Reporting owner · CIK 0002088549
Atay Oguzhan
SEC Form 4 history across 1 companies, 41 transactions and 5 filings.
CHAIRChairman and CEOBillionToOne, Inc.
Open-market transaction mix0% buys0 buys · 26 sales
Available history · Sep 08, 2026 – Oct 15, 2026
Latest insider transactions
Form 4 filings from available history.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | -$23.3kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$321kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$1.00MView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | M · exercise10b5-1 detectedSEC filing ↗ | $23.3kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | -$23.3kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | -$46.6kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$261kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$261kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$318kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$202kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$149kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$165kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$731kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$254kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$244kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | S · sale10b5-1 detectedSEC filing ↗ | -$440kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | M · exercise10b5-1 detectedSEC filing ↗ | $23.3kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | M · exercise10b5-1 detectedSEC filing ↗ | $46.6kView disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | C · unknownDerivative securitySEC filing ↗ | $0View disclosure → | |
BLLNBillionToOne, Inc. | Atay OguzhanCHAIR | G · giftSEC filing ↗ | $0View disclosure → |
Latest Form 4 facts
Quick context from source filings
Latest open-market transaction
sale at BillionToOne, Inc. on Oct 15, 2026 valued at $13,669.
Review SEC filingLatest buy
No open-market insider purchase is available.
Monthly open-market activity
Last 2 reported months · purchases and sales
View exact monthly values
| Month | Purchases | Sales | Buy value | Sale value | Net value |
|---|---|---|---|---|---|
| Sep 2026 | 0 | 12 | $0.00 | $4,357,363.73 | -$4,357,363.73 |
| Oct 2026 | 0 | 14 | $0.00 | $2,914,024.51 | -$2,914,024.51 |
Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.
Ownership and transaction size
Ownership and ticket size
Average P/S size$279.7K
Median P/S size$249.6K
Direct36
Indirect5
Oct 15, 2026exercise
Filing-only signals
Deterministic matches in this insider's history
Associated companies
Companies in the disclosed reporting history
Open-market buy performance
90-day forward return on this insider's open-market purchases
No open-market purchases in available history
A 90-day purchase return requires an open-market buy. No eligible purchases are recorded in this history.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
29 observations · Sep 8, 2026 – Oct 15, 2026. Window ends at the latest available report, not today.
Selected observation · Oct 15, 20260 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| Sep 8, 2026 | 20,000 | Sep 10, 2026 | View transaction |
| Sep 9, 2026 | 0 | Sep 10, 2026 | View transaction |
| Sep 14, 2026 | 16,666 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 24,999 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 20,534 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 18,078 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 15,547 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 8,333 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 6,653 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 5,153 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 3,143 | Sep 16, 2026 | View transaction |
| Sep 14, 2026 | 0 | Sep 16, 2026 | View transaction |
| Sep 28, 2026 | 8,333 | Oct 1, 2026 | View transaction |
| Sep 28, 2026 | 0 | Oct 1, 2026 | View transaction |
| Oct 12, 2026 | 16,667 | Oct 14, 2026 | View transaction |
| Oct 12, 2026 | 14,706 | Oct 14, 2026 | View transaction |
| Oct 12, 2026 | 12,153 | Oct 14, 2026 | View transaction |
| Oct 12, 2026 | 5,390 | Oct 14, 2026 | View transaction |
| Oct 12, 2026 | 1,521 | Oct 14, 2026 | View transaction |
| Oct 12, 2026 | 0 | Oct 14, 2026 | View transaction |
| Oct 14, 2026 | 3,183 | Oct 16, 2026 | View transaction |
| Oct 14, 2026 | 100 | Oct 16, 2026 | View transaction |
| Oct 14, 2026 | 0 | Oct 16, 2026 | View transaction |
| Oct 15, 2026 | 5,150 | Oct 16, 2026 | View transaction |
| Oct 15, 2026 | 4,250 | Oct 16, 2026 | View transaction |
| Oct 15, 2026 | 2,389 | Oct 16, 2026 | View transaction |
| Oct 15, 2026 | 1,113 | Oct 16, 2026 | View transaction |
| Oct 15, 2026 | 133 | Oct 16, 2026 | View transaction |
| Oct 15, 2026 | 0 | Oct 16, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
Atay Oguzhan Insider Activity FAQ
SEC Form 4 context
Who is Atay Oguzhan?
Atay Oguzhan is a reporting owner in SEC Form 4 filings with reporting owner CIK 0002088549.
Which companies has Atay Oguzhan reported transactions for?
BillionToOne, Inc.
When was Atay Oguzhan's latest insider buy?
No open-market insider purchase is available for this period.
When was Atay Oguzhan's latest insider sale?
sale at BillionToOne, Inc. on Oct 15, 2026 valued at $13,669.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.