David Tsao sold $2.2M of BLLN
Chief Technology Officer at BillionToOne, Inc.. 20,000 shares at an average of $108.15, traded Oct 5, 2026, filed Oct 7, 2026.
Score components
This filing reached EDGAR on Oct 7, 2026, so its score and components open to free visitors on Oct 14, 2026. The trade itself, the rows in the filing and the price context are public now.
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0002087127-26-000015, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Oct 5, 2026 | MOption exercise Class A Common Stock10b5-1 | +10,000 | $2.80 | $28k | 11,000 | 7 d ago |
| Oct 5, 2026 | MOption exercise Class A Common Stock10b5-1 | +10,000 | $2.80 | $28k | 21,000 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -866 | $105.90 | $92k | 20,134 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -1,909 | $107.20 | $205k | 18,225 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -4,284 | $108.39 | $464k | 13,941 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -2,921 | $109.00 | $318k | 11,020 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -20 | $110.08 | $2,202 | 11,000 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -555 | $105.56 | $59k | 10,445 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -400 | $106.10 | $42k | 10,045 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -2,200 | $107.47 | $236k | 7,845 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -4,916 | $108.53 | $534k | 2,929 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -1,829 | $109.14 | $200k | 1,100 | 7 d ago |
| Oct 5, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $110.09 | $11k | 1,000 | 7 d ago |
| Oct 5, 2026 | MOption exercise Stock Option (right to buy)derivative10b5-1 | -10,000 | $2.80 | $28k | 546,667 | 7 d ago |
| Oct 5, 2026 | MOption exercise Stock Option (right to buy)derivative10b5-1 | -10,000 | $2.80 | $28k | 536,667 | 7 d ago |
Related signals
Other insiders at BillionToOne, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| Pro nowfree Oct 14, 2026 | BillionToOne, Inc. | John Roderick ten Bosch SVP of Laboratory Operations | $298k 2,834 shares | -13% | |
| 50Moderate | BillionToOne, Inc. | Oguzhan Atay Chairman and CEO | $1.3M 10,999 shares | -132% | |
| 21Weak | BillionToOne, Inc. | John Roderick ten Bosch SVP of Laboratory Operations | $170k 1,416 shares | -6% | |
| 31Weak | BillionToOne, Inc. | David Tsao Chief Technology Officer | $417k 3,333 shares | -77% | |
| 21Weak | BillionToOne, Inc. | John Roderick ten Bosch SVP of Laboratory Operations | $151k 1,416 shares | -6% | |
| 40Moderate | BillionToOne, Inc. | Thomas P. Lynch See Remarks | $3.9M 35,112 shares | -98% | |
| 50Moderate | BillionToOne, Inc. | Oguzhan Atay Chairman and CEO | $3.0M 30,331 shares | -121% | |
| 21Weak | BillionToOne, Inc. | John Roderick ten Bosch SVP of Laboratory Operations | $138k 1,416 shares | -5% | |
| 40Moderate | BillionToOne, Inc. | David Tsao Chief Technology Officer | $2.0M 20,000 shares | -95% | |
| 40Moderate | BillionToOne, Inc. | Thomas P. Lynch See Remarks | $2.0M 20,000 shares | -97% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.