BLLN · Insider Trading

BillionToOne, Inc. Class A Common Stock

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Every open-market purchase and sale reported by BLLN officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Form 4 Filings

most recent

Open-Market Buys

code P

Sales

code S

Reporting Insiders

current holders

BLLN — Recent Form 4 Transactions (latest 2026-10-19)

Filed	Insider	Role	Type	Shares	Value
2026-10-19	Thomas P. Lynch	See Remarks	M	+2,000	+$17.30K
2026-10-16	Oguzhan Atay	Chairman and CEO	MIXED	−2,667	−$1.07M
2026-10-14	Oguzhan Atay	Chairman and CEO	MIXED	−2,667	−$1.78M
2026-10-13	Thomas P. Lynch	See Remarks	M	+8,000	+$69.20K
2026-10-07	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−2,834	−$298.00K
2026-10-07	David Tsao	Chief Technology Officer	MIXED	—	−$2.11M
2026-09-30	Oguzhan Atay	Chairman and CEO	MIXED	−2,666	−$1.30M
2026-09-28	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−1,416	−$169.92K
2026-09-28	David Tsao	Chief Technology Officer	MIXED	—	−$407.29K
2026-09-23	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−1,416	−$150.96K
2026-09-21	Thomas P. Lynch	See Remarks	MIXED	—	−$3.40M
2026-09-16	Oguzhan Atay	Chairman and CEO	MIXED	−5,332	−$2.96M
2026-09-14	Shan Riku Sakakibara	Chief Product Officer	G	−3,500	—
2026-09-11	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−1,416	−$138.12K
2026-09-11	David Tsao	Chief Technology Officer	MIXED	—	−$1.92M
2026-09-10	Oguzhan Atay	Chairman and CEO	MIXED	—	—
2026-09-10	Thomas P. Lynch	See Remarks	MIXED	—	−$1.73M
2026-09-08	David Tsao	Chief Technology Officer	MIXED	—	—
2026-08-28	Krishna Kittu Kolluri	Director	J	−406,198	—
2026-08-27	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−1,417	−$141.70K
2026-08-27	David Tsao	Chief Technology Officer	MIXED	—	−$972.00K
2026-08-12	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−1,417	−$131.58K
2026-08-12	David Tsao	Chief Technology Officer	MIXED	—	−$900.60K
2026-08-07	Oguzhan Atay	Chairman and CEO	MIXED	—	−$2.29M
2026-08-07	Oguzhan Atay	Chairman and CEO	MIXED	—	−$2.29M
2026-08-05	Oguzhan Atay	Chairman and CEO	MIXED	−12,500	−$6.08M
2026-08-04	Shan Riku Sakakibara	Chief Product Officer	Sell	−4,000	−$560.84K
2026-07-20	Nancy JoAnn Johnson	See Remarks	Sell	−14,199	−$1.82M
2026-07-15	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−4,251	−$533.33K
2026-07-15	David Tsao	Chief Technology Officer	MIXED	—	−$2.44M
2026-07-13	Shan Riku Sakakibara	Chief Product Officer	MIXED	−4,000	−$880.73K
2026-07-13	Oguzhan Atay	Chairman and CEO	MIXED	—	−$1.54M
2026-07-08	Oguzhan Atay	Chairman and CEO	MIXED	−12,500	−$4.66M
2026-07-06	Nancy JoAnn Johnson	See Remarks	Sell	−801	−$100.06K
2026-07-01	John Roderick ten Bosch	SVP of Laboratory Operations	Sell	−1,416	−$169.92K
2026-06-26	Shan Riku Sakakibara	Chief Product Officer	MIXED	−4,000	−$845.40K
2026-06-17	John Roderick ten Bosch	See Remarks	Sell	−2,832	−$287.36K
2026-06-17	David Tsao	Chief Technology Officer	MIXED	—	−$1.99M
2026-06-12	Akshay Rai	Director	A	+3,017	—
2026-06-12	Anthony Pagano	Director	A	+3,017	—
2026-06-12	Krishna Kittu Kolluri	Director	A	+3,017	—
2026-06-12	Firat Ileri	Director	A	+3,017	—
2026-06-12	Thomas S Bremner	Director	A	+3,017	—
2026-06-11	NeoTribe Ventures I, L.P.	10%+ Owner	J	−3,051,657	—
2026-06-11	Krishna Kittu Kolluri	Director	J	−419,751	—
2026-06-10	Shan Riku Sakakibara	Chief Product Officer	Sell	−8,000	−$785.80K
2026-06-10	Nancy JoAnn Johnson	See Remarks	Sell	−14,000	−$1.40M
2026-06-10	Oguzhan Atay	See Remarks	MIXED	−12,500	−$3.72M
2026-05-13	NeoTribe Partners I, LLC	10%+ Owner	J	−3,051,657	—
2026-05-13	Krishna Kittu Kolluri	Director	J	−419,751	—

BLLN — Current Insider Holders

Insider	Role	Shares Held	Value
NeoTribe Partners I, LLC	10%+ Owner	2,439,258	$255.32M
Shan Riku Sakakibara	Chief Product Officer	196,500	$20.57M
Oguzhan Atay	Chairman and CEO	149,268	$15.62M
NeoTribe Ventures I, L.P.	10%+ Owner	92,785	$9.71M
Krishna Kittu Kolluri	Director	69,189	$7.24M
Firat Ileri	Director	40,331	$4.22M
John Roderick ten Bosch	SVP of Laboratory Operations	20,802	$2.18M
Collective CommV Hummingbird	10%+ Owner	18,845	$1.97M
Akshay Rai	Director	14,026	$1.47M
Thomas S Bremner	Director	11,350	$1.19M
Thomas P. Lynch	See Remarks	10,700	$1.12M
Anthony Pagano	Director	7,913	$828.25K
Nancy JoAnn Johnson	See Remarks	7,806	$817.05K
David Tsao	Chief Technology Officer	2,929	$306.58K

BLLN Insider Trading FAQ

Who are the insiders at BLLN?

14 officers, directors and 10%+ beneficial owners currently report holdings in BLLN via SEC Form 4.

Are BLLN insiders buying or selling?

Across the 50 most recent Form 4 filings for BLLN, 0 were open-market purchases (code P) and 14 were sales (code S). Sales frequently reflect scheduled 10b5-1 plans or tax withholding rather than a view on the stock.

How current is BLLN insider data?

Form 4 must be filed within two business days of the transaction, so this is close to real time. The most recent BLLN filing is dated 2026-10-19.

How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the BLLN quote page; the site-wide leaderboard is on the insider transactions hub.