BillionToOne, Inc. - Class A common stock, par value $0.00001 per share (BLLN)

Q: What does CUSIP 090168105 represent in this 13F holders report?

CUSIP 090168105 is the security identifier for BLLN - BillionToOne, Inc. - Class A common stock, par value $0.00001 per share used to aggregate holder disclosures.

Q: How many institutions held BLLN - BillionToOne, Inc. - Class A common stock, par value $0.00001 per share in Q4 2025?

90 institutional investors reported BLLN - BillionToOne, Inc. - Class A common stock, par value $0.00001 per share for Q4 2025. Use the holders table for investor-level position and value details.

CUSIP: 090168105

Q4 2025 13F Holders as of 31 Dec 2025

Security type / class: Equity / Class A common stock, par value $0.00001 per share
Total 13F shares: 9,651,437
Total 13F value: $789,938,363
Share change: +8,551,005
SEC-reported price per share: $81.84
Number of holders: 90
Value change: +$699,879,009
Number of buys: 87
Shares outstanding: 43,996,623

Security key

090168105

Report period

Q4 2025

Institutions

Top holders

BLLN full security history Ownership snapshot Full 13F holder table Newer quarter: Q1 2026 BillionToOne, Inc. SEC filings BillionToOne, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 090168105

Newer quarter: Q1 2026

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025

Ownership snapshot

Top reported holders of BLLN - BillionToOne, Inc. - Class A common stock, par value $0.00001 per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Humming Bird Ventures Man...

Disclosed value leader

Humming Bird Ventures Man...

Comparable rows

4/7

Latest evidence

31 Dec 2025

13D/G 3/4/5 Lead comparable stake: 20% 3 rows are not safely comparable across share classes. 13D/G row: Humming Bird Ventures Management NV Showing 1-6 of 7 holder rows.

Quick read

Humming Bird Ventures Management NV leads the comparable SEC ownership view at 20%.

4 of 7 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Humming Bird Ventures Management NV's linked filing trail.

Comparable ownership Top 4

Humming Bird Ventures Management NV 20%

NeoTribe Ventures I, L.P. 11%

Oguzhan Atay 7.3%

David Tsao 6.9%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 7 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Humming Bird Ventures Management NV	13D/G 3/4/5 Hummingbird Ventures Management NV · 10%+ Owner 13D/G 3/4/5	20%	$645,491,476 7,887,237 shares	$0	06 Nov 2025
NeoTribe Ventures I, L.P.	13D/G Krishna Kittu Kolluri ("Kolluri") 13D/G	11%	$422,218,059 4,359,505 shares	$0	07 Nov 2025
Oguzhan Atay	13D/G 13D/G	7.3%	$310,584,488 3,206,861 shares	$0	31 Dec 2025
David Tsao	13D/G 13D/G	6.9%	$294,014,034 3,035,767 shares	$0	31 Dec 2025
John Lister	3/4/5 Chief Administrative Officer 3/4/5	— class O/S missing	— 133,300 shares	—	07 Nov 2025
Ross Taylor	3/4/5 Chief Financial Officer 3/4/5	— class O/S missing	— 75,000 shares	—	07 Nov 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

9,651,437

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q4 2025 vs Q1 2026 Across Filers

Q1 2026 holders

Q4 2025 holders

Holder diff

Investor	Q1 2026 Shares	Q4 2025 Shares	Share Diff	Share Chg %	Q1 2026 value	Q4 2025 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend