PLUG POWER INC

Ticker: PLUG CUSIP: 72919P202 Class: Common Stock

THOMPSON INVESTMENT MANAGEMENT, INC.'s Holding History (CIK: 0001277279)

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

Q4 2016

Shares 52,000 Value ($000) $62 Avg Close $1.47 Range $1.18 - $1.76

Q3 2016

Shares 102,500 Value ($000) $175 Avg Close $1.66 Range $1.34 - $1.95

Q2 2016

Shares 102,500 Value ($000) $191 Avg Close $1.91 Range $1.60 - $2.28

Q1 2016

Shares 102,500 Value ($000) $210 Avg Close $1.88 Range $1.30 - $2.25

Q4 2015

Shares 102,500 Value ($000) $216 Avg Close $2.20 Range $1.76 - $2.98

Q3 2015

Shares 102,500 Value ($000) $188 Avg Close $2.13 Range $1.56 - $2.85

Q2 2015

Shares 78,500 Value ($000) $192 Avg Close $2.62 Range $2.32 - $2.85

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2016	52,000	$62	$1.47	$1.18 - $1.76
Q3 2016	102,500	$175	$1.66	$1.34 - $1.95
Q2 2016	102,500	$191	$1.91	$1.60 - $2.28
Q1 2016	102,500	$210	$1.88	$1.30 - $2.25
Q4 2015	102,500	$216	$2.20	$1.76 - $2.98
Q3 2015	102,500	$188	$2.13	$1.56 - $2.85
Q2 2015	78,500	$192	$2.62	$2.32 - $2.85