Plug Power

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-25 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: PLUG POWER INC (PLUG) CIK: 0001093691 --- Reporting Owner --- Name: Fullerton Dean CIK: 0002032211 Role: Officer (Chief Operating Officer) --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-06-25 | Code: A (Grant or award) Shares: +408,163 | Price: $0.00 Exercisable: N/A | Expires: 2036-06-25 Shares Owned After: 408,163 | Ownership: D (Direct) Footnotes: [F1] Awarded pursuant to Plug Power Inc.'s 2021 Stock Option and Incentive Plan, as amended. [F2] The shares underlying this stock option shall vest in three equal annual installments following the grant date, subject to the Reporting Person's continued service on each such vesting date. [Transaction #2] Security: Stock Option (Right to Buy) Date: 2026-06-25 | Code: A (Grant or award) Shares: +414,508 | Price: $0.00 Exercisable: N/A | Expires: 2036-06-25 Shares Owned After: 414,508 | Ownership: D (Direct) Footnotes: [F1] Awarded pursuant to Plug Power Inc.'s 2021 Stock Option and Incentive Plan, as amended. [F2] The shares underlying this stock option shall vest in three equal annual installments following the grant date, subject to the Reporting Person's continued service on each such vesting date. --- Footnotes (Complete Index) --- F1: Awarded pursuant to Plug Power Inc.'s 2021 Stock Option and Incentive Plan, as amended. F2: The shares underlying this stock option shall vest in three equal annual installments following the grant date, subject to the Reporting Person's continued service on each such vesting date. --- Signature --- /s/ /s/ Gerard L. Conway, Jr., Attorney-in-Fact (2026-06-29)