Tsao David Insider Trading Activity
Tsao David has been net-selling over the last 12 months with 1 purchase and 10 sales across 1 company.
BLLN is the most-traded position with 11 trades. The largest single transaction was a sale of BLLN for $482K on Jul 13, 2026.
Performance Scorecard
Forward stock performance after each transaction by Tsao David. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | +74.4% | — | 100% | 1 |
| 90 days | +41.9% | — | 100% | 1 |
| 120 days | +20.2% | — | 100% | 1 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersBLLN · BillionToOne, Inc.
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | Δ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
Jul 13, 2026 | BLLN | Sell | 1,028 | $126.90 | $130K | −50.7% | CTO | |
Jul 13, 2026 | BLLN | Sell | 1,102 | $122.90 | $135K | −5.2% | CTO | |
Jul 13, 2026 | BLLN | Sell | 2,477 | $123.84 | $307K | −12.4% | CTO | |
Jul 13, 2026 | BLLN | Sell | 2,415 | $124.90 | $302K | −13.9% | CTO | |
Jul 13, 2026 | BLLN | Sell | 3,185 | $125.85 | $401K | −21.2% | CTO | |
Jul 13, 2026 | BLLN | Sell | 821 | $126.89 | $104K | −6.9% | CTO | |
Jul 13, 2026 | BLLN | Sell | 1,138 | $122.84 | $140K | −10.3% | CTO | |
Jul 13, 2026 | BLLN | Sell | 2,274 | $123.71 | $281K | −23.1% | CTO | |
Jul 13, 2026 | BLLN | Sell | 1,725 | $124.65 | $215K | −22.7% | CTO | |
Jul 13, 2026 | BLLN | Sell | 3,835 | $125.76 | $482K | −65.4% | CTO | |
Nov 7, 2025 Filed 3d late | BLLN | Buy | 1,000 | $60.00 | $60K | — | CTO |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| BLLN | BillionToOne, Inc. | 11 | $2.6M |
Other insiders at BillionToOne, Inc.
2 other tracked filers at BLLN.