Transaction · 0002088549-26-000012

Atay Oguzhan

Atay Oguzhan, CHAIR, reported an open-market or private sale at BillionToOne, Inc. involving 2666.000000 shares for an estimated $321626.24. Reported holdings after the transaction were 154502.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SCHAIR
BLLNBillionToOne, Inc.
Filing timeOct 01
Trade dateSep 28, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded1.7%Shares sold ÷ (holdings after + shares sold). Estimated position before: 157,168 shares.

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.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$106.44
Pre-filing
1mo ago -12.4%1w ago -2.4%1d ago +15.6%
Returns since
7d30d90d180d1y

BLLN price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
BLLN since 2026-10-01Filed today · pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0002088549-26-000012
Class A Common Stock
Transaction date
Sep 28, 2026
Filed Oct 01, 2026, 12:33 AM · 3d delay
Shares
2.66k sh
$120.64 per share
Estimated value
-$321k
Computed from shares × price
Holdings after
154k sh
Indirect · By spouse

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Cluster Selling Repeat Seller 10b5-1 Detected
-10score
Filing-only score

-10

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

Mixed or weak signal

This filing has a negative filing-only score. It may be less informative as an insider-activity signal and needs extra context.

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 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.

  3. F3

    Represents shares held by the Reporting Person's spouse.

  4. F4

    The options are fully vested and exercisable.

Original filing · 0002088549-26-000012
Related transactions

0 other filings

Same reporting owner
Recent company activity

0 recent txs

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