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ACK Asset Management’s Energy Recovery ERII Stock Holding History

ACK Asset Management’s Portfolio ERII Stock Details ERII Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-677,251
Closed -$9.14M – 26
2025
Q4 		$9.14M Buy
+677,251
New +$10.3M 1.15% 21
2023
Q4 		– Sell
-877,400
Closed -$18.6M – 22
2023
Q3 		$18.6M Hold
877,400
– – 2.7% 17
2023
Q2 		$24.5M Hold
877,400
– – 3.05% 14
2023
Q1 		$20.2M Buy
877,400
+150,000
+21% +$3.29M 3.09% 13
2022
Q4 		$14.9M Buy
727,400
+10,000
+1% +$219K 2.74% 15
2022
Q3 		$15.6M Hold
717,400
– – 4.13% 12
2022
Q2 		$13.9M Buy
+717,400
New +$13.9M 3.9% 12

Other funds holding ERII

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Ameriprise
Ameriprise Minneapolis, Minnesota $495B AUM 43.24% 1-Year Est. Return
Amundi
Amundi Paris, France $416B AUM 44.19% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fidelity International
Fidelity International Hamilton, Bermuda $139B AUM 29.06% 1-Year Est. Return
Legal & General Group
Legal & General Group London, United Kingdom $480B AUM 42.84% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

ACK Asset Management's ERII Position: Q1 2026 in Review

ACK Asset Management sold out of Energy Recovery (ERII) in Q1 2026, closing a stake of 677,251 shares — an estimated $9.14M sold.

ACK Asset Management first reported a position in ERII in Q2 2022 and held it in 7 quarters. The position peaked at $24.5M in Q2 2023. 197 funds tracked by Wall St. Rank hold ERII as of Q1 2026.

  • ACK Asset Management reported no remaining Energy Recovery position as of Q1 2026 after selling out during the quarter.
  • ACK Asset Management sold 677,251 Energy Recovery shares in Q1 2026, an estimated $9.14M.
  • ACK Asset Management first reported a position in Energy Recovery in Q2 2022 and held it in 7 quarters.
  • ACK Asset Management's Energy Recovery position peaked at $24.5M in Q2 2023.
  • 197 funds tracked by Wall St. Rank held Energy Recovery as of Q1 2026.

Based on ACK Asset Management's 13F filing for Q1 2026, filed 15 May 2026.