---
schema_version: "secwatch.filing_event.v1"
accession: "0001421517-26-000050"
form_type: "8-K"
ticker: "ERII"
cik: "0001421517"
company_name: "Energy Recovery, Inc."
filed_at: "2026-05-28T20:05:45+00:00"
generated_at: "2026-05-28T21:15:53.052017+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Energy Recovery CEO David Moon accelerates retirement; Alex Buehler named interim CEO

## Summary
- David Moon resigned as President, CEO and board member effective May 26, 2026 for personal reasons; no disagreement with management.
- Board member Alex Buehler appointed Interim President and CEO; Buehler was Energy Recovery CFO (2011-2014) and board member since 2015.
- Buehler steps down from Audit and Compensation Committees; Arve Hanstveit named new Audit Committee Chair.
- Board has engaged a leading executive search firm to conduct a permanent CEO search, evaluating internal and external candidates.
- Buehler's interim compensation has not yet been determined; amendment to 8-K will disclose terms when set.

## SEC filing metadata
- accession: 0001421517-26-000050
- form_type: 8-K
- ticker: ERII
- cik: 0001421517
- company_name: Energy Recovery, Inc.
- filed_at: 2026-05-28T20:05:45+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1421517/000142151726000050/0001421517-26-000050-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1421517/000142151726000050/erii-20260528.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001421517-26-000050
- JSON: https://secwatch.observer/filing/0001421517-26-000050.json
- Plain text: https://secwatch.observer/filing/0001421517-26-000050.txt

## Source-grounded claims
- claim_id: 70dc33d6e1
  claim: Alex Buehler was appointed as Interim President and Chief Executive Officer at Energy Recovery, Inc..
  evidence_excerpt: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1421517/000142151726000050/0001421517-26-000050-index.htm
- claim_id: 87a54184ba
  claim: David Moon resigned as President, Chief Executive Officer at Energy Recovery, Inc..
  evidence_excerpt: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1421517/000142151726000050/0001421517-26-000050-index.htm
- claim_id: ad310c8bf3
  claim: David Moon resigned as Member of the Board at Energy Recovery, Inc..
  evidence_excerpt: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1421517/000142151726000050/0001421517-26-000050-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.