PLUG POWER INC

Ticker: PLUG CUSIP: 72919P202 Class: Common Stock

STATE OF MICHIGAN RETIREMENT SYSTEM's Holding History (CIK: 0000762152)

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

Q4 2015

Shares 220,000 Value ($000) $464 Avg Close $2.20 Range $1.76 - $2.98

Q3 2015

Shares 120,000 Value ($000) $220 Avg Close $2.13 Range $1.56 - $2.85

Q2 2015

Shares 100,000 Value ($000) $245 Avg Close $2.62 Range $2.32 - $2.85

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	220,000	$464	$2.20	$1.76 - $2.98
Q3 2015	120,000	$220	$2.13	$1.56 - $2.85
Q2 2015	100,000	$245	$2.62	$2.32 - $2.85