Insider Transactions Reported by 21 Insiders of BillionToOne, Inc.

Symbol: BLLN on Nasdaq
Location: Menlo Park, CA

Key facts

BLLN - BillionToOne, Inc. has 21 insiders with reported activity on this page.
No net insider buy/sell flow is currently reported for the last year.
Recent transaction rows are available for direct filing-level review.

Change

No meaningful buy/sell imbalance is currently visible in the one-year window.
Activity will update as new Forms 3/4/5 are filed.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 23 May 2025.

Buys

Shares: 0

Insiders: 0

Sells

Shares: 0

Insiders: 0

Net

Shares: 0

Insiders: 0

Window (months)	Buy $	Sell $	Net $
0-3	$0	$0	$0
3-6	$0	$0	$0
6-9	$0	$0	$0
9-12	$0	$0	$0

BillionToOne, Inc. executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Valuation	Report Date
NeoTribe Partners I, LLC	10%+ Owner	$7,758,460	Median	11 May 2026
Neotribe Ignite Partners I, LLC	10%+ Owner	$7,758,460	Median	11 May 2026
Neotribe Partners SPV I BTO, LLC	10%+ Owner	$7,758,460	Median	11 May 2026
NeoTribe Ventures I, L.P.	10%+ Owner	$7,758,460	Median	11 May 2026
Neotribe Ignite Fund I, L.P.	10%+ Owner	$7,758,460	Median	11 May 2026
Neotribe SPV I BTO, LLC	10%+ Owner	$7,758,460	Median	11 May 2026
NeoTribe Associates I, L.P.	10%+ Owner	$7,758,460	Median	11 May 2026
Krishna Kittu Kolluri	Director, 10%+ Owner	$1,165,312	Median	11 May 2026
Humming Bird Ventures Management NV	10%+ Owner	$0	Mixed	07 Nov 2025
Firat Ileri	Director, 10%+ Owner		Mixed	06 Nov 2025
Shan Riku Sakakibara	Chief Product Officer		Mixed	07 Nov 2025
Nancy JoAnn Johnson	Senior Vice President of Sales and Commercial Operations		Mixed	07 Nov 2025
Bosch John Roderick Ten	Senior Vice President of Laboratory Operations		Mixed	07 Nov 2025
Anthony Pagano	Director		Mixed	01 Jan 2026
Akshay Rai	Director		Mixed	07 Nov 2025
Thomas S. Bremner	Director		Mixed	06 Nov 2025
John Lister	Chief Administrative Officer		Mixed	07 Nov 2025
Thomas P. Lynch	General Counsel, Chief Compliance Officer and Secretary		Mixed	07 Nov 2025
Oguzhan Atay	Chairman and Chief Executive Officer, Director		Mixed	07 Nov 2025
Ross Taylor	Chief Financial Officer		Mixed	07 Nov 2025
David Tsao	Chief Technology Officer, Director		Mixed	07 Nov 2025

