Tsao David Insider Trading -- Recent SEC Form 4 Transactions
Tsao David (CIK 2087127) reported 54 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-10-07). Recent activity: Buy BLLN (10,000 shares), Sell BLLN (555 shares), Sell BLLN (866 shares), Sell BLLN (1,909 shares), Sell BLLN (4,284 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 10,000 | $28,000 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 555 | $58,585 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 866 | $91,710 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 1,909 | $204,635 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 4,284 | $464,356 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 2,921 | $318,398 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 20 | $2,202 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 10,000 | $28,000 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 400 | $42,442 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 2,200 | $236,435 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 4,916 | $533,554 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 1,829 | $199,625 |
| 2026-10-07 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 100 | $11,009 |
| 2026-09-28 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 3,333 | $9,332 |
| 2026-09-28 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 3,333 | $416,625 |
| 2026-09-11 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 10,000 | $28,000 |
| 2026-09-11 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 10,000 | $28,000 |
| 2026-09-11 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 10,000 | $975,400 |
| 2026-09-11 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 10,000 | $1.0M |
| 2026-09-08 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 20,000 | $0 |
| 2026-09-08 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 20,000 | $0 |
| 2026-08-27 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 10,000 | $28,000 |
| 2026-08-27 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 10,000 | $1.0M |
| 2026-08-12 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Sell | 10,000 | $928,600 |
| 2026-08-12 | BillionToOne, Inc. (BLLN) | Chief Technology Officer | Buy | 10,000 | $28,000 |
Source: SEC Form 4 filings · as of 2026-10-07