As of May 23, 2026, H2O America's top three insider holders are Infrastructure Partners (Uk) Ltd. Atlas (TenPercentOwner, 4.58Mn shares), Atlas Holdings Ltd Gip (TenPercentOwner, 4.58Mn shares), Eric W Thornburg (President Ceo, 78.42K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Gregory P Landis | - | 12,803 | 0 | 15 May, 2025 |
| Denise L Kruger | - | 4,976 | 0 | 15 May, 2025 |
| Maureen P Westbrook | President Of Ctws | 40,590 | 0 | 30 Dec, 2022 |
| Mary Ann Hanley | - | 9,636 | 0 | 15 May, 2025 |
| Carol P Wallace | - | 9,291 | 0 | 15 May, 2025 |
| A Kristen Johnson | Chief Administrative Officer | 14,565 | 0 | 03 Mar, 2026 |
| Eric W Thornburg | President Ceo | 78,418 | 0 | 04 Mar, 2025 |
| Hunt Heather | - | 9,291 | 0 | 15 May, 2025 |
| Nick Orlando Rowe | - | 505 | 0 | 03 Mar, 2026 |
| Katharine Armstrong | - | 0 | 2,700 | 09 Dec, 2021 |
| Rebecca A Klein | - | 7,261 | 0 | 15 May, 2025 |
| James Patrick Lynch | Chief Accounting Officer | 25,249 | 0 | 04 Nov, 2022 |
| Walter J. Bishop | - | 5,353 | 0 | 29 Apr, 2022 |
| Andrew F Walters | Chief Executive Officer | 30,343 | 0 | 03 Mar, 2026 |
| Craig J Patla | President Of Ctws | 5,200 | 0 | 04 Mar, 2025 |
| Daniel B. More | - | 4,008 | 0 | 15 May, 2025 |
| Andrew Gere | President Of Sjwc | 25,410 | 0 | 02 Mar, 2023 |
| Ann P Kelly | Cfo And Treasurer | 10,064 | 0 | 03 Mar, 2026 |
| Wendy Avila-Walker | Vp Of Finance, Controller | 5,806 | 0 | 06 Jan, 2022 |
| Bruce A Hauk | President And Coo | 16,616 | 0 | 03 Mar, 2026 |
| Carl Guardino | - | 7,192 | 0 | 15 May, 2025 |
| Willie D. Jr. Brown | Vp Gen Counsel | 13,554 | 0 | 03 Mar, 2026 |
| Infrastructure Partners (Uk) Ltd. Atlas | - | 4,582,469 | 0 | 13 Apr, 2026 |
| Mohammed G. Zerhouni | Svp Of Fin., Prin. Acct. Ofcr. | 3,567 | 0 | 05 Feb, 2024 |
| Tanya Moniz-Witten | President, San Jose Water Co. | 12,812 | 0 | 01 May, 2025 |
| Douwe Busschops | Chief Information Officer | 1,768 | 0 | 06 Jan, 2025 |
| Megan Mattern | Cao, Pao And Controller | 14,785 | 0 | 03 Mar, 2026 |
| Atlas Holdings Ltd Gip | - | 4,582,469 | 0 | 22 Apr, 2026 |
* 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 Apr, 2026 | Atlas Holdings Ltd Gip | Common Stock | A | 50,385 | $59.06 | 4,582,469 | D | P |
| 10 Apr, 2026 | Atlas Holdings Ltd Gip | Common Stock | A | 50,385 | $59.06 | 4,582,469 | D | P |
| 10 Apr, 2026 | Infrastructure Partners (Uk) Ltd. Atlas | Common Stock | A | 50,385 | $59.06 | 4,582,469 | D | P |
| 01 Mar, 2026 | Nick Orlando Rowe | Common Stock | A | 505 | $0.00 | 505 | D | A |
| 27 Feb, 2026 | Andrew F Walters | Common Stock | A | 5,950 | $0.00 | 29,244 | D | A |
| 27 Feb, 2026 | Ann P Kelly | Common Stock | A | 1,707 | $0.00 | 10,064 | D | A |
| 27 Feb, 2026 | Andrew F Walters | Common Stock | A | 5,950 | $0.00 | 29,244 | D | A |
| 01 Mar, 2026 | Nick Orlando Rowe | Common Stock | A | 505 | $0.00 | 505 | D | A |
| 27 Feb, 2026 | Megan Mattern | Common Stock | A | 2,166 | $0.00 | 14,785 | D | A |
| 27 Feb, 2026 | Megan Mattern | Common Stock | A | 2,166 | $0.00 | 14,785 | D | A |
| 01 Mar, 2026 | Nick Orlando Rowe | Common Stock | A | 505 | $0.00 | 505 | D | A |
| 27 Feb, 2026 | Andrew F Walters | Common Stock | A | 5,950 | $0.00 | 29,244 | D | A |
| 27 Feb, 2026 | Willie D. Jr. Brown | Common Stock | A | 1,384 | $0.00 | 12,812 | D | A |
| 27 Feb, 2026 | Megan Mattern | Common Stock | A | 2,166 | $0.00 | 14,785 | D | A |
| 27 Feb, 2026 | Bruce A Hauk | Common Stock | A | 2,743 | $0.00 | 15,491 | D | A |
| 27 Feb, 2026 | Andrew F Walters | Common Stock | A | 5,950 | $0.00 | 29,244 | D | A |
| 27 Feb, 2026 | A Kristen Johnson | Common Stock | A | 1,312 | $0.00 | 13,772 | D | A |
| 27 Feb, 2026 | Megan Mattern | Common Stock | A | 2,166 | $0.00 | 14,785 | D | A |
| 01 Mar, 2026 | Nick Orlando Rowe | Common Stock | A | 505 | $0.00 | 505 | D | A |
| 27 Feb, 2026 | Andrew F Walters | Common Stock | A | 1,704 | $0.00 | 30,948 | D | A |