Top shareholders of BillionToOne, Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: 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.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Humming Bird Ventures Management NV	13D/G 3/4/5	Hummingbird Ventures Management NV · 10%+ Owner	20%	7,887,237	$645,491,476	$0	06 Nov 2025	13D/G 3/4/5
NeoTribe Ventures I, L.P.	13D/G 3/4/5	Krishna Kittu Kolluri ("Kolluri") · 10%+ Owner	11%	4,359,505	$422,218,059	$0	07 Nov 2025	13D/G 3/4/5
Oguzhan Atay	13D/G 3/4/5	Chairman and Chief Executive Officer, Director	7.3%	3,206,861	$310,584,488	$0	31 Dec 2025	13D/G 3/4/5
David Tsao	13D/G 3/4/5	Chief Technology Officer, Director	6.9%	3,035,767	$294,014,034	$0	31 Dec 2025	13D/G 3/4/5
NeoTribe Associates I, L.P.	3/4/5	10%+ Owner	0.22%	98,283	$7,758,460	—	11 May 2026	3/4/5
Neotribe Ignite Fund I, L.P.	3/4/5	10%+ Owner	0.22%	98,283	$7,758,460	—	11 May 2026	3/4/5
Neotribe Ignite Partners I, LLC	3/4/5	10%+ Owner	0.22%	98,283	$7,758,460	—	11 May 2026	3/4/5
NeoTribe Partners I, LLC	3/4/5	10%+ Owner	0.22%	98,283	$7,758,460	—	11 May 2026	3/4/5
Neotribe Partners SPV I BTO, LLC	3/4/5	10%+ Owner	0.22%	98,283	$7,758,460	—	11 May 2026	3/4/5
Neotribe SPV I BTO, LLC	3/4/5	10%+ Owner	0.22%	98,283	$7,758,460	—	11 May 2026	3/4/5
ADAMS STREET PARTNERS LLC	13F	Company	3.9%	1,711,430	$135,100,284	—	31 Mar 2026	13F
BAILLIE GIFFORD & CO	13F	Company	2.9%	1,259,993	$99,463,846	—	31 Mar 2026	13F
Civilization Ventures Management, LLC	13F	Company	2.5%	1,099,431	$86,798,083	—	31 Mar 2026	13F
BAMCO INC /NY/	13F	Company	1.7%	741,485	$58,532,826	—	31 Mar 2026	13F
PRICE T ROWE ASSOCIATES INC /MD/	13F	Company	1.7%	737,518	$58,221,000	—	31 Mar 2026	13F
Neuberger Berman Group LLC	13F	Company	1.6%	709,214	$37,813,064	—	31 Mar 2026	13F
NVP Associates, LLC	13F	Company	1.2%	513,330	$40,522,270	—	31 Mar 2026	13F
Invesco Ltd.	13F	Company	0.92%	406,512	$32,090,057	—	31 Mar 2026	13F
WASATCH ADVISORS LP	13F	Company	0.84%	369,638	$29,179,224	—	31 Mar 2026	13F
JPMORGAN CHASE & CO	13F	Company	0.64%	283,140	$19,850,946	—	31 Mar 2026	13F
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F	Company	0.55%	240,587	$18,991,938	—	31 Mar 2026	13F
EMERALD ADVISERS, LLC	13F	Company	0.54%	239,562	$18,911,024	—	31 Mar 2026	13F
Napean Trading & Investment Co (Singapore) PTE Ltd	13F	Company	0.53%	233,333	$18,419,307	—	31 Mar 2026	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	0.51%	223,251	$18,270,862	—	31 Mar 2026	13F
AMERIPRISE FINANCIAL INC	13F	Company	0.5%	220,035	$17,369,563	—	31 Mar 2026	13F
VANGUARD CAPITAL MANAGEMENT LLC	13F	Company	0.41%	182,463	$14,403,629	—	31 Mar 2026	13F
Capital International Investors	13F	Company	0.4%	178,000	$14,051,320	—	31 Mar 2026	13F
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	13F	Company	0.36%	159,573	$12,596,693	—	31 Mar 2026	13F
VANGUARD PORTFOLIO MANAGEMENT LLC	13F	Company	0.34%	151,213	$11,936,754	—	31 Mar 2026	13F
EMERALD MUTUAL FUND ADVISERS TRUST	13F	Company	0.3%	132,206	$10,436,342	—	31 Mar 2026	13F
Penn Capital Management Company, LLC	13F	Company	0.29%	126,335	$9,992,024	—	31 Mar 2026	13F
UBS Group AG	13F	Company	0.28%	121,604	$9,599,420	—	31 Mar 2026	13F
BlackRock, Inc.	13F	Company	0.22%	95,160	$7,511,930	—	31 Mar 2026	13F
PERCEPTIVE ADVISORS LLC	13F	Company	0.21%	91,812	$7,247,639	—	31 Mar 2026	13F
NEXT CENTURY GROWTH INVESTORS LLC	13F	Company	0.21%	90,564	$7,149,122	—	31 Mar 2026	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.2%	89,114	$7,036,788	—	31 Mar 2026	13F
NEW YORK STATE COMMON RETIREMENT FUND	13F	Company	0.2%	88,682	$7,000,557	—	31 Mar 2026	13F
PFM Health Sciences, LP	13F	Company	0.2%	88,069	$6,952,167	—	31 Mar 2026	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.19%	82,776	$6,534,337	—	31 Mar 2026	13F
Ensign Peak Advisors, Inc	13F	Company	0.12%	51,501	$4,065,489	—	31 Mar 2026	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	0.12%	51,254	$4,045,991	—	31 Mar 2026	13F
Deep Track Capital, LP	13F	Company	0.11%	50,000	$3,947,000	—	31 Mar 2026	13F
LORD, ABBETT & CO. LLC	13F	Company	0.1%	44,289	$3,496,000	—	31 Mar 2026	13F
TD ASSET MANAGEMENT INC	13F	Company	0.1%	43,108	$3,402,946	—	31 Mar 2026	13F
MANUFACTURERS LIFE INSURANCE COMPANY, THE	13F	Company	0.07%	30,506	$2,408,144	—	31 Mar 2026	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.06%	28,054	$2,214,583	—	31 Mar 2026	13F
VANGUARD FIDUCIARY TRUST CO	13F	Company	0.06%	27,791	$2,193,822	—	31 Mar 2026	13F
SEVEN GRAND MANAGERS, LLC	13F	Company	0.06%	25,000	$1,973,500	—	31 Mar 2026	13F
Squarepoint Ops LLC	13F	Company	0.05%	22,946	$1,811,357	—	31 Mar 2026	13F
Universal- Beteiligungs- und Servicegesellschaft mbH	13F	Individual	0.05%	20,595	$1,625,770	—	31 Mar 2026	13F

