ERII · Insider Trading
Energy Recovery, Inc.
Every open-market purchase and sale reported by ERII officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-23 | John Joseph Mitchell | Director | A | +15,186 | — |
| 2026-07-29 | Rodney Clemente | SVP, Water | MIXED | −7,707 | −$65.65K |
| 2026-07-29 | William Yeung | Chief Legal Officer | MIXED | −4,876 | −$41.34K |
| 2026-07-22 | John Joseph Mitchell | Director | A | +16,797 | — |
| 2026-06-25 | Aidan Ryan | Interim CFO | A | +18,518 | +$214.99K |
| 2026-06-17 | Colin R Sabol | Director | Buy | +11,180 | +$99.27K |
| 2026-06-17 | Alexander J Buehler | Interim President and CEO | MIXED | +427 | +$2.03K |
| 2026-06-05 | Joan Kai Chow | Director | A | +18,094 | +$150.00K |
| 2026-06-05 | Colin R Sabol | Director | A | +18,094 | +$150.00K |
| 2026-06-05 | Arve Hanstveit | Director | A | +18,094 | +$150.00K |
| 2026-06-05 | Pamela L. Tondreau | Director | A | +22,316 | +$185.00K |
| 2026-05-15 | Pamela L. Tondreau | Director | Buy | +20,000 | +$166.84K |
| 2026-04-08 | Arve Hanstveit | Director | Sell | −2,419 | −$24.89K |
| 2026-04-06 | Arve Hanstveit | Director | Sell | −165,292 | −$1.68M |
| 2026-03-11 | Arve Hanstveit | Director | Sell | −25,000 | −$273.98K |
| 2026-03-09 | Arve Hanstveit | Director | Sell | −50,000 | −$534.40K |
| 2026-03-06 | Natarajan Ramanan | Chief Technology Officer | Sell | −272 | −$2.88K |
| 2026-03-06 | Rodney Clemente | SVP, Water | Sell | −20,568 | −$218.31K |
| 2026-03-04 | Natarajan Ramanan | Chief Technology Officer | F | −2,724 | −$27.84K |
| 2026-02-19 | Matthew Hostetler | Chief Human Resources Officer | A | +25,959 | — |
| 2026-02-19 | Michael S. Mancini | Chief Financial Officer | A | +45,626 | — |
| 2026-02-19 | Natarajan Ramanan | Chief Technology Officer | A | +29,106 | — |
| 2026-02-19 | David W Moon | President and CEO | A | +81,812 | — |
| 2026-02-19 | Rodney Clemente | SVP, Water | A | +45,626 | — |
| 2026-02-19 | William Yeung | Chief Legal Officer | A | +25,959 | — |
| 2026-02-09 | Rodney Clemente | SVP, Water | Sell | −724 | −$10.56K |
| 2026-02-09 | William Yeung | Chief Legal Officer | Sell | −1,536 | −$22.77K |
| 2026-02-03 | David W Moon | President and CEO | F | −17,160 | −$245.39K |
| 2026-02-03 | Matthew Hostetler | Chief Human Resources Officer | F | −3,359 | −$48.03K |
| 2026-02-03 | Michael S. Mancini | Chief Financial Officer | F | −4,798 | −$68.61K |
| 2026-02-03 | William Yeung | Chief Legal Officer | MIXED | −17,625 | −$254.32K |
| 2026-02-03 | Rodney Clemente | SVP, Water | F | −9,091 | −$130.24K |
| 2025-12-08 | Arve Hanstveit | Director | Sell | −30,000 | −$445.11K |
| 2025-10-27 | William Yeung | Chief Legal Officer | MIXED | — | −$116.40K |
| 2025-10-22 | William Yeung | Chief Legal Officer | MIXED | — | −$33.53K |
| 2025-10-17 | William Yeung | Chief Legal Officer | MIXED | — | −$31.77K |
| 2025-10-07 | William Yeung | Chief Legal Officer | MIXED | — | −$30.32K |
| 2025-09-22 | William Yeung | Chief Legal Officer | MIXED | — | −$94.83K |
| 2025-09-15 | William Yeung | Chief Legal Officer | MIXED | −2,677 | −$210.52K |
| 2025-07-29 | Rodney Clemente | SVP, Water | MIXED | −7,707 | −$107.46K |
| 2025-07-29 | William Yeung | Chief Legal Officer | F | −1,989 | −$27.61K |
| 2025-06-13 | Arve Hanstveit | Director | Sell | −50,000 | −$635.40K |
| 2025-06-06 | Pamela L. Tondreau | Director | A | +14,847 | — |
| 2025-06-06 | Alexander J Buehler | Director | A | +12,038 | — |
| 2025-06-06 | Colin R Sabol | Director | A | +12,038 | — |
| 2025-06-06 | Joan Kai Chow | Director | A | +12,038 | — |
| 2025-06-06 | Arve Hanstveit | Director | A | +12,038 | — |
| 2025-05-15 | Pamela L. Tondreau | Director | Buy | +4,200 | +$51.57K |
| 2025-05-15 | David W Moon | President and CEO | Buy | +4,200 | +$51.24K |
| 2025-03-13 | Arve Hanstveit | Director | Sell | −50,000 | −$816.95K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Arve Hanstveit | Director | 460,603 | $3.34M |
| David W Moon | President and CEO | 270,019 | $1.96M |
| Farshad Ghasripoor | Chief Technology Officer | 188,090 | $1.37M |
| Rodney Clemente | SVP, Water | 113,688 | $825.37K |
| William Yeung | Chief Legal Officer | 106,907 | $776.14K |
| Pamela L. Tondreau | Director | 98,206 | $712.98K |
| Michael S. Mancini | Chief Financial Officer | 75,051 | $544.87K |
| Alexander J Buehler | Interim President and CEO | 66,755 | $484.64K |
| Colin R Sabol | Director | 58,671 | $425.95K |
| Joan Kai Chow | Director | 53,616 | $389.25K |
| Natarajan Ramanan | Chief Technology Officer | 52,565 | $381.62K |
| Matthew Hostetler | Chief Human Resources Officer | 46,556 | $338.00K |
| Aidan Ryan | Interim CFO | 34,133 | $247.81K |
| John Joseph Mitchell | Director | 15,186 | $110.25K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the ERII quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.