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BLLN SCHEDULE 13D/A: SEC filing

Hummingbird Ventures Management NV and affiliated entities

Filed with the SEC on · accession 0001104659-26-124070

BLLN filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Nov 9, 2026. Hummingbird Ventures Management NV and affiliated entities filed an amended Schedule 13D disclosing beneficial ownership of approximately 18.49% of BillionToOne's Class A common stock, with individual Firat Ileri reporting 18.57% including RSUs. The stock moved +0.9% by the first close after the filing.

Summary of the filing

Hummingbird Ventures Management NV and affiliated entities filed an amended Schedule 13D disclosing beneficial ownership of approximately 18.49% of BillionToOne's Class A common stock, with individual Firat Ileri reporting 18.57% including RSUs. The filing is a routine ownership update with no stated change in intent or control purpose.

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Key details

Shares of Class A common stock beneficially owned by Hummingbird Ventures Management NV$8.0M
Shares of Class A common stock beneficially owned by Hummingbird Opportunity Fund II CommV$2.6M
Shares of Class A common stock beneficially owned by Hummingbird Ventures III CommV$2.7M
Shares of Class A common stock beneficially owned by Hummingbird Dragons CommV$2.0M
Shares of Class A common stock beneficially owned by Hummingbird Collective CommV$19K
Shares of Class A common stock beneficially owned by HB&Q NV$641K
Shares of Class A common stock beneficially owned by Nomads Partnership$28K
Total shares of Class A common stock beneficially owned by Firat Ileri$8.0M
Total shares of Class A common stock outstanding as of November 2, 2026$43.3M
Issuer / subject companyBillionToOne, Inc.
Reporting person / filerHummingbird Ventures Management NV
Reporting person / affiliated fundHummingbird Opportunity Fund II CommV
Reporting person / affiliated fundHummingbird Ventures III CommV
Reporting person / affiliated fundHummingbird Dragons CommV
Reporting person / affiliated fundHummingbird Collective CommV
Reporting person / affiliated entityHB&Q NV
Reporting person / affiliated entityNomads Partnership
Reporting person / individual holderFirat Ileri
Reporting person / individual holderBarend Van den Brande
Reporting person / individual holderLukas Decoster

How BLLN stock reacted

Close before

$113.94

Nov 6, 2026

First close after

+0.89%

$114.95

5 trading days

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Since filing

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Frequently asked questions

What did BLLN file with the SEC on Nov 9, 2026?

BLLN filed a SCHEDULE 13D/A (SEC filing). Hummingbird Ventures Management NV and affiliated entities filed an amended Schedule 13D disclosing beneficial ownership of approximately 18.49% of BillionToOne's Class A common stock, with individual Firat Ileri reporting 18.57% including RSUs. The filing is a routine ownership update with no stated change in intent or control purpose.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did BLLN stock react to this filing?

BLLN closed at $113.94 before the filing and $114.95 on Nov 9, 2026 (+0.89%).

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