Transaction · 0002088549-26-000015

Atay Oguzhan

Atay Oguzhan, CHAIR, reported a transaction classified as exercise at BillionToOne, Inc. involving 5150.000000 shares for an estimated $14420.00. Reported holdings after the transaction were 5150.000000 shares. The stored filing text includes a detected 10b5-1 reference.

exerciseSEC transaction code MCHAIR
BLLNBillionToOne, Inc.
Trade date
Oct 15, 2026
Filing date
Oct 16, 2026
View on SEC Insider profile
Estimated value$14.4kShares × reported price
Shares traded5.15k$2.80 per share
Holdings after5.15kDirect
% of reported position tradedUnavailableThis security and ownership context
How reported position traded is calculated

Calculated only for code-P purchases and code-S sales.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

BLLN price since this filing

Daily closing prices, with the filing date and available return windows
BLLN · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago +6.3%1w ago -2.8%1d ago -0.2%
Returns since7d30d90d180d1y

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
exercise
Code M
Identifier
0002088549-26-000015
Class A Common Stock
Transaction date
Oct 15, 2026
Filed Oct 16, 2026, 11:00 PM · 1d delay
Shares
5,150 sh
$2.80 per share
Estimated value
$14.4k
Computed from shares × price
Holdings after
5,150 sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Direct Ownership Large Holdings Increase 10b5-1 Detected
Filing-only score

0 points

Compact filing score computed from stored Form 4 facts. Version v1.

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

How this score is calculated
  • direct_ownership+6 points

    direct_or_indirect_ownership = D

    Direct ownership reports the insider's personal stake.
  • timely_filing+4 points

    reporting_delay_days = 1

    Filing reported within two business days of the transaction.
  • tenb5_1_detected-10 points

    is_10b5_1 = true

    Stored filing content includes detected 10b5-1 language.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chairman and CEO

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

  2. F2

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $98.000 to $98.990 per share, inclusive. The holder undertakes to pro…

  3. F3

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $98.000 to $98.770 per share, inclusive. The holder undertakes to pro…

  4. F4

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $99.270 to $100.250 per share, inclusive. The holder undertakes to pr…

  5. F5

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $100.270 to $101.200 per share, inclusive. The holder undertakes to p…

  6. F6

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.370 to $102.140 per share, inclusive. The holder undertakes to p…

  7. F7

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.765 to $102.830 per share, inclusive. The holder undertakes to p…

  8. F8

    The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person's spouse on June 7, 2026.

  9. F9

    Represents shares held by the Reporting Person's spouse.

  10. F10

    The options are fully vested and exercisable.

Original filing · 0002088549-26-000015
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