ENERGY RECOVERY INC

Ticker: ERII CUSIP: 29270J100 Class: Common Stock

Portolan Capital Management, LLC's Holding History (CIK: 0001350290)

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

Q4 2021

Shares 69,150 Value ($000) $1,486 Avg Close $20.92 Range $18.50 - $24.99

Q3 2021

Shares 84,771 Value ($000) $1,613 Avg Close $20.30 Range $17.94 - $23.69

Q2 2021

Shares 342,630 Value ($000) $7,805 Avg Close $19.71 Range $16.40 - $22.81

Q1 2021

Shares 352,417 Value ($000) $6,463 Avg Close $16.01 Range $13.45 - $20.25

Q4 2020

Shares 323,076 Value ($000) $4,407 Avg Close $10.67 Range $8.12 - $13.98

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2021	69,150	$1,486	$20.92	$18.50 - $24.99
Q3 2021	84,771	$1,613	$20.30	$17.94 - $23.69
Q2 2021	342,630	$7,805	$19.71	$16.40 - $22.81
Q1 2021	352,417	$6,463	$16.01	$13.45 - $20.25
Q4 2020	323,076	$4,407	$10.67	$8.12 - $13.98