13 insiders reported 92 Form 4 transactions for Energy Recovery, Inc. (ERII) over the past 18 months (most recent 2026-06-25). Recent activity: Ryan Aidan (Interim CFO) Buy 18,518 shares, BUEHLER ALEXANDER J (Interim President and CEO) Buy 15,327 shares, Sabol Colin R (Director) Buy 11,180 shares, BUEHLER ALEXANDER J (Interim President and CEO) Sell 14,900 shares, Hanstveit Arve (Director) Buy 18,094 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-25 | Ryan Aidan | Interim CFO | Buy | 18,518 | $214,994 |
| 2026-06-17 | BUEHLER ALEXANDER J | Interim President and CEO | Buy | 15,327 | $131,812 |
| 2026-06-17 | Sabol Colin R | Director | Buy | 11,180 | $99,267 |
| 2026-06-17 | BUEHLER ALEXANDER J | Interim President and CEO | Sell | 14,900 | $129,779 |
| 2026-06-05 | Hanstveit Arve | Director | Buy | 18,094 | $149,999 |
| 2026-06-05 | Sabol Colin R | Director | Buy | 18,094 | $149,999 |
| 2026-06-05 | TONDREAU PAMELA L. | Director | Buy | 22,316 | $185,000 |
| 2026-06-05 | Chow Joan Kai | Director | Buy | 18,094 | $149,999 |
| 2026-05-15 | TONDREAU PAMELA L. | Director | Buy | 20,000 | $166,840 |
| 2026-04-08 | Hanstveit Arve | Director | Sell | 2,419 | $24,892 |
| 2026-04-06 | Hanstveit Arve | Director | Sell | 165,292 | $1.7M |
| 2026-03-11 | Hanstveit Arve | Director | Sell | 25,000 | $274,000 |
| 2026-03-09 | Hanstveit Arve | Director | Sell | 11,582 | $123,001 |
| 2026-03-09 | Hanstveit Arve | Director | Sell | 38,418 | $411,457 |
| 2026-03-06 | Clemente Rodney | SVP, Water | Sell | 20,568 | $218,226 |
| 2026-03-06 | Ramanan Natarajan | Chief Technology Officer | Sell | 272 | $2,875 |
| 2026-03-04 | Ramanan Natarajan | Chief Technology Officer | Sell | 2,724 | $27,839 |
| 2026-02-19 | Moon David W | President and CEO | Buy | 81,812 | $0 |
| 2026-02-19 | Ramanan Natarajan | Chief Technology Officer | Buy | 29,106 | $0 |
| 2026-02-19 | Hostetler Matthew | Chief Human Resources Officer | Buy | 25,959 | $0 |
| 2026-02-19 | Yeung William | Chief Legal Officer | Buy | 25,959 | $0 |
| 2026-02-19 | Clemente Rodney | SVP, Water | Buy | 45,626 | $0 |
| 2026-02-19 | Mancini Michael S. | Chief Financial Officer | Buy | 45,626 | $0 |
| 2026-02-09 | Yeung William | Chief Legal Officer | Sell | 646 | $9,780 |
| 2026-02-09 | Yeung William | Chief Legal Officer | Sell | 890 | $12,985 |
Source: SEC Form 4 filings · as of 2026-06-25