Plug Power

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-18 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: 2026-09-18 | Code: S (Open market sale) Shares: -200,000 | Price: $2.14 Total Value: $428,300.00 Shares Owned After: 101,249 | 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. [F2] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.135 to $2.148, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. --- 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. F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.135 to $2.148, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. --- Signature --- /s/ /s/ Gerard L. Conway, Jr., Attorney-in-Fact (2026-09-22)