As of March 23, 2026, Energy Recovery's top three insider holders are Ole Peter Lorentzen (TenPercentOwner, 5.16Mn shares), Arve Hanstveit (Director, 550.22K shares), Robert Yu Lang Mao (Director, 248.94K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Ole Peter Lorentzen | 0 | 5,155,239 | 17 Sep, 2021 | |
| Arve Hanstveit | 550,220 | 0 | 11 Mar, 2026 | |
| Robert Yu Lang Mao | 248,935 | 0 | 24 May, 2024 | |
| David W Moon | President And Ceo | 233,069 | 0 | 19 Feb, 2026 |
| Farshad Ghasripoor | Chief Technology Officer | 52,860 | 70,230 | 05 Feb, 2025 |
| Rodney Clemente | Svp, Water | 116,008 | 0 | 06 Mar, 2026 |
| William Yeung | Chief Legal Officer | 104,167 | 0 | 19 Feb, 2026 |
| Michael S. Mancini | Chief Financial Officer | 75,051 | 0 | 19 Feb, 2026 |
| Alexander J Buehler | 66,328 | 0 | 06 Jun, 2025 | |
| Pamela L. Tondreau | 55,890 | 0 | 06 Jun, 2025 | |
| Natarajan Ramanan | Chief Technology Officer | 52,565 | 0 | 06 Mar, 2026 |
| Matthew Hostetler | Chief Human Resources Officer | 46,556 | 0 | 19 Feb, 2026 |
| Joshua Ballard | Chief Financial Officer | 40,376 | 0 | 30 May, 2024 |
| David W Moon | President And Ceo | 0 | 36,950 | 15 May, 2025 |
| Joan Kai Chow | 34,022 | 0 | 06 Jun, 2025 | |
| Robert Yu Lang Mao | President And Ceo | 0 | 32,166 | 04 Oct, 2021 |
| Colin R Sabol | 26,397 | 0 | 06 Jun, 2025 | |
| Olav Fjell | 22,812 | 0 | 10 Jun, 2021 | |
| Sherif Foda | 9,619 | 0 | 16 Sep, 2022 | |
| William Yeung | Chief Legal Officer | 0 | 5,568 | 17 Jun, 2022 |
| Lisa A Pollina | 4,007 | 0 | 13 Jun, 2023 | |
| Colin R Sabol | 0 | 3,000 | 13 Nov, 2023 | |
| Joan Kai Chow | 0 | 1,500 | 13 Nov, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 10 Mar, 2026 | Arve Hanstveit | Common Stock | D | 25,000 | $10.96 | 550,220 | D | S |
| 05 Mar, 2026 | Arve Hanstveit | Common Stock | D | 38,418 | $10.71 | 586,802 | D | S |
| 06 Mar, 2026 | Arve Hanstveit | Common Stock | D | 11,582 | $10.62 | 575,220 | D | S |
| 04 Mar, 2026 | Rodney Clemente | Common Stock | D | 20,568 | $10.61 | 116,008 | D | S |
| 05 Mar, 2026 | Natarajan Ramanan | Common Stock | D | 272 | $10.57 | 52,565 | D | S |
| 03 Mar, 2026 | Natarajan Ramanan | Common Stock | D | 2,724 | $10.22 | 52,837 | D | F |
| 17 Feb, 2026 | Michael S. Mancini | Common Stock | A | 45,626 | $0.00 | 75,051 | D | A |
| 17 Feb, 2026 | William Yeung | Common Stock | A | 25,959 | $0.00 | 104,167 | D | A |
| 17 Feb, 2026 | Rodney Clemente | Common Stock | A | 45,626 | $0.00 | 136,576 | D | A |
| 17 Feb, 2026 | Matthew Hostetler | Common Stock | A | 25,959 | $0.00 | 46,556 | D | A |
| 17 Feb, 2026 | Natarajan Ramanan | Common Stock | A | 29,106 | $0.00 | 55,561 | D | A |
| 17 Feb, 2026 | David W Moon | Common Stock | A | 81,812 | $0.00 | 233,069 | D | A |
| 05 Feb, 2026 | William Yeung | Common Stock | D | 890 | $14.59 | 78,854 | D | S |
| 05 Feb, 2026 | Rodney Clemente | Common Stock | D | 724 | $14.59 | 90,950 | D | S |
| 06 Feb, 2026 | William Yeung | Common Stock | D | 646 | $15.14 | 78,208 | D | S |
| 30 Jan, 2026 | Michael S. Mancini | Common Stock | D | 4,798 | $14.30 | 29,425 | D | F |
| 30 Jan, 2026 | Matthew Hostetler | Common Stock | D | 3,359 | $14.30 | 20,597 | D | F |
| 30 Jan, 2026 | David W Moon | Common Stock | D | 17,160 | $14.30 | 151,257 | D | F |
| 28 Jan, 2026 | William Yeung | Common Stock | D | 7,271 | $14.55 | 90,098 | D | S |
| 30 Jan, 2026 | Rodney Clemente | Common Stock | D | 694 | $14.65 | 100,071 | D | F |