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Oguzhan Atay, Chairman and CEO at BillionToOne, sold BLLN on Oct 12, 2026

Data as of Oct 16

▼ SELL$633K6,763 shares at $93.65Oguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.
Watch BLLN
Traded
Oct 12, 2026
Disclosed
Oct 14, 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 Oct 12, 2026TRADEDDISCLOSED
BLLNSimilar stocks (XLV — its sector index fund), rebased to BLLN's price on the disclosure day
BLLN since disclosure
+0.2%
after the sale
Similar stocks (XLV) since disclosure
+1.6%
XLV — its sector index fund

Change in closing price from Oct 14, 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.$366Kdisclosed Oct 14 · filed 2 days after the trade
  2. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$260Kdisclosed Oct 14 · filed 2 days after the trade
  3. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$238Kdisclosed Oct 14 · filed 2 days after the trade
  4. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$147Kdisclosed Oct 14 · filed 2 days after the trade
  5. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$180Kdisclosed Oct 14 · filed 2 days after the trade

See every trade on BLLN →