Humming Bird Ventures Management NV - 30 Sep 2026 SCHEDULE 13D/A Report for BillionToOne, Inc. Class A common stock (BLLN)

Filing manager: Humming Bird Ventures Management NV
Reporting owner: Firat Ileri
Security: BillionToOne, Inc. Class A common stock
Beneficially owned shares: 8,034,797 shares
Large-stake signal: Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Ownership
19%
Beneficial ownership of this reported class.
Shares
8,034,797 shares
Shares beneficially owned as disclosed.
Event date
30 Sep 2026
Date tied to the ownership event or amendment.
Accepted by SEC
09 Nov 2026
EDGAR acceptance date.
How to read this large-stake filing
Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
Compare this filing with the holder history and issuer page before treating the percentage as a current position.
Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership: 19%
Symbol: BLLN
Shares outstanding: 43,267,620 shares
SEC form: SCHEDULE 13D/A
Accepted by SEC: 09 Nov 2026, 06:03:12 UTC
Event date: 30 Sep 2026
Prior SEC filing: 20 Jan 2026
Source filing: View source filing

Filing notes and source

Key filing fact

Humming Bird Ventures Management NV disclosed 19% ownership in BillionToOne, Inc. Class A common stock (BLLN) on 30 Sep 2026.

Key facts

Humming Bird Ventures Management NV filed SCHEDULE 13D/A for BillionToOne, Inc. Class A common stock (BLLN).
Disclosed ownership: 19%.
Date of event: 30 Sep 2026.

This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

Reporting persons

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name	Ownership	Shares owned	Sole voting power	Shared voting power	Signature	Title	CIK
Hummingbird Ventures Management NV	18%	8,003,039	0	8,003,039	/s/ Lukas Decoster	By: 49/9 CommV, its Director; By: Lukas Decoster, Permanent Representative	0002099044
Hummingbird Opportunity Fund II CommV	6.1%	2,631,664	0	2,631,664	/s/ Firat Ileri	By: Hummingbird Ventures Management NV, its Manager; By: Firat Ileri, Permanent Representative
Hummingbird Ventures III CommV	6.2%	2,669,141	0	2,669,141	/s/ Firat Ileri	By: Hummingbird Ventures Management NV, its Manager; By: Firat Ileri, Permanent Representative
Hummingbird Dragons CommV	4.7%	2,015,118	0	2,015,118	/s/ Firat Ileri	By: Hummingbird Ventures Management NV, its Manager; By: Firat Ileri, Permanent Representative
Hummingbird Collective CommV	0.04%	18,845	0	18,845	/s/ Firat Ileri	By: Hummingbird Ventures Management NV, its Manager; By: Firat Ileri, Permanent Representative
HB&Q NV	1.5%	640,727	0	640,727	/s/ Firat Ileri	By: Hummingbird Ventures Management NV, its Manager; By: Firat Ileri, Permanent Representative
Nomads Partnership	0.06%	27,544	0	27,544	/s/ Firat Ileri	By: Hummingbird Ventures Management NV, its Manager; By: Firat Ileri, Permanent Representative
Firat Ileri	19%	8,034,797	31,758	8,003,039	/s/ Firat Ileri	Firat Ileri
Barend Van den Brande	18%	8,003,039	0	8,003,039	/s/ Barend Van den Brande	Barend Van den Brande
Lukas Decoster	18%	8,003,039	0	8,003,039	/s/ Lukas Decoster	Lukas Decoster

CIK / CUSIP context first

Broader feeds