Tsao David
- SEC CIK
- 0002087127
In the past year, 1 open-market purchase filing worth $60.0K and 5 sale filings worth $8.45M.
Current role at each company
- BLLN BillionToOne, Inc.Chief Technology Officeras of Sep 11, 2026
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- $60.0K
- 1 filing
- Sold
- $8.45M
- 5 filings
- Net
- −$8.39M
- Bought minus sold
- Companies
- 1
- With open-market trades
Trades
Every Form 4 that lists Tsao David as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 11, 2026 (view filing)6:01 PM ET | Sep 9 | 2 days | Tsao DavidChief Technology Officer | SSaleClass A Common Stock | −20.0K | $98.77 | −$1.98M | −95.2%1.00K after | 2 lots10b5-1 |
| Aug 27, 2026 (view filing)8:19 PM ET | Aug 25 | 2 days | Tsao DavidChief Technology Officer | SSaleClass A Common Stock | −10.0K | $100.00 | −$1.00M | −90.9%1.00K after | 10b5-1 |
| Aug 12, 2026 (view filing)6:51 PM ET | Aug 10 | 2 days | Tsao DavidChief Technology Officer | SSaleClass A Common Stock | −10.0K | $92.86 | −$928.6K | −90.9%1.00K after | 10b5-1 |
| Jul 15, 2026 (view filing)4:38 PM ET | Jul 13 | 2 days | Tsao DavidChief Technology Officer | SSaleClass A Common Stock | −20.0K | $124.88 | −$2.50M | −95.2%1.00K after | 10 lots10b5-1 |
| Jun 17, 2026 (view filing) | Jun 15 | 2 days | Tsao DavidChief Technology Officer | SSaleClass A Common Stock | −20.0K | $102.26 | −$2.05M | −95.2%1.00K after | 11 lots10b5-1 |
| Nov 12, 2025 (view filing) | Nov 7 | 5 days | Tsao DavidChief Technology Officer | PPurchaseClass A Common Stock | +1.00K | $60.00 | +$60.0K | New position1.00K after |