Peter McNamara - 25 Sep 2026 Form 4 Insider Report for Tectonic Therapeutic, Inc. (TECX)

Reporting relationship: Chief Scientific Officer
Issuer ticker: TECX
Reported as of: 25 Sep 2026
Net transaction value: -$12,349
SEC form: 4
Accepted by SEC: 02 Oct 2026, 17:00:43 UTC
Prior SEC filing: 08 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Daniel Lochner, Attorney-in-Fact

Key filing fact

Peter McNamara filed Form 4 for Tectonic Therapeutic, Inc. (TECX) on 02 Oct 2026.

Key facts

This page summarizes Peter McNamara's Form 4 filing for Tectonic Therapeutic, Inc. (TECX).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 02 Oct 2026, 17:00.

Change

Previous filing in this sequence was filed on 08 Sep 2026.
Current net transaction value: -$12,349.

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 0002023255 Primary reporting owner

McNamara Peter

Relationship: Chief Scientific Officer
Address: C/O TECTONIC THERAPEUTIC, INC., 490 ARSENAL WAY, SUITE 200, WATERTOWN
Signature: /s/ Daniel Lochner, Attorney-in-Fact
Signature date: 02 Oct 2026

Reported non-derivative transactions

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

TECX transaction

Common Stock

Tax liability

Transaction value
Shares: -444
Change %: -0.8%
Price: $23.67^*
Shares after: 54,841
Date: 25 Sep 2026
Ownership: Direct
Footnotes: F1

TECX transaction

Common Stock

Sale

Transaction value: $12,349
Shares: -536
Change %: -0.98%
Price: $23.04
Shares after: 54,305
Date: 30 Sep 2026
Ownership: Direct
Footnotes: F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote F1

This transaction reported represents the withholding of shares by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting and settlement of the restricted stock units granted on September 25, 2025.

Footnote F2

This sale was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 14, 2025.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.61 to $23.32, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.