Recent Insider Transactions by Companies or Individuals for BillionToOne, Inc.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Shares	Shares Owned	Date	Ownership
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-74.2%	-281,949	98,283	11 May 2026	Direct
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other		14,828	7,980	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
NeoTribe Ventures I, L.P.	BLLN	Class A Common Stock	Other	-100%	-168,830	0	11 May 2026	See Footnote
Krishna Kittu Kolluri	BLLN	Class A Common Stock	Other		31,028	14,762	11 May 2026	See Footnote
Krishna Kittu Kolluri	BLLN	Class A Common Stock	Other	-100%	-450,779	0	11 May 2026	See Footnote
Anthony Pagano		Class A Common Stock	Award		4,896	4,896	01 Jan 2026	Direct
Humming Bird Ventures Management NV	BLLN	Class A Common Stock	Other		7,887,187	2,631,664	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Common Stock	Other	-100%	-7,887,187	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Common Stock	Conversion of derivative security		7,707,188	2,631,664	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series A-6 Convertible Preferred Stock	Conversion of derivative security	-100%	-2,260,520	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series A-2 Convertible Preferred Stock	Conversion of derivative security	-100%	-33,000	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series A-1 Convertible Preferred Stock	Conversion of derivative security	-100%	-20,000	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series D Convertible Preferred Stock	Conversion of derivative security	-100%	-446,103	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series C Convertible Preferred Stock	Conversion of derivative security	-100%	-1,706,303	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series B-1 Convertible Preferred Stock	Conversion of derivative security	-100%	-2,280,222	0	07 Nov 2025	See Footnotes
Humming Bird Ventures Management NV	BLLN	Series B-2 Convertible Preferred Stock	Conversion of derivative security	-100%	-961,090	0	07 Nov 2025	See Footnotes
Oguzhan Atay		Class A Common Stock	Other	-100%	-2,227,542	0	07 Nov 2025	Direct
Oguzhan Atay		Class A Common Stock	Other		200,000	200,000	07 Nov 2025	By spouse
Oguzhan Atay		Class A Common Stock	Other		2,227,542	2,227,542	07 Nov 2025	Direct
Oguzhan Atay		Common Stock	Other	-100%	-200,000	0	07 Nov 2025	By spouse
Oguzhan Atay		Common Stock	Other	-100%	-2,227,542	0	07 Nov 2025	Direct
Oguzhan Atay		Common Stock	Conversion of derivative security		262,434	262,434	07 Nov 2025	Direct
Oguzhan Atay		Stock Option (right to buy)	Other		1,643,102	1,003,102	07 Nov 2025	Direct
Oguzhan Atay		Stock Option (right to buy)	Other	-100%	-1,643,102	0	07 Nov 2025	Direct
Oguzhan Atay		Class B Common Stock	Other		2,227,542	2,227,542	07 Nov 2025	Direct
Oguzhan Atay		Series A-1 Convertible Preferred Stock	Conversion of derivative security	-100%	-262,434	0	07 Nov 2025	Direct
David Tsao		Class A Common Stock	Purchase		1,000	1,000	07 Nov 2025	Direct
David Tsao		Class A Common Stock	Other	-100%	-2,325,108	0	07 Nov 2025	Direct
David Tsao		Class A Common Stock	Other		2,325,108	2,325,108	07 Nov 2025	Direct
David Tsao		Common Stock	Other	-100%	-2,325,108	0	07 Nov 2025	Direct
David Tsao		Stock Option (right to buy)	Other		1,141,551	640,000	07 Nov 2025	Direct
David Tsao		Stock Option (right to buy)	Other	-100%	-1,141,551	0	07 Nov 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.