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David Tsao, Chief Technology Officer at BillionToOne, sold BLLN on Oct 5, 2026

Data as of Oct 16

▼ SELL$318K2,921 shares at $109.00David Tsao Chief Technology OfficerBLLN BillionToOne, Inc.
Watch BLLN
Traded
Oct 5, 2026
Disclosed
Oct 7, 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

David Tsao, Chief Technology Officer at BillionToOne, sold BLLN on Oct 5, 2026TRADEDDISCLOSED
BLLNSimilar stocks (XLV — its sector index fund), rebased to BLLN's price on the disclosure day
BLLN since disclosure
+2.5%
after the sale
Similar stocks (XLV) since disclosure
+4.7%
XLV — its sector index fund

Change in closing price from Oct 7, 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. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$2.2Kdisclosed Oct 7 · filed 2 days after the trade
  2. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$534Kdisclosed Oct 7 · filed 2 days after the trade
  3. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$464Kdisclosed Oct 7 · filed 2 days after the trade
  4. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$91.7Kdisclosed Oct 7 · filed 2 days after the trade
  5. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$205Kdisclosed Oct 7 · filed 2 days after the trade
  6. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$236Kdisclosed Oct 7 · filed 2 days after the trade
  7. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$11Kdisclosed Oct 7 · filed 2 days after the trade
  8. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$200Kdisclosed Oct 7 · filed 2 days after the trade
  9. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$42.4Kdisclosed Oct 7 · filed 2 days after the trade
  10. ▼ SELLDavid Tsao Chief Technology OfficerBLLN BillionToOne, Inc.$58.6Kdisclosed Oct 7 · filed 2 days after the trade

See every trade on BLLN →