# EDGAR Filing Document

**Accession Number:** 0001681087
**File Stem:** 0001193125-26-177502
**Filing Date:** 2026-4
**Character Count:** 4318
**Document Hash:** 3a740b91cbb0dca66eda7f35bd75e79a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-177502.hdr.sgml**: 20260424

**ACCESSION NUMBER**: 0001193125-26-177502

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260424

**DATE AS OF CHANGE**: 20260424

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Tectonic Therapeutic, Inc.
- **CENTRAL INDEX KEY:** 0001681087
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 810710585
- **STATE OF INCORPORATION:** NY
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38537
- **FILM NUMBER:** 26895096

**BUSINESS ADDRESS:**
- **STREET 1:** 490 ARSENAL WAY
- **STREET 2:** SUITE 200
- **CITY:** WATERTOWN
- **STATE:** MA
- **BUSINESS PHONE:** (339) 666-3320

**MAIL ADDRESS:**
- **STREET 1:** 490 ARSENAL WAY
- **STREET 2:** SUITE 200
- **CITY:** WATERTOWN
- **STATE:** MA

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AVROBIO, Inc.
- **DATE OF NAME CHANGE:** 20180131

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AvroBio, Inc.
- **DATE OF NAME CHANGE:** 20160729

**SCHEDULE 14A INFORMATION** 

**Proxy Statement Pursuant to Section 14(a) of** 

**the Securities Exchange Act of 1934** 

Filed by the Registrant ☒

Filed by a party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))** 

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material under § 240.14a-12

## TECTONIC THERAPEUTIC, INC.
**(Name of Registrant as Specified in Its Charter)** 

**(Name of Person(s) Filing Proxy Statement if other than the Registrant)** 

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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Your Vote Counts! TECTONIC THERAPEUTIC, INC. 2026 Annual Meeting Vote by June 7, 2026 11:59 PM ET TECTONIC THERAPEUTIC, INC. 490 ARSENAL WAY SUITE 200 WATERTOWN, MA 02472 V96457-P49455 You invested in TECTONIC THERAPEUTIC, INC. and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on June 8, 2026. Get informed before you vote View the Notice and Proxy Statement and Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 25, 2026. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Vote Virtually at the Meeting\* Point your camera here and June 8, 2026 9:00 AM, EDT vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/TECX2026 \*Please check the meeting materials for any special requirements for meeting attendance.

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![LOGO](g99019g04v01.jpg)

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Voting Items Recommends 1. Election of Directors Nominees: 1a. Timothy A. Springer, Ph.D. For 1b. Stefan Vitorovic, M.S., M.B.A. For 2. Ratification of the appointment of Deloitte & Touche LLP as the Company's independent registered public accounting For firm for the fiscal year ending December 31, 2026. 3. Advisory approval of the compensation of the Company's Named Executive Officers. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings".