Insider · CIK 0002087127
David Tsao
officerdirector
Files at BLLN (BillionToOne, Inc.). First filing Nov 12, 2025, latest Oct 7, 2026.
Track record
Not enough history
Fewer than three past buys with six months of prices.
Median 6-month excess
-
after past buys, n = 0
Hit rate
-
past buys that beat the index over 6 months
Open-market trades
1 / 3
$60k bought, $4.6M sold
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
BLLN: BillionToOne, Inc.
BLLNOct 9, 2026 · close 98.09
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 40Moderate | BillionToOne, Inc. | $2.2M 20,000 shares | -95% | +70% from low-27% from high | |
| 31Weak | BillionToOne, Inc. | $417k 3,333 shares | -77% | +95% from low-17% from high | |
| 40Moderate | BillionToOne, Inc. | $2.0M 20,000 shares | -95% | - | |
| 55Moderate | BillionToOne, Inc. | $60k 1,000 shares | - | 0% from low-8% from high |
Transactions
Every row this insider has filed, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Oct 5, 2026 | BLLN BillionToOne, Inc. | MOption exercise Class A Common Stock10b5-1 | +10,000 | $2.80 | $28k | 11,000 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | MOption exercise Class A Common Stock10b5-1 | +10,000 | $2.80 | $28k | 21,000 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -866 | $105.90 | $92k | 20,134 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -1,909 | $107.20 | $205k | 18,225 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -4,284 | $108.39 | $464k | 13,941 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -2,921 | $109.00 | $318k | 11,020 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -20 | $110.08 | $2,202 | 11,000 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -555 | $105.56 | $59k | 10,445 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -400 | $106.10 | $42k | 10,045 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -2,200 | $107.47 | $236k | 7,845 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -4,916 | $108.53 | $534k | 2,929 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -1,829 | $109.14 | $200k | 1,100 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -100 | $110.09 | $11k | 1,000 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -10,000 | $2.80 | $28k | 546,667 | 5 d ago |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -10,000 | $2.80 | $28k | 536,667 | 5 d ago |
| Sep 24, 2026 | BLLN BillionToOne, Inc. | MOption exercise Class A Common Stock10b5-1 | +3,333 | $2.80 | $9,332 | 4,333 | 14 d ago |
| Sep 24, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -3,333 | $125.00 | $417k | 1,000 | 14 d ago |
| Sep 24, 2026 | BLLN BillionToOne, Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -3,333 | $2.80 | $9,332 | 556,667 | 14 d ago |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | MOption exercise Class A Common Stock10b5-1 | +10,000 | $2.80 | $28k | 11,000 | 31 d ago |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | MOption exercise Class A Common Stock10b5-1 | +10,000 | $2.80 | $28k | 21,000 | 31 d ago |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -10,000 | $97.54 | $975k | 11,000 | 31 d ago |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -10,000 | $100.00 | $1.0M | 1,000 | 31 d ago |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -10,000 | $2.80 | $28k | 570,000 | 31 d ago |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -10,000 | $2.80 | $28k | 560,000 | 31 d ago |
| Sep 3, 2026 | BLLN BillionToOne, Inc. | CConversion Class A Common Stock | +20,000 | $0.00 | $0 | 21,000 | 34 d ago |
| Sep 8, 2026 | BLLN BillionToOne, Inc. | GGift Class A Common Stock | -20,000 | $0.00 | $0 | 1,000 | 34 d ago |
| Sep 3, 2026 | BLLN BillionToOne, Inc. | CConversion Class B Common Stockderivative | -20,000 | $0.00 | $0 | 2,305,108 | 34 d ago |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Common Stock | -2,325,108 | - | - | 0 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Class A Common Stock | +2,325,108 | - | - | 2,325,108 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Class A Common Stock | -2,325,108 | - | - | 0 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | POpen-market purchase Class A Common Stock | +1,000 | $60.00 | $60k | 1,000 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Class B Common Stockderivative | +2,325,108 | $0.00 | $0 | 2,325,108 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Stock Option (right to buy)derivative | -640,000 | - | - | 0 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Stock Option (right to buy)derivative | +640,000 | - | - | 640,000 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Stock Option (right to buy)derivative | -501,551 | - | - | 0 | Nov 12, 2025 |
| Nov 7, 2025 | BLLN BillionToOne, Inc. | JOther Stock Option (right to buy)derivative | +501,551 | - | - | 501,551 | Nov 12, 2025 |
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.