Form 4 Filing for Arve Hanstveit

This filing reports a sale of 165,292 shares of Common Stock by Arve Hanstveit, a director at Energy Recovery, Inc. (ERII), on April 2, 2026. The sale was executed by a broker to cover a margin call on pledged shares. The transaction code was "S" (sale), and the disposal code was "D". The price per share was $10.14, and post-transaction, Mr. Hanstveit holds 384,928 shares. Additionally, the filing details indirect holdings of 60,000 shares each in the Sophie Hanstveit Irrevocable Trust and the Natasha Hanstveit Irrevocable Trust, where Mr. Hanstveit acts as sole trustee with voting and investment power. This report is accompanied by a Power of Attorney document, designating specific individuals to act on behalf of Mr. Hanstveit for SEC filings.