ENERGY RECOVERY INC

Ticker: ERII CUSIP: 29270J100 Class: Common Stock

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q1 2018

Shares 5,878 Value ($000) $48 Avg Close $8.08 Range $6.17 - $9.21

Q4 2017

Shares 5,544 Value ($000) $49 Avg Close $9.12 Range $7.48 - $11.30

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2018	5,878	$48	$8.08	$6.17 - $9.21
Q4 2017	5,544	$49	$9.12	$7.48 - $11.30