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Energy Recovery, Inc. (ERII) institutional ownership

Latest close $8.42 Jul 24, 2026
Market cap$445M 52-week range SectorIndustrials
Funds holding · Q1 2026
200
reported ERII position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
104 buyers · 96 sellers

Energy Recovery, Inc. (ERII) price and institutional activity

Dates

Q1 2026

$0 bought by 104 investors
AmundiAmeriprise Financial Inc +102 more
$0 sold by 96 investors
Ack Asset Management LLCQube Research & Technologies Ltd +94 more
Bought Sold Totals per quarter; hover a bar for the names.

Energy Recovery, Inc. (ERII) institutional activity · 200

Investor Type Est. change Change Δ Own Date
Amundi · Added
Change +889K Date Q1 2026
Amundi Added· Q1 2026 +889K Q1 2026
Ameriprise Financial Inc · Added
Change +696K Date Q1 2026
Ameriprise Financial Inc Added· Q1 2026 +696K Q1 2026
Ack Asset Management LLC · Exited
Change −677K Δ Own −100.0% Date Q1 2026
Ack Asset Management LLC Exited· Q1 2026 −677K −100.0% Q1 2026
Legal & General · Added
Change +559K Date Q1 2026
Legal & General Added· Q1 2026 +559K Q1 2026
683 Capital Management, LLC · New
Change +550K Date Q1 2026
683 Capital Management, LLC New· Q1 2026 +550K Q1 2026
Qube Research & Technologies Ltd · Exited
Change −386K Δ Own −100.0% Date Q1 2026
Qube Research & Technologies Ltd Exited· Q1 2026 −386K −100.0% Q1 2026
Select Equity Group, L.P. · Reduced
Change −379K Date Q1 2026
Select Equity Group, L.P. Reduced· Q1 2026 −379K Q1 2026
Duff & Phelps Investment Management Co · Exited
Change −301K Δ Own −100.0% Date Q1 2026
Duff & Phelps Investment Management Co Exited· Q1 2026 −301K −100.0% Q1 2026
Wellington Management Group LLP · Exited
Change −301K Δ Own −100.0% Date Q1 2026
Wellington Management Group LLP Exited· Q1 2026 −301K −100.0% Q1 2026
Centerbook Partners LP · New
Change +272K Date Q1 2026
Centerbook Partners LP New· Q1 2026 +272K Q1 2026
Alpha Wave Global, LP · Exited
Change −265K Δ Own −100.0% Date Q1 2026
Alpha Wave Global, LP Exited· Q1 2026 −265K −100.0% Q1 2026
BlackRock · Reduced
Change −246K Date Q1 2026
BlackRock Reduced· Q1 2026 −246K Q1 2026
Brown Capital Management LLC · Reduced
Change −227K Date Q1 2026
Brown Capital Management LLC Reduced· Q1 2026 −227K Q1 2026
Assenagon Asset Management S.A. · Exited
Change −220K Δ Own −100.0% Date Q1 2026
Assenagon Asset Management S.A. Exited· Q1 2026 −220K −100.0% Q1 2026
Diamond Hill Capital Management Inc · Reduced
Change −215K Date Q1 2026
Diamond Hill Capital Management Inc Reduced· Q1 2026 −215K Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 200

Famous investor activity in Energy Recovery, Inc. (ERII)

