As of November 10, 2026, BillionToOne, Inc. is a publicly traded company (Nasdaq: BLLN). The largest holder reporting an active stake on Schedule 13D is Hummingbird Ventures Management NV, at 18.57%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Krishna Kittu Kolluri (10.6%), Oguzhan Atay (7.3%), David Tsao (6.9%) (Schedule 13D/A, November 9, 2026).
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Is BillionToOne, Inc. a real, registered company?
- BillionToOne, Inc. files with the SEC under CIK 2070849 (its SEC filings).
- Its shares are listed under the ticker BLLN on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in Menlo Park, 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 BillionToOne, Inc. in our court records and SEC 8-K records (as of 2026-11-10).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Hummingbird Ventures Management NV (filed 2026-11-09).
Who are BillionToOne, Inc.'s owners and officers?
BillionToOne, Inc.: incorporated in Delaware; business address in Menlo Park, California; industry Services-Medical Laboratories (Schedule 13D/A, 2026-11-09).
| Report | Holder | Share |
|---|---|---|
| Schedule 13D/A, 2026-11-09 | Hummingbird Ventures Management Nv | 18.57% |
| Schedule 13G, 2026-02-17 | Oguzhan Atay | 7.3% |
| Schedule 13G, 2026-02-17 | David Tsao | 6.9% |
| Schedule 13G, 2026-02-13 | Krishna Kittu Kolluri ("Kolluri") | 10.6% |
| Schedule 13D, 2026-01-20 | Hummingbird Ventures Management Nv | 19.6% |
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.
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What the Full Report on BillionToOne, Inc. covers
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Which insiders own BillionToOne, Inc. 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.
- HB&Q NV (HB&Q Compartment III), a 10% owner: 2,580,833 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-01-20).
- Hummingbird Opportunity Fund II CommV, a 10% owner: 2,580,833 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-01-20).
- Hummingbird Ventures III CommV, a 10% owner: 2,580,833 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-01-20).
- , a 10% owner: 2,580,833 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-01-20).
- , a 10% owner: 2,580,833 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-01-20).
Shares only: the company's cover page does not give one share count for a single class, so no percentage is worked out.
How much has BillionToOne, Inc. raised?
Latest IPO step: BillionToOne, Inc. filed its final IPO prospectus, ticker BLLN (424B4, 2025-11-06).
IPO filings: 424B4, 2025-11-06, S-1/A, 2025-10-17, S-1, 2025-10-07; ticker BLLN on Nasdaq Global Select Market.
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More on BillionToOne, Inc. and the records around it.
BillionToOne, Inc. elsewhere on the record
- 5%+ stake filings Nov 2026
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