As of April 28, 2026, the three largest insider holders of HTO are Atlas Holdings Ltd Gip (TenPercentOwner, 4.58Mn shares), Infrastructure Partners (Uk) Ltd. Atlas (TenPercentOwner, 4.58Mn shares), Eric W Thornburg (President Ceo, 78.42K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Atlas Holdings Ltd Gip | - | 4,582,469 | 0 | 22 Apr, 2026 |
| Infrastructure Partners (Uk) Ltd. Atlas | - | 4,582,469 | 0 | 13 Apr, 2026 |
| Eric W Thornburg | President Ceo | 78,418 | 0 | 04 Mar, 2025 |
| Eric W Thornburg | President Ceo | 78,418 | 0 | 04 Mar, 2025 |
| Eric W Thornburg | President Ceo | 78,418 | 0 | 04 Mar, 2025 |
| Maureen P Westbrook | President Of Ctws | 40,590 | 0 | 30 Dec, 2022 |
| Maureen P Westbrook | President Of Ctws | 40,590 | 0 | 30 Dec, 2022 |
| Maureen P Westbrook | President Of Ctws | 40,590 | 0 | 30 Dec, 2022 |
| Andrew F Walters | Chief Executive Officer | 30,343 | 0 | 03 Mar, 2026 |
| Andrew F Walters | Chief Executive Officer | 30,343 | 0 | 03 Mar, 2026 |
| Andrew F Walters | Chief Executive Officer | 30,343 | 0 | 03 Mar, 2026 |
| Andrew Gere | President Of Sjwc | 25,410 | 0 | 02 Mar, 2023 |
| James Patrick Lynch | Chief Accounting Officer | 25,249 | 0 | 04 Nov, 2022 |
| Bruce A Hauk | President And Coo | 16,616 | 0 | 03 Mar, 2026 |
| Megan Mattern | Cao, Pao And Controller | 14,785 | 0 | 03 Mar, 2026 |
| Megan Mattern | Cao, Pao And Controller | 14,785 | 0 | 03 Mar, 2026 |
| Megan Mattern | Cao, Pao And Controller | 14,785 | 0 | 03 Mar, 2026 |
| A Kristen Johnson | Chief Administrative Officer | 14,565 | 0 | 03 Mar, 2026 |
| Willie D. Jr. Brown | Vp Gen Counsel | 13,554 | 0 | 03 Mar, 2026 |
| Tanya Moniz-Witten | President, San Jose Water Co. | 12,812 | 0 | 01 May, 2025 |
| Gregory P Landis | - | 12,803 | 0 | 15 May, 2025 |
| Ann P Kelly | Cfo And Treasurer | 10,064 | 0 | 03 Mar, 2026 |
| Mary Ann Hanley | - | 9,636 | 0 | 15 May, 2025 |
| Carol P Wallace | - | 9,291 | 0 | 15 May, 2025 |
| Carol P Wallace | - | 9,291 | 0 | 15 May, 2025 |
| Hunt Heather | - | 9,291 | 0 | 15 May, 2025 |
| Carol P Wallace | - | 9,291 | 0 | 15 May, 2025 |
| Rebecca A Klein | - | 7,261 | 0 | 15 May, 2025 |
| Carl Guardino | - | 7,192 | 0 | 15 May, 2025 |
| Wendy Avila-Walker | Vp Of Finance, Controller | 5,806 | 0 | 06 Jan, 2022 |
| Walter J. Bishop | - | 5,353 | 0 | 29 Apr, 2022 |
| Craig J Patla | President Of Ctws | 5,200 | 0 | 04 Mar, 2025 |
| Denise L Kruger | - | 4,976 | 0 | 15 May, 2025 |
| Daniel B. More | - | 4,008 | 0 | 15 May, 2025 |
| Mohammed G. Zerhouni | Svp Of Fin., Prin. Acct. Ofcr. | 3,567 | 0 | 05 Feb, 2024 |
| Mohammed G. Zerhouni | Svp Of Fin., Prin. Acct. Ofcr. | 3,567 | 0 | 05 Feb, 2024 |
| Mohammed G. Zerhouni | Svp Of Fin., Prin. Acct. Ofcr. | 3,567 | 0 | 05 Feb, 2024 |
| Katharine Armstrong | - | 0 | 2,700 | 09 Dec, 2021 |
| Douwe Busschops | Chief Information Officer | 1,768 | 0 | 06 Jan, 2025 |
| Nick Orlando Rowe | - | 505 | 0 | 03 Mar, 2026 |
| Nick Orlando Rowe | - | 505 | 0 | 03 Mar, 2026 |
| Nick Orlando Rowe | - | 505 | 0 | 03 Mar, 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 | 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 | 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 |
| 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 |
| 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 |
| 01 Mar, 2026 | Nick Orlando Rowe | Common Stock | A | 505 | $0.00 | 505 | D | A |
| 27 Feb, 2026 | Willie D. Jr. Brown | Common Stock | A | 1,384 | $0.00 | 12,812 | 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 |
| 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 | 1,704 | $0.00 | 30,948 | D | A |
| 27 Feb, 2026 | Willie D. Jr. Brown | Common Stock | A | 1,263 | $0.00 | 14,075 | D | A |
| 27 Feb, 2026 | Andrew F Walters | Common Stock | A | 1,704 | $0.00 | 30,948 | D | A |
| 27 Feb, 2026 | A Kristen Johnson | Common Stock | A | 1,263 | $0.00 | 15,035 | D | A |