Tsao David — SEC Form 4 filings
SEC reporting owner CIK 2087127. 7 Form 4 filings on record with FilingPulse; latest filed 2026-09-11.
Transaction summary — filings shown
Covers all 7 filings on record, filed 2025-11-12 to 2026-09-11. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 1 leg across 1 filing — 1,000 shares, $60,000 total (shares × price as filed).
- Open-market sales (code S, non-derivative): 25 legs across 5 filings — 80,000 shares, $8,447,023 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 27.
- Largest priced transaction: sale of 10,000 shares @ $100.00 ($1,000,000) in BillionToOne, Inc., filed 2026-09-11.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| BillionToOne, Inc. (BLLN) | Chief Technology Officer, Director | 7 | 1 leg · 1,000 sh · $60,000 | 25 legs · 80,000 sh · $8,447,023 | 27 |
Form 4 filings — Tsao David
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-11 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 10,000 @ $2.80 · Option exercise (M): 10,000 @ $2.80 · Sale (S): 10,000 @ $97.54 · Sale (S): 10,000 @ $100 · Option exercise (M): 10,000 (derivative) @ $2.80 · Option exercise (M): 10,000 (derivative) @ $2.80 | EDGAR |
| 2026-09-08 | 4 | BillionToOne, Inc. (BLLN) | Conversion (C): 20,000 @ $0 · Gift (G): 20,000 @ $0 · Conversion (C): 20,000 (derivative) @ $0 | EDGAR |
| 2026-08-27 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 10,000 @ $2.80 · Sale (S): 10,000 @ $100 · Option exercise (M): 10,000 (derivative) @ $2.80 | EDGAR |
| 2026-08-12 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 10,000 @ $2.80 · Sale (S): 10,000 @ $92.86 · Option exercise (M): 10,000 (derivative) @ $2.80 | EDGAR |
| 2026-07-15 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 10,000 @ $2.80 · Option exercise (M): 10,000 @ $2.80 · Sale (S): 1,102 @ $122.90 · Sale (S): 2,477 @ $123.84 · Sale (S): 2,415 @ $124.90 · Sale (S): 3,185 @ $125.85 · +8 more | EDGAR |
| 2026-06-17 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 10,000 @ $2.80 · Option exercise (M): 10,000 @ $2.80 · Sale (S): 1,704 @ $100.37 · Sale (S): 2,361 @ $101.55 · Sale (S): 2,816 @ $102.77 · Sale (S): 2,889 @ $103.68 · +9 more | EDGAR |
| 2025-11-12 | 4 | BillionToOne, Inc. (BLLN) | Other (J): 2,325,108 · Other (J): 2,325,108 · Other (J): 2,325,108 · Purchase (P): 1,000 @ $60 · Other (J): 2,325,108 (derivative) @ $0 · Other (J): 640,000 (derivative) · +3 more | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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