PLUG POWER INC

Ticker: PLUG CUSIP: 72919P202 Class: Common Stock

MACKAY SHIELDS LLC's Holding History (CIK: 0000061227)

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

Q1 2021

Shares 99,694 Value ($000) $3,573 Avg Close $51.55 Range $30.10 - $75.49

Q4 2020

Shares 161,000 Value ($000) $5,459 Avg Close $22.64 Range $13.27 - $37.51

Q3 2020

Shares 127,800 Value ($000) $1,714 Avg Close $11.02 Range $7.07 - $14.35

Q1 2020

Shares 82,700 Value ($000) $293 Avg Close $4.07 Range $2.53 - $6.05

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	99,694	$3,573	$51.55	$30.10 - $75.49
Q4 2020	161,000	$5,459	$22.64	$13.27 - $37.51
Q3 2020	127,800	$1,714	$11.02	$7.07 - $14.35
Q1 2020	82,700	$293	$4.07	$2.53 - $6.05