Alexandria Venture Investments, LLC - 13 Oct 2026 Form 4 Insider Report for TRex Bio, Inc.

Reporting relationship: 10%+ Owner
Issuer ticker: N/A
Reported as of: 13 Oct 2026
Net transaction value: +$2,499,994
SEC form: 4
Accepted by SEC: 15 Oct 2026, 16:33:52 UTC
Prior SEC filing: 08 Oct 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Marc E. Binda, Chief Financial Officer and Treasurer By: ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation, managing member

Key filing fact

Alexandria Venture Investments, LLC filed Form 4 for TRex Bio, Inc. on 15 Oct 2026.

Key facts

This page summarizes Alexandria Venture Investments, LLC's Form 4 filing for TRex Bio, Inc..
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 15 Oct 2026, 16:33.

Change

Previous filing in this sequence was filed on 08 Oct 2026.
Current net transaction value: +$2,499,994.

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

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001722024 Primary reporting owner

Alexandria Venture Investments, LLC

Relationship: 10%+ Owner
Address: 26 NORTH EUCLID AVENUE, PASADENA
Signature: By: /s/ Marc E. Binda, Chief Financial Officer and Treasurer By: ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation, managing member
Signature date: 15 Oct 2026

Reported non-derivative transactions

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

No ticker transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +1,167,930
Change %
Price
Shares after: 1,167,930
Date: 13 Oct 2026
Ownership: Direct
Footnotes: F1

No ticker transaction

Common Stock

Purchase

Transaction value: $2,499,994
Shares: +178,571
Change %: +15%
Price: $14.00
Shares after: 1,346,501
Date: 13 Oct 2026
Ownership: Direct

Reported derivative securities

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

No ticker transaction Derivative

Series A-3 Preferred Stock

Conversion of derivative security

Transaction value
Shares: -1,033,541
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 13 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 267,418
Exercise price
Footnotes: F1

No ticker transaction Derivative

Series B Preferred Stock

Conversion of derivative security

Transaction value
Shares: -3,480,387
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 13 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 900,512
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Alexandria Venture Investments, LLC is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 1 footnote

Footnote F1

Each share of preferred stock automatically converted into the Issuer's common stock at a ratio of 3.8649 shares of preferred stock to 1 share of common stock upon closing of the Issuer's initial public offering on October 13, 2026, for no additional consideration. The shares had no expiration date.