StockCIK 2070849

BillionToOne, Inc. (BLLN): Insider Trades and Fund Holdings

In the past 12 months, BillionToOne, Inc. insiders reported 0 open-market purchases worth $0 and 20 sales worth $19.6M; 20 of the sales were reported as made under a 10b5-1 trading plan.

0Insider buys, 12 months

$0Bought by insiders, 12 months

$19.6MSold by insiders, 12 months

1Tracked funds holding

Recent insider trades

Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Oct 16, 2026.

Recent BLLN insider trades
Filed	Traded	Insider	Role	Type	Shares	Price ($)	Value	Holding	Filing
Oct 16	Oct 15	Oguzhan AtayCEO	CEO	▼ SELL10b5-1	5,150	100.23	$516K	All sold	Form 4 ↗
Oct 16	Oct 14	Oguzhan AtayCEO	CEO	▼ SELL10b5-1	3,183	98.34	$313K	All sold	Form 4 ↗
Oct 16	Oct 14	Oguzhan AtayCEO	CEO (ind.)	▼ SELL10b5-1	2,667	98.00	$261K	−1.8%	Form 4 ↗
Oct 14	Oct 12	Oguzhan AtayCEO	CEO	▼ SELL10b5-1	16,667	93.79	$1.56M	All sold	Form 4 ↗
Oct 14	Oct 12	Oguzhan AtayCEO	CEO (ind.)	▼ SELL10b5-1	2,667	97.61	$260K	−1.7%	Form 4 ↗
Oct 7	Oct 5	David TsaoCTO	CTO	▼ SELL10b5-1	20,000	108.15	$2.16M	−72%	Form 4 ↗
Oct 7	Oct 5	Bosch John Roderick TenSVP	SVP	▼ SELL10b5-1	2,834	105.15	$298K	−13%	Form 4 ↗
Sep 30	Sep 28	Oguzhan AtayCEO	CEO	▼ SELL10b5-1	8,333	120.64	$1.01M	All sold	Form 4 ↗
Sep 30	Sep 28	Oguzhan AtayCEO	CEO (ind.)	▼ SELL10b5-1	2,666	120.64	$322K	−1.7%	Form 4 ↗
Sep 28	Sep 24	David TsaoCTO	CTO	▼ SELL10b5-1	3,333	125.00	$417K	−77%	Form 4 ↗

Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings

All 20 BLLN insider trades →

Insiders who traded in the past year

Insider	Role	Bought	Sells	Sold	Latest
Oguzhan Atay	CEO	$0	9	$7.27M	Oct 16, 2026
David Tsao	CTO	$0	4	$5.55M	Oct 7, 2026
Bosch John Roderick Ten	SVP	$0	5	$899K	Oct 7, 2026
Thomas P. Lynch	See Remarks	$0	2	$5.87M	Sep 21, 2026

Tracked funds that report BLLN

From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.

Fund	Quarter	Shares	Value	% of portfolio	Change
Renaissance Technologies	Q2 2026	96,600	$11.6M	0.02%	▲ +88.5%
Soros Fund Management	Q2 2026	0	$0	0.00%	▼ Sold out

Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings

Reading these numbers

Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →