HUDSON TECHNOLOGIES INC

Ticker: HDSN CUSIP: 444144109 Class: Common Stock

OBERWEIS ASSET MANAGEMENT INC/'s Holding History (CIK: 0000937886)

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

Q3 2017

Shares 214,400 Value ($000) $1,674 Avg Close $8.66 Range $7.58 - $10.40

Q2 2017

Shares 212,000 Value ($000) $1,791 Avg Close $7.65 Range $6.32 - $8.93

Q1 2017

Shares 178,700 Value ($000) $1,179 Avg Close $7.28 Range $6.02 - $8.28

Q4 2016

Shares 126,200 Value ($000) $1,011 Avg Close $7.06 Range $5.55 - $8.50

Q3 2016

Shares 100,000 Value ($000) $665 Avg Close $5.28 Range $3.26 - $6.72

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2017	214,400	$1,674	$8.66	$7.58 - $10.40
Q2 2017	212,000	$1,791	$7.65	$6.32 - $8.93
Q1 2017	178,700	$1,179	$7.28	$6.02 - $8.28
Q4 2016	126,200	$1,011	$7.06	$5.55 - $8.50
Q3 2016	100,000	$665	$5.28	$3.26 - $6.72