ADTRAN Holdings, Inc.
US ˙ NasdaqGS ˙ US00486H1059

SecurityADTN / ADTRAN Holdings, Inc.
InstitutionBarclays Plc
Latest Disclosed Ownership1,125,703 shares
Latest Disclosed Value $ 9,782,359
Barclays Plc reports 39.61% increase in ownership of ADTN / ADTRAN Holdings, Inc.

On February 13, 2026 - Barclays Plc filed a 13F-HR form disclosing ownership of 1,125,703 shares of ADTRAN Holdings, Inc. (US:ADTN) valued at $9,782,359 USD as of December 31, 2025. The entity filed a previous 13F-HR/A on March 31, 2026 disclosing 806,339 shares of ADTRAN Holdings, Inc.. This represents a change in shares of 39.61% during the quarter. The current value of the position is $19,440,891 USD.

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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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)
2026-02-13 2025-12-31 13F ADTRAN HOLDINGS COM 00486H105 1,125,703 319,364 39.61 9,782 29.34 0.0023
2026-03-31 2025-09-30 13F/A-3 ADTRAN HOLDINGS COM 00486H105 806,339 211,746 35.61 7,563 41.82 0.0016
2026-03-19 2025-09-30 13F/A-2 ADTRAN HOLDINGS COM 00486H105 115,741 -478,852 686 0.0002
2025-11-12 2025-09-30 13F ADTRAN HOLDINGS COM 00486H105 806,339 211,746 7,563 0.0016
2026-02-27 2025-06-30 13F/A-2 ADTRAN HOLDINGS COM 00486H105 594,593 136,660 29.84 5,334 33.56 0.0012
2025-08-14 2025-06-30 13F/A-1 ADTRAN HOLDINGS COM 00486H105 594,593 136,660 5 0.0012
2025-08-13 2025-06-30 13F ADTRAN HOLDINGS COM 00486H105 594,593 136,660 5 0.0004
2026-03-17 2025-03-31 13F/A-1 ADTRAN HOLDINGS COM 00486H105 457,933 186,119 68.47 3,993 76.37 0.0011
2025-05-15 2025-03-31 13F ADTRAN HOLDINGS COM 00486H105 457,933 186,119 4 0.0011
2026-03-19 2024-12-31 13F/A-1 ADTRAN HOLDINGS COM 00486H105 271,814 156,073 134.85 2,264 230.03 0.0006
2025-02-13 2024-12-31 13F ADTRAN HOLDINGS COM 00486H105 271,814 156,073 2 0.0006
2026-03-31 2024-09-30 13F/A-2 ADTRAN HOLDINGS COM 00486H105 115,741 11,880 11.44 686 25.64 0.0002
2024-11-19 2024-09-30 13F/A-1 ADTRAN HOLDINGS COM 00486H105 115,741 11,880 1 0.0002
2024-11-15 2024-09-30 13F ADTRAN HOLDINGS COM 00486H105 115,741 11,880 1 0.0001
2026-03-23 2024-06-30 13F/A-1 ADTRAN HOLDINGS COM 00486H105 103,861 416 0.40 546 -2.85 0.0002
2024-08-14 2024-06-30 13F ADTRAN HOLDINGS COM 00486H105 103,861 416 1 0.0002
2026-03-24 2024-03-31 13F/A-1 ADTRAN HOLDINGS COM 00486H105 103,445 -75,798 -42.29 563 -57.26 0.0002
2024-05-15 2024-03-31 13F ADTRAN HOLDINGS COM 00486H105 103,445 -75,798 1 0.0002
2026-03-25 2023-12-31 13F/A-1 ADTRAN HOLDINGS COM 00486H105 179,243 86,603 93.48 1,316 72.57 0.0005
2024-02-15 2023-12-31 13F ADTRAN HOLDINGS COM 00486H105 179,243 86,603 1 0.0005
2026-03-26 2023-09-30 13F/A-1 ADTRAN HOLDINGS COM 00486H105 92,640 43,461 88.37 762 47.39 0.0005
2023-11-07 2023-09-30 13F ADTRAN HOLDINGS COM 00486H105 92,640 43,461 1 0.0005
2026-03-30 2023-06-30 13F/A-2 ADTRAN HOLDINGS COM 00486H105 49,179 3,772 8.31 518 -28.19 0.0003
2023-09-20 2023-06-30 13F/A-1 ADTRAN HOLDINGS COM 00486H105 49,179 3,772 1 0.0003
2023-08-03 2023-06-30 13F ADTRAN HOLDINGS COM 00486H105 49,179 3,772 1 0.0003
2026-03-30 2023-03-31 13F/A-1 ADTRAN HOLDINGS COM 00486H105 45,407 7,030 18.32 720 -0.14 0.0003
2023-05-04 2023-03-31 13F ADTRAN HOLDINGS COM 00486H105 45,407 7,030 1 0.0003
2026-03-30 2022-12-31 13F/A-1 ADTRAN HOLDINGS COM 00486H105 38,377 17,874 87.18 721 79.80 0.0003
2023-02-13 2022-12-31 13F ADTRAN HOLDINGS COM 00486H105 38,377 17,874 1 0.0003
2022-11-03 2022-09-30 13F ADTRAN HOLDINGS COM 00486H105 20,503 20,503 401 0.0004
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.