David Tsao
CIK: 0002087127
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
BillionToOne, Inc.
Discretionary Trading P&L
Holdings
Transaction History (54 total)
- Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct1.8K shares at avg. $109.14$200K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct4.9K shares at avg. $108.53$534K - Oct 5, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct10K shares at avg. $2.80$28K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct2.9K shares at avg. $109.00$318K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct100 shares at avg. $110.09$11K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct866 shares at avg. $105.90$92K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct1.9K shares at avg. $107.19$205K - Oct 5, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct10K shares at avg. $2.80$28K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct20 shares at avg. $110.08$2K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct555 shares at avg. $105.56$59K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct4.3K shares at avg. $108.39$464K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct400 shares at avg. $106.10$42K - Oct 5, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct2.2K shares at avg. $107.47$236K - Sep 24, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct3.3K shares at avg. $2.80$9K - Sep 24, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct3.3K shares at avg. $125.00$417K - Sep 9, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct10K shares at avg. $97.54$975K - Sep 9, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct10K shares at avg. $100.00$1.0M - Sep 9, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct10K shares at avg. $2.80$28K - Sep 9, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct10K shares at avg. $2.80$28K - Sep 8, 2026BLLN
BillionToOne, Inc.
Gift(G)Direct20K shares- - Sep 3, 2026BLLN
BillionToOne, Inc.
Conversion(C)Direct20K shares- - Aug 25, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct10K shares at avg. $100.00$1.0M - Aug 25, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct10K shares at avg. $2.80$28K - Aug 10, 2026BLLN
BillionToOne, Inc.
Exercise(M)Direct10K shares at avg. $2.80$28K - Aug 10, 2026BLLN
BillionToOne, Inc.
Sale(S)Direct10K shares at avg. $92.86$929K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 1,829 | $109.14 | $199,625 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 4,916 | $108.53 | $533,554 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 10,000 | $2.80 | $28,000 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 2,921 | $109.00 | $318,398 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 100 | $110.09 | $11,009 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 866 | $105.90 | $91,710 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 1,909 | $107.19 | $204,635 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 10,000 | $2.80 | $28,000 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 20 | $110.08 | $2,202 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 555 | $105.56 | $58,585 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 4,284 | $108.39 | $464,356 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 400 | $106.10 | $42,442 | Direct |
| Oct 5, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 2,200 | $107.47 | $236,435 | Direct |
| Sep 24, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 3,333 | $2.80 | $9,332 | Direct |
| Sep 24, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 3,333 | $125.00 | $416,625 | Direct |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 10,000 | $97.54 | $975,400 | Direct |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 10,000 | $100.00 | $1,000,000 | Direct |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 10,000 | $2.80 | $28,000 | Direct |
| Sep 9, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 10,000 | $2.80 | $28,000 | Direct |
| Sep 8, 2026 | BLLN BillionToOne, Inc. | Gift(G) | 20,000 | - | $0 | Direct |
| Sep 3, 2026 | BLLN BillionToOne, Inc. | Conversion(C) | 20,000 | - | $0 | Direct |
| Aug 25, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 10,000 | $100.00 | $1,000,000 | Direct |
| Aug 25, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 10,000 | $2.80 | $28,000 | Direct |
| Aug 10, 2026 | BLLN BillionToOne, Inc. | Exercise(M) | 10,000 | $2.80 | $28,000 | Direct |
| Aug 10, 2026 | BLLN BillionToOne, Inc. | Sale(S) | 10,000 | $92.86 | $928,600 | Direct |
1-25 of 54 transactions
About Tsao David
Tsao David (SEC CIK 0002087127) files insider reports with the SEC as Chief Technology Officer of BillionToOne, Inc. (BLLN).
Signal8 holds 10 ownership filings by Tsao David (1 Form 3, 9 Form 4), filed between Nov 5, 2025 and Oct 7, 2026. Those filings report 54 transactions, from Nov 7, 2025 to Oct 5, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Tsao David's filings is in MENLO PARK, CA.
Recent filings by Tsao David
- Oct 5, 2026: Open-market sales of BLLN shares (2 lines, Form 4, code S).
- Oct 5, 2026: Option exercise of BLLN shares (Form 4, code M).
- Oct 5, 2026: Open-market sales of BLLN shares (4 lines, Form 4, code S).
- Oct 5, 2026: Option exercise of BLLN shares (Form 4, code M).
- Oct 5, 2026: Open-market sales of BLLN shares (5 lines, Form 4, code S).
Other insiders filing for BillionToOne, Inc. (BLLN)
- Atay Oguzhan, Chairman and CEO
- Nomads Partnership, 10% Owner
- Lynch Thomas P.
- ten Bosch John Roderick, SVP of Laboratory Operations
- Sakakibara Shan Riku, Chief Product Officer
- KOLLURI KRISHNA KITTU, Director