Laura Berner - 08 Oct 2026 Form 3 Insider Report for TRex Bio, Inc.

Reporting relationship
Chief Operating Officer
Issuer ticker
N/A
Reported as of
08 Oct 2026
Net transaction value
$0
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
3
Accepted by SEC
08 Oct 2026, 21:46:04 UTC
Prior SEC filing
11 Jun 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/ Brandon Hants, Attorney-in-Fact

Key filing fact

Laura Berner filed Form 3 for TRex Bio, Inc. on 08 Oct 2026.

Key facts

  • This page summarizes Laura Berner's Form 3 filing for TRex Bio, Inc..
  • 0 reported transactions and 4 derivative rows are listed below.
  • Accepted by SEC: 08 Oct 2026, 21:46.

Change

  • Previous filing in this sequence was filed on 11 Jun 2026.
  • Current net transaction value: $0.

Research use

  • This tells you what this filing adds before you inspect full transaction and derivative tables.
  • You can trace every row back to the original SEC filing document.

Evidence

Official SEC source

Ownership activity is grounded in SEC Form 3 disclosures.

View source filing

Reporting Owners (1)

CIK 0001958382 Primary reporting owner

Berner Laura

Relationship
Chief Operating Officer
Address
C/O TREX BIO, INC., 269 EAST GRAND AVENUE, SUITE 300, SOUTH SAN FRANCISCO
Signature
/s/ Brandon Hants, Attorney-in-Fact
Signature date
08 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

No ticker holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
168,574
Date
08 Oct 2026
Ownership
Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

No ticker holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date
08 Oct 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
1,864
Exercise price
$1.09
Footnotes
F1
No ticker holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date
08 Oct 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
3,373
Exercise price
$1.09
Footnotes
F2
No ticker holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date
08 Oct 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
91,922
Exercise price
$1.24
Footnotes
F3
No ticker holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date
08 Oct 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
77,180
Exercise price
$1.28
Footnotes
F4
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The option had a vesting start date of February 24, 2023. 25% of the option vested on February 24, 2024, the first anniversary of the vesting date, and vests as to the remaining shares in equal monthly installments over 36 months, subject to continued service through the applicable vesting dates.

Footnote F2

The option had a vesting start date of February 27, 2024. 25% of the option vested on February 27, 2025, the first anniversary of the vesting date, and vests as to the remaining shares in equal monthly installments over 36 months, subject to continued service through the applicable vesting dates.

Footnote F3

This option had a vesting start date of April 1, 2025 and vests in equal monthly installments over 48 months, subject to continued service through the applicable vesting dates.

Footnote F4

This option had a vesting start date of February 19, 2026, and vests in equal monthly installments over 48 months, subject to continued service through the applicable vesting dates.

SEC remarks

Exhibit List: Exhibit 24 - Power of Attorney

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