Martin Daniel Hull - Aug 28, 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 28, 2021
Transactions value $: -$167,952
Form type: 4
Date filed: 8/31/2021, 04:02 PM
Previous filing: Aug 23, 2021
Next filing: Nov 9, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PLUG	Common Stock	Options Exercise		+13.3K	+30.46%		57.1K	Aug 28, 2021	Direct	F1
transaction	PLUG	Common Stock	Tax liability	-$168K	-6.31K	-11.06%	$26.60	50.8K	Aug 28, 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	-13.3K	-100%	$0.00^*	0	Aug 28, 2021	Common Stock	13.3K		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 28, 2018, the Reporting Person was granted 40,000 restricted stock units, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.