Energy Recovery, Inc. (ERII) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Mitchell John Joseph · Director Grant (A) 17K
Owned 17K Trade date Jul 9, 2026 Filed date Jul 22, 2026
Mitchell John Joseph Director Grant (A) 17K 17K Jul 9, 2026 Jul 22, 2026
Sabol Colin R. · Director Buy +$99K
Price $8.88 Qty +11K Owned 56K Trade date Jun 15, 2026 Filed date Jun 17, 2026
Sabol Colin R. Director Buy $8.88 +11K +$99K 56K Jun 15, 2026 Jun 17, 2026
Buehler Alexander J. · Director Sell −$130K
Price $8.71 Qty −15K Owned 67K Trade date Jun 15, 2026 Filed date Jun 17, 2026
Buehler Alexander J. Director Sell $8.71 −15K −$130K 67K Jun 15, 2026 Jun 17, 2026
Buehler Alexander J. · Director 2 operations $0
Price $8.60 Qty 0 Owned 0 Trade date Jun 15, 2026 Filed date Jun 17, 2026
Buehler Alexander J. Director 2 operations $8.60 0 $0 0 Jun 15, 2026 Jun 17, 2026
Tondreau Pamela L. · Director Grant (A) $185K
Price $8.29 Qty 22K Owned 61K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Tondreau Pamela L. Director Grant (A) $8.29 22K $185K 61K Jun 4, 2026 Jun 5, 2026
Chow Joan Kai · Director Grant (A) $150K
Price $8.29 Qty 18K Owned 52K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Chow Joan Kai Director Grant (A) $8.29 18K $150K 52K Jun 4, 2026 Jun 5, 2026
Sabol Colin R. · Director Grant (A) $150K
Price $8.29 Qty 18K Owned 44K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Sabol Colin R. Director Grant (A) $8.29 18K $150K 44K Jun 4, 2026 Jun 5, 2026
Hanstveit Arve · Director Grant (A) $150K
Price $8.29 Qty 18K Owned 401K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Hanstveit Arve Director Grant (A) $8.29 18K $150K 401K Jun 4, 2026 Jun 5, 2026
Tondreau Pamela L. · Director Buy +$167K
Price $8.34 Qty +20K Owned 37K Trade date May 13, 2026 Filed date May 15, 2026
Tondreau Pamela L. Director Buy $8.34 +20K +$167K 37K May 13, 2026 May 15, 2026
Ryan Aidan · Officer Grant (A) $215K
Price $11.61 Qty 19K Owned 34K ΔOwn +118.6% Trade date May 6, 2026 Filed date Jun 25, 2026
Ryan Aidan Officer Grant (A) $11.61 19K $215K 34K +118.6% May 6, 2026 Jun 25, 2026
Hanstveit Arve · Director Sell −$25K
Price $10.29 Qty −2K Owned 383K Trade date Apr 6, 2026 Filed date Apr 8, 2026
Hanstveit Arve Director Sell $10.29 −2K −$25K 383K Apr 6, 2026 Apr 8, 2026
Hanstveit Arve · Director Sell −$1.7M
Price $10.14 Qty −165K Owned 385K Trade date Apr 2, 2026 Filed date Apr 6, 2026
Hanstveit Arve Director Sell $10.14 −165K −$1.7M 385K Apr 2, 2026 Apr 6, 2026
Hanstveit Arve · Director Sell −$274K
Price $10.96 Qty −25K Owned 550K Trade date Mar 10, 2026 Filed date Mar 11, 2026
Hanstveit Arve Director Sell $10.96 −25K −$274K 550K Mar 10, 2026 Mar 11, 2026
Hanstveit Arve · Director Sell −$123K
Price $10.62 Qty −12K Owned 575K Trade date Mar 6, 2026 Filed date Mar 9, 2026
Hanstveit Arve Director Sell $10.62 −12K −$123K 575K Mar 6, 2026 Mar 9, 2026
Hanstveit Arve · Director Sell −$411K
Price $10.71 Qty −38K Owned 587K Trade date Mar 5, 2026 Filed date Mar 9, 2026
Hanstveit Arve Director Sell $10.71 −38K −$411K 587K Mar 5, 2026 Mar 9, 2026
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Energy Recovery, Inc. (ERII) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
BlackRock Inc. 5.0M
% of shares outstanding 8.8% Filing date Jan 25, 2024
BlackRock Inc. 5.0M 8.8% Jan 25, 2024
Amundi 4.0M
% of shares outstanding 7.8% Filing date Jul 22, 2026
Amundi 4.0M 7.8% Jul 22, 2026
Ameriprise Financial Inc 4.0M
% of shares outstanding 6.9% Filing date Nov 14, 2024
Ameriprise Financial Inc 4.0M 6.9% Nov 14, 2024
Brown Capital Management LLC 3.5M
% of shares outstanding 6.1% Filing date Nov 14, 2024
Brown Capital Management LLC 3.5M 6.1% Nov 14, 2024
FMR LLC 3.4M
% of shares outstanding 5.8% Filing date Nov 12, 2024
FMR LLC 3.4M 5.8% Nov 12, 2024
Vanguard Group Inc 3.0M
% of shares outstanding 5.2% Filing date Feb 13, 2024
Vanguard Group Inc 3.0M 5.2% Feb 13, 2024
Lorentzen Ole Peter 2.8M
% of shares outstanding 5.0% Filing date Dec 2, 2021
Lorentzen Ole Peter 2.8M 5.0% Dec 2, 2021
Sundt AS 2.7M
% of shares outstanding 4.7% Filing date May 17, 2021
Sundt AS 2.7M 4.7% May 17, 2021
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Energy Recovery, Inc. (ERII) ownership FAQ

Who owns ERII?

200 reporting institutions disclosed ERII position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.