As of November 10, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of BillionToOne, Inc. The largest reported stake is Hummingbird Ventures Management NV's, at 18.57%. 5 filings are on record since January 20, 2026 (Schedule 13D/A, November 9, 2026).
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Key facts
- · Reporting person: Hummingbird Ventures Management NV · Sole voting: 0 · Shared voting: 8,003,039 · Sole dispositive: 0 · Shared dispositive: 8,003,039 · SCHEDULE 13D/A, 2026-11-09
- · Holder: Oguzhan Atay · Percent: 7.3% · SCHEDULE 13G
- · Holder: David Tsao · Percent: 6.9% · SCHEDULE 13G
- · Holder: Krishna Kittu Kolluri ("Kolluri") · Percent: 10.6% · SCHEDULE 13G
- · Holder: Hummingbird Ventures Management NV · Percent: 19.6% · SCHEDULE 13D
BillionToOne, Inc. has 5 Schedule 13D or 13G filings on record since 2026-01-20. 4 holders' latest filing reports 5% or more of class a common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Hummingbird Ventures Management NV | 18.57% | 8,003,039 | SCHEDULE 13D/A, 2026-11-09 | 2026-09-30 |
| Krishna Kittu Kolluri ("Kolluri") | 10.6% | 4,359,505 | SCHEDULE 13G, 2026-02-13 | 2025-11-07 |
| 7.3% | 3,206,861 | SCHEDULE 13G, 2026-02-17 | 2025-12-31 | |
| 6.9% | 3,035,767 | SCHEDULE 13G, 2026-02-17 | 2025-12-31 |
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Hummingbird Ventures Management NV | 0 | 8,003,039 | 0 | 8,003,039 | SCHEDULE 13D/A, 2026-11-09 |
| Hummingbird Opportunity Fund II CommV | 0 | 2,631,664 | 0 | 2,631,664 | SCHEDULE 13D/A, 2026-11-09 |
| Hummingbird Ventures III CommV | 0 | 2,669,141 | 0 | 2,669,141 | SCHEDULE 13D/A, 2026-11-09 |
| Hummingbird Dragons CommV | 0 | 2,015,118 | 0 | 2,015,118 | SCHEDULE 13D/A, 2026-11-09 |
| Hummingbird Collective CommV | 0 | 18,845 | 0 | 18,845 | SCHEDULE 13D/A, 2026-11-09 |
| Hb&Q Nv | 0 | 640,727 | 0 | 640,727 | SCHEDULE 13D/A, 2026-11-09 |
| Nomads Partnership | 0 | 27,544 | 0 | 27,544 | SCHEDULE 13D/A, 2026-11-09 |
| Firat Ileri | 31,758 | 8,003,039 | 31,758 | 8,003,039 | SCHEDULE 13D/A, 2026-11-09 |
| Barend Van den Brande | 0 | 8,003,039 | 0 | 8,003,039 | SCHEDULE 13D/A, 2026-11-09 |
| Lukas Decoster | 0 | 8,003,039 | 0 | 8,003,039 | SCHEDULE 13D/A, 2026-11-09 |
The latest filing identifies BillionToOne, Inc. by CUSIP 090168105 and gives its principal executive office as 1035 O'Brien Drive, Menlo Park, CA 94025 (SCHEDULE 13D/A, 2026-11-09).
Source of funds (Item 3)
Item 3 of the Statement is hereby amended and supplemented by adding the following: Effective September 21, 2026, Libertus Capital I (HV) made a distribution in kind of 88,258 shares of Class A common stock of the Issuer to Hummingbird Ventures III CommV, a limited partner of Libertus Capital I (HV). The distribution was made in respect of Hummingbird Ventures III CommV's existing limited partnership and carried-interest interests in Libertus Capital I (HV).Hummingbird Ventures Management NV, SCHEDULE 13D/A, 2026-11-09
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-01-20 | Hummingbird Ventures Management NV | 19.6% | SCHEDULE 13D |
| 2026-02-13 | Krishna Kittu Kolluri ("Kolluri") | 10.6% | SCHEDULE 13G |
| 2026-02-17 | Oguzhan Atay | 7.3% | SCHEDULE 13G |
| 2026-02-17 | David Tsao | 6.9% | SCHEDULE 13G |
| 2026-11-09 | Hummingbird Ventures Management NV | 18.57% | SCHEDULE 13D/A |
Questions about who owns BillionToOne, Inc.
Who owns BillionToOne, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of BillionToOne, Inc.: Hummingbird Ventures Management NV (18.57%, Schedule 13D/A, filed 2026-11-09), Krishna Kittu Kolluri ("Kolluri") (10.6%, Schedule 13G, filed 2026-02-13), Oguzhan Atay (7.3%, Schedule 13G, filed 2026-02-17) and David Tsao (6.9%, Schedule 13G, filed 2026-02-17).
Who are the largest shareholders of BillionToOne, Inc.?
By the share each holder's latest filing reports, the largest holders of BillionToOne, Inc. on this page are Hummingbird Ventures Management NV (18.57%), Krishna Kittu Kolluri ("Kolluri") (10.6%) and Oguzhan Atay (7.3%).
When did Hummingbird Ventures Management NV buy into BillionToOne, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Hummingbird Ventures Management NV on this page is the Schedule 13D, filed 2026-01-20, reporting 19.6%; its latest, Schedule 13D/A filed 2026-11-09, reports 18.57%.
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%); 5 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.
Also on the record for BillionToOne, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 6, 2025 | IPO filing, Form 424B4 | $60 a share | IPO filings | Source |
| October 17, 2025 | IPO filing, Form S-1/A | $49 to $55 a share | IPO filings | Source |
| October 7, 2025 | IPO filing, Form S-1 | — | IPO filings | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.