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Oguzhan Atay, Chairman and CEO at BillionToOne, sold BLLN on Sep 28, 2026

Data as of Oct 16

▼ SELL$1M8,333 shares at $120.64Oguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.
Watch BLLN
Traded
Sep 28, 2026
Disclosed
Sep 30, 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 28, 2026TRADEDDISCLOSED
BLLNSimilar stocks (XLV — its sector index fund), rebased to BLLN's price on the disclosure day
BLLN since disclosure
−7.8%
after the sale
Similar stocks (XLV) since disclosure
+4.9%
XLV — its sector index fund

Change in closing price from Sep 30, 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.$322Kdisclosed Sep 30 · filed 2 days after the trade

See every trade on BLLN →