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Oguzhan Atay, Chairman and CEO at BillionToOne, sold BLLN on Oct 15, 2026

Data as of Oct 16

▼ SELL$128K1,276 shares at $100.60Oguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.
Watch BLLN
Traded
Oct 15, 2026
Disclosed
Oct 16, 2026
Filed
1 day after the trade

Form 4s are due within two business days.

Official filing (SEC Form 4) ↗

The price around the disclosure

Oguzhan Atay, Chairman and CEO at BillionToOne, sold BLLN on Oct 15, 2026TRADEDDISCLOSED
BLLNSimilar stocks (XLV — its sector index fund), rebased to BLLN's price on the disclosure day
BLLN since disclosure
0.0%
after the sale
Similar stocks (XLV) since disclosure
0.0%
XLV — its sector index fund

Change in closing price from Oct 16, 2026 (the first trading day on or after disclosure) to Oct 16, 2026. Dividends excluded. Not a return anyone earned.

Our take

None of our tested rules fired on this trade.

Other trades in the same filing

  1. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$99.8Kdisclosed Oct 16 · filed 1 day after the trade
  2. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$13.7Kdisclosed Oct 16 · filed 1 day after the trade
  3. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$186Kdisclosed Oct 16 · filed 1 day after the trade
  4. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$88.6Kdisclosed Oct 16 · filed 1 day after the trade
  5. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$9.9Kdisclosed Oct 16 · filed 2 days after the trade
  6. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$303Kdisclosed Oct 16 · filed 2 days after the trade
  7. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$261Kdisclosed Oct 16 · filed 2 days after the trade

See every trade on BLLN →