PLUG POWER INC

Ticker: PLUG CUSIP: 72919P202 Class: Common Stock

Granahan Investment Management, LLC's Holding History (CIK: 0001026710)

Note: Option positions (PUT/CALL) are excluded.

Q1 2021

Shares 171,255 Value ($000) $6,138 Avg Close $51.55 Range $30.10 - $75.49

Q4 2020

Shares 268,380 Value ($000) $9,101 Avg Close $22.64 Range $13.27 - $37.51

Q3 2020

Shares 317,128 Value ($000) $4,253 Avg Close $11.02 Range $7.07 - $14.35

Q1 2020

Shares 137,749 Value ($000) $488 Avg Close $4.07 Range $2.53 - $6.05

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	171,255	$6,138	$51.55	$30.10 - $75.49
Q4 2020	268,380	$9,101	$22.64	$13.27 - $37.51
Q3 2020	317,128	$4,253	$11.02	$7.07 - $14.35
Q1 2020	137,749	$488	$4.07	$2.53 - $6.05