Data spanning the past 90 days through February 19, 2026 reveals that Energy Recovery's three principal insider shareholders consist of TenPercentOwner Ole Peter Lorentzen (5.16Mn shares), Director Arve Hanstveit (625.22K shares), Director Robert Yu Lang Mao (281.10K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Ole Peter Lorentzen | 5,155,239 | 17 Sep, 2021 | |
| Arve Hanstveit | 625,220 | 08 Dec, 2025 | |
| Robert Yu Lang Mao | 281,101 | 24 May, 2024 | |
| David W Moon | President And Ceo | 188,207 | 03 Feb, 2026 |
| Farshad Ghasripoor | Chief Technology Officer | 123,090 | 05 Feb, 2025 |
| Rodney Clemente | Svp And Water | 90,950 | 09 Feb, 2026 |
| William Yeung | Chief Legal Officer | 83,776 | 09 Feb, 2026 |
| Alexander J Buehler | 66,328 | 06 Jun, 2025 | |
| Pamela L. Tondreau | 55,890 | 06 Jun, 2025 | |
| Joshua Ballard | Chief Financial Officer | 40,376 | 30 May, 2024 |
| Joan Kai Chow | 35,522 | 06 Jun, 2025 | |
| Michael S. Mancini | Chief Financial Officer | 29,425 | 03 Feb, 2026 |
| Colin R Sabol | 29,397 | 06 Jun, 2025 | |
| Natarajan Ramanan | Chief Technology Officer | 26,455 | 12 Mar, 2025 |
| Olav Fjell | 22,812 | 10 Jun, 2021 | |
| Matthew Hostetler | Chief Human Resources Officer | 20,597 | 03 Feb, 2026 |
| Sherif Foda | 9,619 | 16 Sep, 2022 | |
| Lisa A Pollina | 4,007 | 13 Jun, 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 |
|---|---|---|---|---|---|---|---|---|
| 06 Feb, 2026 | William Yeung | Common Stock | D | 646 | $15.14 | 78,208 | D | S |
| 05 Feb, 2026 | Rodney Clemente | Common Stock | D | 724 | $14.59 | 90,950 | D | S |
| 05 Feb, 2026 | William Yeung | Common Stock | D | 890 | $14.59 | 78,854 | D | S |
| 02 Feb, 2026 | William Yeung | Common Stock | D | 729 | $14.46 | 79,744 | D | S |
| 30 Jan, 2026 | David W Moon | Common Stock | D | 17,160 | $14.30 | 151,257 | D | F |
| 30 Jan, 2026 | Rodney Clemente | Common Stock | D | 8,397 | $14.30 | 91,674 | D | F |
| 30 Jan, 2026 | Rodney Clemente | Common Stock | D | 694 | $14.65 | 100,071 | D | F |
| 30 Jan, 2026 | William Yeung | Common Stock | D | 1,003 | $14.65 | 89,095 | D | F |
| 30 Jan, 2026 | William Yeung | Common Stock | D | 8,622 | $14.30 | 80,473 | D | F |
| 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 |
| 28 Jan, 2026 | William Yeung | Common Stock | D | 7,271 | $14.55 | 90,098 | D | S |
| 05 Dec, 2025 | Arve Hanstveit | Common Stock | D | 15,000 | $14.71 | 625,220 | D | S |
| 05 Dec, 2025 | Arve Hanstveit | - | - | 625,220 | D | |||
| 04 Dec, 2025 | Arve Hanstveit | - | - | 640,220 | D | |||
| 04 Dec, 2025 | Arve Hanstveit | Common Stock | D | 15,000 | $14.97 | 640,220 | D | S |
| 24 Oct, 2025 | William Yeung | Common Stock | A | 3,530 | $7.50 | 100,899 | D | M |
| 24 Oct, 2025 | William Yeung | Common Stock | D | 5,638 | $18.00 | 97,369 | D | S |
| 24 Oct, 2025 | William Yeung | Common Stock | D | 3,530 | $18.00 | 97,369 | D | S |
| 24 Oct, 2025 | William Yeung | Common Stock | A | 5,638 | $10.19 | 103,007 | D | M |