (IRS Employer of inc

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