Oguzhan Atay Insider Trades & Stock Holdings

Chairman and CEO · BillionToOne, Inc. · Latest filing Oct 15, 2026

Oguzhan Atay, Chairman and CEO at BillionToOne, Inc. has 2 Form 4 trades on file since Oct 14, 2026. Open-market activity: 0 purchases ($0) and 2 sales ($1.09M), net -$1.09M. Latest filing: disposed of 5.15K shares of $BLLN on Oct 15, 2026 at $100.23.

Trades on file

2

Open-market bought

$0

Open-market sold

$1.09M

Net open-market

-$1.09M

Shares held ($BLLN)

Latest filing

Oct 15, 2026

Shares held by Oguzhan Atay

• $BLLN— sh

Shares owned after the most recent Form 4 for each company.

All insider trades by Oguzhan Atay

Date	Ticker	Type	Shares	Price	Value	Owned after	ΔOwn	1W	1M	6M	Role	Filing	Story
Oct 15, 2026	$BLLN	Sell (Open-market sale) 10b5-1	5.15K	$100.23	$516.19K	—	-100%				Chairman and CEO	SEC	Read
Oct 14, 2026	$BLLN	Sell (Open-market sale) 10b5-1	5.85K	$98.19	$574.39K	—	-100%				Chairman and CEO	SEC	Read

"Buy" means shares acquired on the Form 4 (including grants and option exercises); "Sell" means shares disposed. 1W / 1M / 6M = how the stock moved after the trade.

Stocks Oguzhan Atay traded

• $BLLN

Frequently asked questions

Has Oguzhan Atay been buying or selling stock?

Oguzhan Atay has 0 open-market purchases and 2 open-market sales on file, net -$1.09M. Grants, option exercises and tax withholding are listed separately because they are not open-market trades.

What was Oguzhan Atay's latest insider trade?

disposed of 5.15K shares of $BLLN on Oct 15, 2026 at $100.23.

Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.