Martin Daniel Hull - Aug 19, 2021 Form 4 Insider Report for PLUG POWER INC (PLUG)

Role: Corporate Controller and CAO
Signature: /s/ Gerard L. Conway, Jr., Attorney-in-Fact
Stock symbol: PLUG
Transactions as of: Aug 19, 2021
Transactions value $: -$197,774
Form type: 4
Date filed: 8/23/2021, 07:43 PM
Next filing: Aug 31, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PLUG	Common Stock	Options Exercise		+16.7K	+47.62%		51.7K	Aug 19, 2021	Direct	F1
transaction	PLUG	Common Stock	Tax liability	-$198K	-7.89K	-15.28%	$25.06	43.8K	Aug 19, 2021	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	PLUG	Restricted Stock Unit	Options Exercise	$0	-16.7K	-50%	$0.00	16.7K	Aug 19, 2021	Common Stock	16.7K		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit is the equivalent of one share of Plug Power Inc. common stock.
F2	Tendered to Issuer to satisfy tax withholding obligations of the Reporting Person incurred in connection with the vesting of the Reporting Person's restricted stock unit awards.
F3	On August 19, 2019, the Reporting Person was granted 50,000 restricted stock units, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.