Alex Buehler was named President and Chief Executive Officer of Energy Recovery, Inc., succeeding David Moon. As of November 6, 2026, Energy Recovery, Inc. has reported 4 leadership change filings to the SEC under Item 5.02 of Form 8-K, from May 6, 2026 to July 13, 2026, naming 3 appointments and 2 departures (Form 8-K, May 28, 2026).
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Key facts
- · In / out: In · Person: John Mitchell · 8-K, 2026-07-13
- · In / out: Reported · Person: not named in the filing · 8-K/A, 2026-06-11
- · In / out: Out · Person: David Moon · Role: Chief Executive Officer · Effective: 2026-05-26 · 8-K, 2026-05-28
- · In / out: Out · Person: David Moon · Role: President and Chief Executive Officer · 8-K, 2026-05-06
Energy Recovery, Inc. reported changes in 4 filings among its directors and officers to the SEC on Form 8-K, Item 5.02, from 2026-05-06 to 2026-07-13. They name 4 people, with 3 appointments and 2 departures. Every row below is cited to the filing it comes from, and this page adds each new change as Energy Recovery, Inc. files it.
Layoffs on record: 1 filing or notice, latest 2026-02-25 (layoff filings and notices).
Also on the record for Energy Recovery, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 26, 2026 | Stake report, Schedule 13G/A, by AMUNDI | 7.03% of the class | 5%+ stakes | Source |
| August 14, 2026 | Stake report, Schedule 13G/A, by Ameriprise Financial, Inc. | 1.3% of the class | 5%+ stakes | Source |
| July 22, 2026 | Stake report, Schedule 13G/A, by AMUNDI | 7.77% of the class | 5%+ stakes | Source |
| April 10, 2026 | Stake report, Schedule 13G/A, by AMUNDI | 7.14% of the class | 5%+ stakes | Source |
| April 8, 2026 | Stake report, Schedule 13G/A, by Ameriprise Financial, Inc. | 10% of the class | 5%+ stakes | Source |
| March 26, 2026 | Stake report, Schedule 13G/A, by The Vanguard Group | — | 5%+ stakes | Source |
| February 24, 2026 | Stake report, Schedule 13G/A, by AMUNDI | 5.38% of the class | 5%+ stakes | Source |
| February 17, 2026 | Stake report, Schedule 13G, by AMUNDI | 5.38% of the class | 5%+ stakes | Source |
| February 17, 2026 | Stake report, Schedule 13G/A, by Ameriprise Financial, Inc. | 8.6% of the class | 5%+ stakes | Source |
| August 14, 2025 | Stake report, Schedule 13G/A, by Ameriprise Financial, Inc. | 9.9% of the class | 5%+ stakes | Source |
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More on Energy Recovery, Inc. and the records around it.
Energy Recovery, Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
- Layoff notices Feb 2026
- Who owns it
Companies that share a holder
- AMUNDI also filed stake reports on 6 other companies: Liberty Live Holdings, Inc. (Oct 2026)
- Ameriprise Financial, Inc. also filed stake reports on 65 other companies: Universal Electronics Inc. (Sep 2026), America's Car-Mart, Inc. (Aug 2026), Ampco-Pittsburgh Corporation (Aug 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-07-13 | In | 8-K, 2026-07-13 | |||
| 2026-06-11 | Reported | not named in the filing | 8-K/A, 2026-06-11 | ||
| 2026-05-28 | Out | Chief Executive Officer | 2026-05-26 | 8-K, 2026-05-28 | |
| 2026-05-28 | In | President and Chief Executive Officer | 8-K, 2026-05-28 | ||
| 2026-05-06 | Out | President and Chief Executive Officer | 8-K, 2026-05-06 | ||
| 2026-05-06 | In | Chief Financial Officer | 8-K, 2026-05-06 |
Who leads Energy Recovery, Inc., as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- President and Chief Executive Officer: Alex Buehler, appointed (filed 2026-05-28).
- Chief Executive Officer: David Moon, departure reported, effective 2026-05-26 (filed 2026-05-28). No successor is named in these filings.
- Chief Financial Officer: Aidan Ryan, appointed (filed 2026-05-06).
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Appointed: John Mitchell
On July 9, 2026, the Board of Directors (the "Board") of Energy Recovery, Inc (the "Registrant") appointed Mr. John Mitchell to its Board.
- With the appointment of Mr. Mitchell, the Registrant's Board consists of six (6) directors.
