Sakakibara Shan Riku — SEC Form 4 filings
SEC reporting owner CIK 2088547. 6 Form 4 filings on record with FilingPulse; latest filed 2026-09-14.
Transaction summary — filings shown
Covers all 6 filings on record, filed 2025-11-12 to 2026-09-14. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 10 legs across 4 filings — 28,000 shares, $3,226,640 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 19.
- Largest priced transaction: sale of 4,000 shares @ $140.21 ($560,840) in BillionToOne, Inc., filed 2026-08-04.
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 Product Officer | 6 | — | 10 legs · 28,000 sh · $3,226,640 | 19 |
Form 4 filings — Sakakibara Shan Riku
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-14 | 4 | BillionToOne, Inc. (BLLN) | Gift (G): 3,500 @ $0 | EDGAR |
| 2026-08-04 | 4 | BillionToOne, Inc. (BLLN) | Sale (S): 4,000 @ $140.21 | EDGAR |
| 2026-07-13 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 174 @ $8.65 · Option exercise (M): 1,117 @ $30.78 · Option exercise (M): 1,355 @ $30.78 · Option exercise (M): 1,354 @ $30.78 · Sale (S): 4,000 @ $125 · Sale (S): 174 @ $125 · +7 more | EDGAR |
| 2026-06-26 | 4 | BillionToOne, Inc. (BLLN) | Option exercise (M): 4,000 @ $8.65 · Sale (S): 4,000 @ $110 · Sale (S): 4,000 @ $110 · Option exercise (M): 4,000 (derivative) @ $8.65 | EDGAR |
| 2026-06-10 | 4 | BillionToOne, Inc. (BLLN) | Sale (S): 4,000 @ $96.45 · Sale (S): 4,000 @ $100 | EDGAR |
| 2025-11-12 | 4 | BillionToOne, Inc. (BLLN) | Other (J): 220,000 · Other (J): 220,000 · Other (J): 50,000 (derivative) · Other (J): 50,000 (derivative) · Other (J): 40,000 (derivative) · Other (J): 40,000 (derivative) · +2 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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