Oguzhan Atay - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Oguzhan Atay has filed 3 SEC Form 4 filings across 1 company in the last 90 days - selling. Lifetime open-market sales: $10.10M.
Profile
Oguzhan Atay is Chairman and CEO at BillionToOne, Inc. (BLLN). Atay has reported 6 insider filings with the SEC since 2025. The most recent filing was in July 2026.
| Role | Chairman and CEO, Director |
|---|---|
| Notability | 40/100 |
Board memberships
- BillionToOne, Inc.
Reported roles
- Chairman and CEO
Trading Pattern
InsiderAlpha's records for Oguzhan Atay go back to 2025: 4 primary Form 4 filings, an average of 2.0 per year. 55 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 Oguzhan Atay 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.
- Chairman and CEO, Director at BillionToOne, Inc. (BLLN) - 2 filings, 2026
- Director at BillionToOne, Inc. (BLLN) - 1 filing, 2026
- Insider at BillionToOne, Inc. (BLLN) - 1 filing, 2025
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 352 | $128.23 | $45K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 2.7K | $127.44 | $339K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 2.0K | $126.48 | $253K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 7.5K | $125.43 | $939K |
| 2026-07-13 | BLLN | BillionToOne, Inc. | M - Option exercise [10b5-1] | 12.5K | $2.80 | $35K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 50 | $124.74 | $6K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.2K | $124.04 | $151K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 2.3K | $123.25 | $286K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 586 | $122.08 | $72K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 444 | $120.69 | $54K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 591 | $119.67 | $71K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.0K | $118.81 | $123K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 50 | $124.74 | $6K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.2K | $124.04 | $151K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 2.3K | $123.25 | $286K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 587 | $122.08 | $72K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 444 | $120.69 | $54K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 591 | $119.67 | $71K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 1.0K | $118.81 | $123K |
| 2026-07-08 | BLLN | BillionToOne, Inc. | S - Open-market sale [10b5-1] | 194 | $124.61 | $24K |
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 Oguzhan Atay 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.
- 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
- Shan Riku Sakakibara - $2.67M 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:
- Eric L. Oliver
- Opaleye Management Inc.
- ORBIMED ADVISORS LLC
- Stephen G. Pagliuca
- Pale Fire Capital SE
- Bhaskar Panigrahi
- Paresh Patel
- PAULSON CO. INC.
Frequently Asked Questions
Who is Oguzhan Atay?
Oguzhan Atay is Chairman and CEO at BillionToOne, Inc. (BLLN). Atay 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 Oguzhan Atay submitted recently?
3 primary Form 4 filings in the last 90 days, covering 1 company.
Has Oguzhan Atay been buying or selling stock?
Recorded transactions: 0 open-market purchases and 42 open-market sales ($10.10M) across all tracked filings.
Where can I see all of Oguzhan Atay'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 Oguzhan Atay profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.