David Mindnich - 18 May 2023 Form 4 Insider Report for PLUG POWER INC (PLUG)

Footnote F1

Awarded pursuant to Plug Power Inc.'s 2021 Stock Option and Incentive Plan, as amended.

Footnote F2

Up to one-third (1/3) of the shares underlying the performance stock options will vest and become exercisable on each of the first three anniversaries of the grant date, provided that the daily volume weighted average price ("VWAP") of the Company's common stock during any 30 consecutive trading day period in the three year performance period following the grant date of the stock options equals or exceeds certain levels.

Footnote F3

One-third (1/3) of the 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 during any 30 consecutive trading day period equals $9.84; an additional one-third (1/3) 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 during any 30 consecutive trading day period equals $11.81; and the remaining one-third (1/3) 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 during any 30 consecutive trading day period equals or exceeds $13.77.

Footnote F4

There will be no interpolation for the performance stock option if the VWAP falls between any two stock price hurdles. 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.