Skip to content

Oguzhan Atay, Chairman and CEO at BillionToOne, sold BLLN on Sep 14, 2026

Data as of Oct 16

▼ SELL$319K3,143 shares at $101.49Oguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.
Watch BLLN
Traded
Sep 14, 2026
Disclosed
Sep 16, 2026
Filed
2 days 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 Sep 14, 2026TRADEDDISCLOSED
BLLNSimilar stocks (XLV — its sector index fund), rebased to BLLN's price on the disclosure day
BLLN since disclosure
−5.3%
after the sale
Similar stocks (XLV) since disclosure
+5.3%
XLV — its sector index fund

Change in closing price from Sep 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.$203Kdisclosed Sep 16 · filed 2 days after the trade
  2. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$261Kdisclosed Sep 16 · filed 2 days after the trade
  3. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$149Kdisclosed Sep 16 · filed 2 days after the trade
  4. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$255Kdisclosed Sep 16 · filed 2 days after the trade
  5. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$166Kdisclosed Sep 16 · filed 2 days after the trade
  6. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$245Kdisclosed Sep 16 · filed 2 days after the trade
  7. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$440Kdisclosed Sep 16 · filed 2 days after the trade
  8. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$732Kdisclosed Sep 16 · filed 2 days after the trade

See every trade on BLLN →