Transaction · 0002087127-26-000015

Tsao David

Tsao David, CTO, reported an open-market or private sale at BillionToOne, Inc. involving 4284.000000 shares for an estimated $464355.61. Reported holdings after the transaction were 13941.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SCTO
BLLNBillionToOne, Inc.
Filing timeOct 07
Trade dateOct 05, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded23.51%Shares sold ÷ (holdings after + shares sold). Estimated position before: 18,225 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
$95.75
Pre-filing
1mo ago +3.8%1w ago +27.1%1d ago +10.6%
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 2026-10-07Filed yesterday · 1 day of post-filing data
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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
0002087127-26-000015
Class A Common Stock
Transaction date
Oct 05, 2026
Filed Oct 07, 2026, 11:56 PM · 2d delay
Shares
4.28k sh
$108.39 per share
Estimated value
-$464k
Computed from shares × price
Holdings after
13.9k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Cluster Selling Direct Ownership Large Holdings Reduction Repeat Seller 10b5-1 Detected
0score
Filing-only score

0

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.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chief Technology Officer

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 $105.505 to $106.350 per share, inclusive. The holder undertakes to p…

  3. F3

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.730 to $107.700 per share, inclusive. The holder undertakes to p…

  4. F4

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.7354 to $108.710 per share, inclusive. The holder undertakes to…

  5. F5

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $108.740 to $109.480 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 $104.880 to $105.720 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 $105.890 to $106.180 per share, inclusive. The holder undertakes to p…

  8. F8

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.010 to $107.970 per share, inclusive. The holder undertakes to p…

  9. F9

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $108.040 to $109.030 per share, inclusive. The holder undertakes to p…

  10. F10

    The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $109.040 to $109.500 per share, inclusive. The holder undertakes to p…

  11. F11

    The options are fully vested and exercisable.

Original filing · 0002087127-26-000015
Related transactions

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Same reporting owner
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