Marcella K. Ruddy - 04 Mar 2026 Form 4 Insider Report for Tectonic Therapeutic, Inc. (TECX)

Reporting relationship: Chief Medical Officer
Issuer ticker: TECX
Reported as of: 04 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Mar 2026, 17:42:06 UTC
Prior SEC filing: 10 Feb 2026
Next SEC filing: 09 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Daniel Lochner, Attorney-in-Fact

Key filing fact

Marcella K. Ruddy filed Form 4 for Tectonic Therapeutic, Inc. (TECX) on 05 Mar 2026.

Key facts

This page summarizes Marcella K. Ruddy's Form 4 filing for Tectonic Therapeutic, Inc. (TECX).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Mar 2026, 17:42.

Change

Previous filing in this sequence was filed on 10 Feb 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

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002023849 Primary reporting owner

Ruddy Marcella K.

Relationship: Chief Medical Officer
Address: C/O TECTONIC THERAPEUTIC, INC., 490 ARSENAL WAY, SUITE 200, WATERTOWN
Signature: /s/ Daniel Lochner, Attorney-in-Fact
Signature date: 05 Mar 2026

Reported non-derivative transactions

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

TECX transaction

Common Stock

Award

Transaction value
Shares: +26,500
Change %: +50%
Price: $0.000000^*
Shares after: 79,747
Date: 04 Mar 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

TECX transaction Derivative

Employee Stock Option (Right to Buy)

Award

Transaction value
Shares: +24,250
Change %
Price: $0.000000^*
Shares after: 24,250
Date: 04 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 24,250
Exercise price: $27.41
Footnotes: F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

These shares are represented by restricted stock units. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. The shares shall vest in 3 equal annual installments on each of March 4, 2027, March 4, 2028 and March 4, 2029, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

Footnote F2

The shares subject to the option vest in 48 equal monthly installments beginning on April 4, 2026, subject to the Reporting Person's continued service to the Issuer on each such vesting date.