Plug Power Inc.
CH ˙ SWX ˙ US72919P2020
SecurityCH:PLUG / Plug Power Inc.
InstitutionTwo Sigma Investments, Lp
ManagerJohn Overdeck, David Siegel
Latest Disclosed Ownership27,395,936 shares
Latest Disclosed Value $ 61,914,815
Two Sigma Investments, Lp ownership in PLUG / Plug Power Inc.

On May 15, 2026 - Two Sigma Investments, Lp filed a 13F-HR form disclosing ownership of 27,395,936 shares of Plug Power Inc. (CH:PLUG) valued at $61,914,815 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 28,371,995 shares of Plug Power Inc.. This represents a change in shares of -3.44% during the quarter.

Two Sigma Investments, Lp has a history of taking positions in derivatives of the underlying security (PLUG) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

CH:PLUG / Plug Power Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F PLUG PWR COM NEW 72919P202 27,395,936 -976,059 -3.44 61,915 10.77 0.0500
2026-02-17 2025-12-31 13F PLUG POWER COM NEW 72919P202 28,371,995 17,541,102 161.95 55,893 121.49 0.0788
2025-11-14 2025-09-30 13F PLUG POWER COM NEW 72919P202 10,830,893 8,068,713 292.11 25,236 513.24 0.0376
2025-08-14 2025-06-30 13F PLUG POWER COM NEW 72919P202 2,762,180 2,282,280 475.57 4,116 536.01 0.0073
2025-05-15 2025-03-31 13F PLUG POWER COM NEW 72919P202 479,900 -489,427 -50.49 648 -68.65 0.0014
2025-02-14 2024-12-31 13F PLUG POWER COM NEW 72919P202 969,327 770,564 387.68 2,065 359.69 0.0045
2024-11-14 2024-09-30 13F PLUG POWER COM NEW 72919P202 198,763 -115,273 -36.71 449 -38.58 0.0010
2024-08-14 2024-06-30 13F PLUG POWER COM NEW 72919P202 314,036 314,036 732 0.0017
2024-05-15 2024-03-31 13F PLUG POWER COM NEW 72919P202 0 -1,804,581 -100.00 0 -100.00
2024-02-14 2023-12-31 13F PLUG POWER COM NEW 72919P202 1,804,581 1,804,581 8,121 0.0187
2023-05-15 2023-03-31 13F PLUG POWER COM NEW 72919P202 0 -3,179,316 -100.00 0 -100.00
2023-02-14 2022-12-31 13F PLUG POWER COM NEW 72919P202 3,179,316 -277,322 -8.02 39,328 -45.85 0.1235
2022-11-14 2022-09-30 13F PLUG POWER COM NEW 72919P202 3,456,638 2,615,081 310.74 72,624 420.79 0.2468
2022-08-15 2022-06-30 13F PLUG POWER COM NEW 72919P202 841,557 645,612 329.49 13,945 148.75 0.0460
2022-05-16 2022-03-31 13F PLUG POWER COM NEW 72919P202 195,945 195,945 5,606 0.0165
2022-02-14 2021-12-31 13F PLUG POWER COM NEW 72919P202 0 -131,751 -100.00 0 -100.00
2021-11-15 2021-09-30 13F PLUG POWER COM NEW 72919P202 131,751 131,751 3,365 0.0075
2021-08-16 2021-06-30 13F PLUG POWER COM NEW 72919P202 0 -1,794,707 -100.00 0 -100.00
2021-05-17 2021-03-31 13F PLUG POWER COM NEW 72919P202 1,794,707 1,686,518 1,558.86 64,322 1,653.12 0.1673
2021-02-16 2020-12-31 13F PLUG POWER COM NEW 72919P202 108,189 -370,670 -77.41 3,669 -42.86 0.0105
2020-11-16 2020-09-30 13F PLUG POWER COM NEW 72919P202 478,859 -2,662,120 -84.75 6,421 -75.10 0.0228
2020-08-14 2020-06-30 13F PLUG POWER COM NEW 72919P202 3,140,979 2,304,929 275.69 25,787 771.18 0.1277
2020-05-15 2020-03-31 13F PLUG POWER COM NEW 72919P202 836,050 -1,077,209 -56.30 2,960 -51.04 0.0241
2020-02-14 2019-12-31 13F PLUG POWER COM NEW 72919P202 1,913,259 1,913,259 128.85 6,046 104.26 0.0182
2014-05-15 2014-03-31 13F PLUG POWER COM NEW 72919P202 0 -333,535 -100.00 0 -100.00
2014-02-14 2013-12-31 13F PLUG POWER COM NEW 72919P202 333,535 333,535 517 0.0029
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-05-16 2022-03-31 13F PLUG POWER COM NEW Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-14 2021-12-31 13F PLUG POWER COM NEW Call 120,300 -73.38 3,396 -70.58 n/a n/a n/a
2021-11-15 2021-09-30 13F PLUG POWER COM NEW Call 452,000 157.55 11,544 92.40 n/a n/a n/a
2021-08-16 2021-06-30 13F PLUG POWER COM NEW Call 175,500 104.07 6,000 94.68 n/a n/a n/a
2021-05-17 2021-03-31 13F PLUG POWER COM NEW Call 86,000 -5.49 3,082 -0.13 n/a n/a n/a
2021-02-16 2020-12-31 13F PLUG POWER COM NEW Call 91,000 55.82 3,086 294.13 n/a n/a n/a
2020-11-16 2020-09-30 13F PLUG POWER COM NEW Call 58,400 783 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-05-16 2022-03-31 13F PLUG POWER COM NEW Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-14 2021-12-31 13F PLUG POWER COM NEW Put 118,600 -83.30 3,348 -81.54 n/a n/a n/a
2021-11-15 2021-09-30 13F PLUG POWER COM NEW Put 710,000 276.46 18,133 181.22 n/a n/a n/a
2021-08-16 2021-06-30 13F PLUG POWER COM NEW Put 188,600 119.56 6,448 109.42 n/a n/a n/a
2021-05-17 2021-03-31 13F PLUG POWER COM NEW Put 85,900 -16.11 3,079 -11.32 n/a n/a n/a
2021-02-16 2020-12-31 13F PLUG POWER COM NEW Put 102,400 41.24 3,472 257.20 n/a n/a n/a
2020-11-16 2020-09-30 13F PLUG POWER COM NEW Put 72,500 972 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.