Shan Riku Sakakibara - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Shan Riku Sakakibara has filed 3 SEC Form 4 filings across 1 company in the last 90 days - selling. Lifetime open-market sales: $2.67M.
Profile
Shan Riku Sakakibara holds the role of Chief Product Officer at BillionToOne, Inc. (BLLN). Sakakibara has reported 6 insider filings with the SEC since 2025. The most recent filing was in July 2026.
| Role | Chief Product Officer |
|---|---|
| Notability | 34/100 |
Board memberships
- BillionToOne, Inc.
Reported roles
- Chief Product Officer
Trading Pattern
InsiderAlpha's records for Shan Riku Sakakibara go back to 2025: 4 primary Form 4 filings, an average of 2.0 per year. 19 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Shan Riku Sakakibara has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Chief Product Officer at BillionToOne, Inc. (BLLN) - 4 filings, 2025 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.4K | $125.00 | $169K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.4K | $125.00 | $169K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.1K | $125.00 | $140K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 174 | $125.00 | $22K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 4.0K | $125.00 | $500K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | M - Option exercise [10b5-1] | 1.4K | $30.78 | $42K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | M - Option exercise [10b5-1] | 1.4K | $30.78 | $42K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | M - Option exercise [10b5-1] | 1.1K | $30.78 | $34K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | M - Option exercise [10b5-1] | 174 | $8.65 | $2K |
| 2026-06-26 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 4.0K | $110.00 | $440K |
| 2026-06-26 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 4.0K | $110.00 | $440K |
| 2026-06-26 | BLLN | BillionToOne, Inc. | M - Option exercise [10b5-1] | 4.0K | $8.65 | $35K |
| 2026-06-11 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 4.0K | $100.00 | $400K |
| 2026-06-11 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 4.0K | $96.45 | $386K |
| 2025-11-12 | BLLN | BillionToOne, Inc. | J - Other acquisition / disposition | 220.0K | - | |
| 2025-11-12 | BLLN | BillionToOne, Inc. | J - Other acquisition / disposition | 220.0K | - |
Companies - Last 90 Days
- BillionToOne, Inc. (BLLN) - 3 filings, last 2026-07-13
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Shan Riku Sakakibara has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Oguzhan Atay - $10.10M of BLLN open-market activity in the last 12 months
- David Tsao - $4.60M of BLLN open-market activity in the last 12 months
- Nancy Joann Johnson - $3.74M of BLLN open-market activity in the last 12 months
- Thomas S. Bremner - $2.50M of BLLN open-market activity in the last 12 months
- Bosch John Roderick Ten - $1.04M of BLLN open-market activity in the last 12 months
- Akshay Rai - $150K of BLLN open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Thomas J. Shaw
- Silver Point Capital L.P.
- SilverBay Capital Management LLC
- Michael Simanovsky
- Bob R. Simpson
- Ranbir Singh
- Ross Jeffery Sklar
- Barry Sloane
Frequently Asked Questions
Who is Shan Riku Sakakibara?
Shan Riku Sakakibara holds the role of Chief Product Officer at BillionToOne, Inc. (BLLN). Sakakibara has reported 6 insider filings with the SEC since 2025. The most recent filing was in July 2026.…
How many SEC Form 4 filings has Shan Riku Sakakibara submitted recently?
3 primary Form 4 filings in the last 90 days, covering 1 company.
Has Shan Riku Sakakibara been buying or selling stock?
Recorded transactions: 0 open-market purchases and 9 open-market sales ($2.67M) across all tracked filings.
Where can I see all of Shan Riku Sakakibara's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Shan Riku Sakakibara profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.