Sec Form 3 Filing - Mindnich David @ PLUG POWER INC - 2023-02-17

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Mindnich David 2. Issuer Name and Ticker or Trading Symbol PLUG POWER INC [ PLUG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Global Manufacturing (Last) (First) (Middle) C/O PLUG POWER INC.,, 968 ALBANY-SHAKER ROAD 3. Date of Earliest Transaction (MM/DD/YY) 02/17/2023 (Street) LATHAM, NY12110 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 218,208 ( 1 ) D Common Stock 621 I 401(k) Plan ( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 27.15 ( 3 ) 09/02/2031 Common Stock 250,000 D Performance Stock Option (Right to Buy) $ 26.38 ( 4 )( 5 ) 08/22/2032 Common Stock 1,500,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Mindnich David C/O PLUG POWER INC., 968 ALBANY-SHAKER ROAD LATHAM, NY12110 EVP, Global Manufacturing Signatures /s/ Gerard L. Conway, Jr., Attorney-in-Fact 03/14/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes a restricted stock award granted on September 2, 2021 pursuant to Plug Power's 2021 Stock Option and Incentive Plan, as amended (the "Plan") in the amount of 250,000 shares, of which 83,333 shares have vested with the remaining 166,667 shares scheduled to vest in substantially equal installments on September 2, 2023 and September 2, 2024. ( 2 )The Reporting Person holds 621 shares of common stock in Plug Power Inc.'s 401(k) plan. The information in this report is based on a plan statement as of December 31, 2022. ( 3 )Awarded pursuant to the Plan. The shares underlying this option vest and become exercisable in three equal annual installments, with the first installment having vested on September 2, 2022. ( 4 )Awarded pursuant to the Plan. Up to one-half (1/2) of the shares underlying the performance stock options will vest and become exercisable on each of the first two anniversaries of the grant date, provided that the daily volume weighted average price of the Issuer's common stock during any 30 consecutive trading day period in the three year performance period following the grant date of the stock options ("VWAP") equals or exceeds certain levels. 375,000 shares underlying the performance stock options will be deemed to have satisfied the performance-based vesting and will be eligible to vest over time if the VWAP equals $42.50; an additional 125,000 shares underlying the options will be deemed to have satisfied the performance-based vesting and will be eligible to vest over time if the VWAP equals $45; ( 5 )an additional 375,000 shares underlying the options will be deemed to have satisfied the performance-based vesting and will be eligible to vest over time if the VWAP equals $50, and the remaining 750,000 of the shares underlying the options will be deemed to have satisfied the performance-based vesting and will be eligible to vest over time if the VWAP equals or exceeds $100. If the VWAP falls between two of the stock price hurdles, an incremental number of shares underlying the options will become exercisable based on linear interpolation in $1 increments. Failure to achieve any of the stock price hurdles applicable to a performance stock option during the three-year performance period will result in applicable options being un-exercisable. The performance-based stock options have a maximum term of seven years from the grant date.

Remarks: Exhibit 24 - Power of Attorney

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