Oguzhan Atay insider trades: BillionToOne (BLLN) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Oguzhan reports to the SEC
Open-market buys and sales
19 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Nov 2, 2026 | BLLN | ↓ Sell | 25,001 | $109.24 | $2.7M | Direct | Nov 4, 2026 (2d) |
| Nov 2, 2026 | BLLN | ↓ Sell | 5,334 | $113.17 | $604K | By spouse | Nov 4, 2026 (2d) |
| Oct 28, 2026 | BLLN | ↓ Sell | 8,333 | $118.00 | $983K | Direct | Oct 30, 2026 (2d) |
| Oct 28, 2026 | BLLN | ↓ Sell | 2,667 | $118.00 | $315K | By spouse | Oct 30, 2026 (2d) |
| Oct 15, 2026 | BLLN | ↓ Sell | 8,333 | $99.51 | $829K | Direct | Oct 16, 2026 (1d) |
| Oct 14, 2026 | BLLN | ↓ Sell | 2,667 | $98.00 | $261K | By spouse | Oct 16, 2026 (2d) |
| Oct 12, 2026 | BLLN | ↓ Sell | 16,667 | $93.79 | $1.6M | Direct | Oct 14, 2026 (2d) |
| Oct 12, 2026 | BLLN | ↓ Sell | 2,667 | $97.61 | $260K | By spouse | Oct 14, 2026 (2d) |
| Sep 28, 2026 | BLLN | ↓ Sell | 8,333 | $120.64 | $1.0M | Direct | Sep 30, 2026 (2d) |
| Sep 28, 2026 | BLLN | ↓ Sell | 2,666 | $120.64 | $322K | By spouse | Sep 30, 2026 (2d) |
| Sep 14, 2026 | BLLN | ↓ Sell | 24,999 | $100.32 | $2.5M | Direct | Sep 16, 2026 (2d) |
| Sep 14, 2026 | BLLN | ↓ Sell | 5,332 | $98.00 | $523K | By spouse | Sep 16, 2026 (2d) |
| Aug 5, 2026 | BLLN | ↓ Sell | 15,539 | $150.03 | $2.3M | Direct | Aug 7, 2026 (2d) |
| Aug 3, 2026 | BLLN | ↓ Sell | 32,500 | $136.95 | $4.5M | Direct | Aug 5, 2026 (2d) |
| Aug 3, 2026 | BLLN | ↓ Sell | 12,500 | $137.37 | $1.7M | By spouse | Aug 5, 2026 (2d) |
| Jul 6, 2026 | BLLN | ↓ Sell | 26,250 | $122.05 | $3.2M | Direct | Jul 8, 2026 (2d) |
| Jul 6, 2026 | BLLN | ↓ Sell | 12,500 | $122.05 | $1.5M | By spouse | Jul 8, 2026 (2d) |
| Jun 8, 2026 | BLLN | ↓ Sell | 26,250 | $97.66 | $2.6M | Direct | Jun 10, 2026 (2d) |
| Jun 8, 2026 | BLLN | ↓ Sell | 12,500 | $98.22 | $1.2M | By spouse | Jun 10, 2026 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other BLLN insiders
Open-market trades in the last 12 months
About Oguzhan Atay's insider trades
Oguzhan Atay is Chairman and CEO at BillionToOne (BLLN). Since Jun 8, 2026, Oguzhan has reported no open-market purchases and 19 sales worth $28.9M on SEC Form 4. In the last 12 months: 19 sales ($28.9M).
Their filings also include option exercises (10 filings), conversions (2 filings), gifts (1 filing), other transactions (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every BLLN insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.