ENERGY RECOVERY INC

Ticker: ERII CUSIP: 29270J100 Class: Common Stock

Walleye Trading LLC's Holding History (CIK: 0001388391)

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

Q4 2016

Shares 14,400 Value ($000) $149 Avg Close $12.01 Range $8.53 - $16.30

Q1 2016

Shares 9,100 Value ($000) $94 Avg Close $7.29 Range $5.28 - $10.82

Q4 2015

Shares 3,500 Value ($000) $25 Avg Close $6.31 Range $2.09 - $9.50

Q3 2015

Shares 4,000 Value ($000) $9 Avg Close $2.59 Range $2.07 - $3.07

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2016	14,400	$149	$12.01	$8.53 - $16.30
Q1 2016	9,100	$94	$7.29	$5.28 - $10.82
Q4 2015	3,500	$25	$6.31	$2.09 - $9.50
Q3 2015	4,000	$9	$2.59	$2.07 - $3.07