ENERGY RECOVERY INC

Ticker: ERII CUSIP: 29270J100 Class: Common Stock

ACK Asset Management LLC's Holding History (CIK: 0001510940)

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

Q4 2025

Shares 677,251 Value ($000) $9,136 Avg Close $15.16 Range $13.27 - $18.32

Q3 2023

Shares 877,400 Value ($000) $19 Avg Close $26.69 Range $20.50 - $30.76

Q2 2023

Shares 877,400 Value ($000) $25 Avg Close $24.94 Range $21.78 - $29.71

Q1 2023

Shares 877,400 Value ($000) $20 Avg Close $21.96 Range $19.68 - $24.18

Q4 2022

Shares 727,400 Value ($000) $15 Avg Close $21.88 Range $17.32 - $26.34

Q3 2022

Shares 717,400 Value ($000) $15,596 Avg Close $22.52 Range $18.74 - $26.20

Q2 2022

Shares 717,400 Value ($000) $13,932 Avg Close $19.40 Range $16.92 - $21.97

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	677,251	$9,136	$15.16	$13.27 - $18.32
Q3 2023	877,400	$19	$26.69	$20.50 - $30.76
Q2 2023	877,400	$25	$24.94	$21.78 - $29.71
Q1 2023	877,400	$20	$21.96	$19.68 - $24.18
Q4 2022	727,400	$15	$21.88	$17.32 - $26.34
Q3 2022	717,400	$15,596	$22.52	$18.74 - $26.20
Q2 2022	717,400	$13,932	$19.40	$16.92 - $21.97