HUDSON TECHNOLOGIES INC

Ticker: HDSN CUSIP: 444144109 Class: Common Stock

ROBOTTI ROBERT's Holding History (CIK: 0001105838)

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

Q4 2019

Shares 13,950 Value ($000) $14 Avg Close $0.67 Range $0.50 - $1.03

Q3 2019

Shares 13,950 Value ($000) $10 Avg Close $0.62 Range $0.30 - $0.93

Q2 2019

Shares 13,950 Value ($000) $12 Avg Close $1.59 Range $0.78 - $2.20

Q1 2019

Shares 13,950 Value ($000) $27 Avg Close $1.41 Range $0.89 - $2.25

Q4 2018

Shares 13,950 Value ($000) $12 Avg Close $1.10 Range $0.70 - $2.14

Q3 2018

Shares 13,950 Value ($000) $18 Avg Close $1.77 Range $1.22 - $2.39

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2019	13,950	$14	$0.67	$0.50 - $1.03
Q3 2019	13,950	$10	$0.62	$0.30 - $0.93
Q2 2019	13,950	$12	$1.59	$0.78 - $2.20
Q1 2019	13,950	$27	$1.41	$0.89 - $2.25
Q4 2018	13,950	$12	$1.10	$0.70 - $2.14
Q3 2018	13,950	$18	$1.77	$1.22 - $2.39