8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)ofthe Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):June 5, 2024

Plug Power Inc.

(Exact name of registrant as specified in itscharter)

(518) 782-7700

Registrant’s telephonenumber, including area code:

N/A

(Former name or former address, if changedsince last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

On June 5, 2024, Plug Power Inc. (the “Company”) held its annual meeting of stockholders (the “Annual Meeting”). Proxies were solicited pursuant to Section 14(a) of the Securities Exchange Act of 1934, as amended. At the Annual Meeting, the Company’s stockholders voted upon the following matters:

At the Annual Meeting, the stockholders elected each of Andrew J. Marsh, Maureen O. Helmer and Kavita Mahtani as a Class I Director, approved the non-binding, advisory resolution regarding the compensation of the Company’s named executive officers, and ratified the appointment of Deloitte as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2024.

Set forth below are the final voting results for each matter voted upon:

Proposal 1 - Election of Class II Directors

Proposal 2 - Non-binding, Advisory Vote on Named Executive OfficerCompensation

Proposal 3 - Ratification of Appointment of Deloitte

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.