As of November 6, 2026, H2O America is a publicly traded company (Nasdaq: HTO); its largest reported holder is BlackRock, with 14.8% on Schedule 13G/A of October 27, 2026, then ATLAS Infrastructure Partners (UK) Ltd. (11.17%). The largest insider holding is ATLAS Infrastructure Partners (UK) Ltd., a 10% owner, with 4,615,265 shares (9.6% of shares outstanding), per Form 4/A of July 13, 2026 (Schedule 13G/A, October 27, 2026).
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Is H2O America a real, registered company?
- H2o America files with the SEC under CIK 766829 (its SEC filings).
- Its shares are listed under the ticker HTO on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in San Jose, California, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under H2O AMERICA in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names BlackRock (filed 2026-10-27).
Who are H2O America's owners and officers?
H2O America: incorporated in Delaware; business address in San Jose, California; industry Water Supply (Schedule 13G/A, 2026-10-27).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-27 | Blackrock, Inc. | 14.8% |
| Schedule 13G/A, 2026-09-22 | Atlas Infrastructure Partners (Uk) LTD. | 11.17% |
| Schedule 13G/A, 2026-08-19 | Atlas Infrastructure Partners (Uk) LTD. | 11.03% |
| Schedule 13G/A, 2026-07-28 | Blackrock, Inc. | 15.8% |
| Schedule 13G/A, 2026-04-27 | Blackrock, Inc. | 14.4% |
| Schedule 13G/A, 2026-04-08 | Atlas Infrastructure Partners (Uk) LTD. | 10.83% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-03-10 | Atlas Infrastructure Partners (Uk) LTD. | 10.84% |
| Schedule 13G, 2026-03-06 | Future Fund Board Of Guardians | 6.2% |
| Schedule 13G/A, 2026-02-17 | Amundi | 4.78% |
| Schedule 13G/A, 2025-11-14 | Amundi | 6.19% |
| Schedule 13G, 2025-08-13 | Amundi | 5.85% |
Questions about who owns H2O America
Who owns H2O America?
On this page, 3 holders' latest ownership filings report 5% or more of H2O America: Blackrock, Inc. (14.8%, Schedule 13G/A, filed 2026-10-27), Atlas Infrastructure Partners (Uk) LTD. (11.17%, Schedule 13G/A, filed 2026-09-22) and Future Fund Board Of Guardians (6.2%, Schedule 13G, filed 2026-03-06).
Who are the largest shareholders of H2O America?
By the share each holder's latest filing reports, the largest holders of H2O America on this page are Blackrock, Inc. (14.8%), Atlas Infrastructure Partners (Uk) LTD. (11.17%) and Future Fund Board Of Guardians (6.2%).
When did Blackrock, Inc. buy into H2O America?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2026-04-27, reporting 14.4%; its latest, Schedule 13G/A filed 2026-10-27, reports 14.8%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on H2O America covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own H2O America shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- ATLAS Infrastructure Partners (UK) Ltd., a 10% owner: 4,615,265 shares (9.6% of shares outstanding), on a joint filing (Form 4/A, 2026-07-13).
- GIP ATLAS Holdings Ltd, a 10% owner: 4,615,265 shares (9.6% of shares outstanding), on a joint filing (Form 4/A, 2026-07-13).
- , the chief executive and president: 78,418 shares (0.16% of shares outstanding) (Form 4, 2025-03-04).
- , the chief executive and a director: 26,561 shares (0.05% of shares outstanding), 26,461 held directly and 100 indirectly (Form 4, 2026-07-06).
- , a director: 17,085 shares (0.04% of shares outstanding), 1,947 held directly and 15,138 indirectly (Form 4, 2026-05-15).
Shares outstanding: 48,318,991 as of 2026-10-21, from the company's latest SEC cover page.
How much has H2O America raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2026-10-01).
Keep reading
More on H2O America and the records around it.
Companies that share a holder
- AMUNDI also filed stake reports on 6 other companies: Energy Recovery, Inc. (Oct 2026), Liberty Live Holdings, Inc. (Oct 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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