Plug Power

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-11 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: PLUG POWER INC (PLUG) CIK: 0001093691 --- Reporting Owner --- Name: Haycraft Benjamin CIK: 0002085249 Role: Officer (CSO & GM EMEA) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-09-11 | Code: S (Open market sale) Shares: -13,810 | Price: $2.14 Total Value: $29,553.40 Shares Owned After: 319,999 | Ownership: D (Direct) Footnotes: [F1] These sales were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted on June 11, 2026. [Transaction #2] Security: Common Stock Date: 2026-09-15 | Code: S (Open market sale) Shares: -18,750 | Price: $2.06 Total Value: $38,625.00 Shares Owned After: 301,249 | Ownership: D (Direct) Footnotes: [F1] These sales were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted on June 11, 2026. --- Footnotes (Complete Index) --- F1: These sales were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted on June 11, 2026. --- Signature --- /s/ /s/ Gerard L. Conway, Jr., Attorney-in-Fact (2026-09-15)