PLUG POWER INC — Director's Dealing 2018

May 19, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PLUG POWER INC (PLUG)
CIK: 0001093691
Period of Report: 2018-05-16

Reporting Person: HELMER MAUREEN O (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-16	Plug Power Common Stock	A	29621	$2.11	Acquired	227937	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-16	Common Stock Options	$2.11	A	29621	Acquired	2028-05-16	Common Stock (29621)	Direct

Footnotes

F1: Compensation awarded to directors pursuant to Plug Power's 2011 Non-Employee Directors Compensation Plan.

F2: Options to purchase Common Stock granted in accordance with Plug Power's 2011 Non-Employee Directors Compensation Plan.

F3: This option shall become fully vested on May 16, 2019.