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Oguzhan Atay, Chairman and CEO at BillionToOne, sold BLLN on Aug 3, 2026

Data as of Oct 16

▼ SELL$5.8K43 shares at $135.41Oguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.
Watch BLLN
Traded
Aug 3, 2026
Disclosed
Aug 5, 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 Aug 3, 2026TRADEDDISCLOSED
BLLNSimilar stocks (XLV — its sector index fund), rebased to BLLN's price on the disclosure day
BLLN since disclosure
−34.6%
after the sale
Similar stocks (XLV) since disclosure
+7.6%
XLV — its sector index fund

Change in closing price from Aug 5, 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.$11.4Kdisclosed Aug 5 · filed 2 days after the trade
  2. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$1.4Mdisclosed Aug 5 · filed 2 days after the trade
  3. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$74.3Kdisclosed Aug 5 · filed 2 days after the trade
  4. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$105Kdisclosed Aug 5 · filed 2 days after the trade
  5. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$6Kdisclosed Aug 5 · filed 2 days after the trade
  6. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$336Kdisclosed Aug 5 · filed 2 days after the trade
  7. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$18.3Kdisclosed Aug 5 · filed 2 days after the trade
  8. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$270Kdisclosed Aug 5 · filed 2 days after the trade
  9. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$429Kdisclosed Aug 5 · filed 2 days after the trade
  10. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$859Kdisclosed Aug 5 · filed 2 days after the trade
  11. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$429Kdisclosed Aug 5 · filed 2 days after the trade
  12. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$867Kdisclosed Aug 5 · filed 2 days after the trade
  13. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$105Kdisclosed Aug 5 · filed 2 days after the trade
  14. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$37.2Kdisclosed Aug 5 · filed 2 days after the trade
  15. ▼ SELLOguzhan Atay Chairman and CEOBLLN BillionToOne, Inc.$11.4Kdisclosed Aug 5 · filed 2 days after the trade

See every trade on BLLN →