- Mr. Mitchell will receive the same compensation (pro-rated for his actual service) and indemnification as the Registrant's other non-employee directors.
Reported
On May 28, 2026, Energy Recovery, Inc. (the "Company") filed a Current Report on Form 8-K (the "Original Report") to announce the appointment of Mr. Alex Buehler as the Company's Interim President and Chief Executive Officer.
- At the time of the filing of the Original Report, Mr. Buehler's compensation as Interim President and Chief Executive Officer had not yet been determined by the Company's Compensation Committee.
- The information contained in the Amendment should be read in conjunction with the information contained in the Original Report.
- Mr. Buehler's compensation as Interim President and Chief Executive Officer are set forth in that certain Offer of Employment dated June 5, 2026, by and between the Company and Mr. Buehler (the "Employment Letter").
- Pursuant to the terms of the Employment Letter, Mr. Buehler will receive an annual salary of $645,000.
- In addition, Mr. Buehler will be eligible for a success bonus to be paid, if at all, 30 days after the start date of the next permanent President and Chief Executive Officer.
- Mr. Buehler will also be eligible to receive standard Company benefits.
Departing: David Moon, Chief Executive Officer, effective 2026-05-26
On May 25, 2026, Mr. David Moon informed the Board of Directors (the "Board") of Energy Recovery, Inc. (the "Company") of his intention to accelerate his previously announced retirement and resign from all positions within the Company, including as President, Chief Executive Officer and as a member of the Board, effective on May 26, 2026.
Appointed: Alex Buehler, President and Chief Executive Officer
On May 26, 2026, the Board appointed Mr. Alex Buehler, age 51, to serve as the Company's Interim President and Chief Executive Officer to serve in these positions until a permanent successor is appointed by the Board.
- Mr. Moon's decision to resign from the Company was not related to any disagreement with the Company's management or the Board on any matter related to the Company's operations, policies or practices.
- Mr. Buehler will retain his board seat during the transition but will step down from the Compensation and Audit Committees, including his role as Audit Committee Chair.
- Mr. Arve Hanstveit has been appointed as the new Audit Committee Chair.
- Mr. Buehler brings deep familiarity with Energy Recovery and the water industry.
- Mr. Buehler served as Energy Recovery's CFO from 2011 to 2014 and has been a member of the Board since 2015.
- Mr. Buehler most recently served as CEO of Integrated Water Services from October 2022 to October 2025, as Interim CEO of LiqTech International from March 2022 to September 2022, and earlier as President and CEO of Brock Group from February 2021 to December 2021.
- Prior to that, Mr. Buehler held many executive level roles at various industrial and infrastructure companies.
- He currently serves as a Chairman of the Board for LiqTech Systems and previously served as a Board member for Viscount Systems.
- Mr. Buehler received a Bachelor of Science in civil engineering from the United States Military Academy at West Point and an MBA from the Wharton School at the University of Pennsylvania.
Departing: David Moon, President and Chief Executive Officer
On May 6, 2026, the Company announced that David Moon, President and Chief Executive Officer of the Company, has notified the Board of Directors (the "Board") of his intention to retire following the appointment of his replacement.
Appointed: Aidan Ryan, Chief Financial Officer
On May 6, 2026, the Company announced that Aidan Ryan, 42, has been appointed as the Interim Chief Financial Officer.
- Mr. Moon will remain as President and Chief Executive Officer until a successor is appointed and has committed to support the Company in an advisory capacity during the transition period for as long as is deemed necessary by the Board.
- The Company has begun a search for Mr. Moon's successor.
- On May 4, 2026, Mike Mancini, Chief Financial Officer of the Company, submitted his resignation to the Company effective as of May 6, 2026.
- Mr. Mancini's decision to resign is not related to any financial or accounting issue or any disagreement with the Company on any matter relating to the Company's operations, policies, or practices.
- Mr. Ryan joined the Company in 2024 in his current role as Vice President of Finance.
- Prior to joining the Company, Mr. Ryan was Head of Finance for two years at Astranis Space Technologies Corp., a telecommunications satellite company where he was instrumental in long-term strategy development and execution to guide profitable growth.
- Previous roles include private equity and hedge fund investing.
- Mr. Ryan holds an MBA from the Wharton School at the University of Pennsylvania and a bachelors degree from the University of Michigan.
- Mr. Ryan's compensation as Interim Chief Financial Officer is set forth in that certain offer letter dated, May 4, 2026 (the "Employment Letter").
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.