# EDGAR Filing Document

**Accession Number:** 0001681087
**File Stem:** 0001193125-25-158193
**Filing Date:** 2025-7
**Character Count:** 2784
**Document Hash:** a3532d5870a5d9e9fab8afda539c5097
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-158193.hdr.sgml**: 20250812

**ACCESSION NUMBER**: 0001193125-25-158193

**CONFORMED SUBMISSION TYPE**: CORRESP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250711

**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:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** CORRESP

**BUSINESS ADDRESS:**
- **STREET 1:** 490 ARSENAL WAY
- **STREET 2:** SUITE 210
- **CITY:** WATERTOWN
- **STATE:** MA
- **ZIP:** 02472
- **BUSINESS PHONE:** (339) 666-3320

**MAIL ADDRESS:**
- **STREET 1:** 490 ARSENAL WAY
- **STREET 2:** SUITE 210
- **CITY:** WATERTOWN
- **STATE:** MA
- **ZIP:** 02472

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

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

**TECTONIC THERAPEUTIC, INC.** 

490 Arsenal Way, Suite 210

Watertown, MA 02472

(339) 666-3320

July 11, 2025

***Via EDGAR***

U.S. Securities and Exchange Commission

Division of Corporation Finance

Office of Information Technologies and Services

100 F Street, N.E.

Washington, D.C. 20549

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| | |
|:---|:---|
| Re: | **Tectonic Therapeutic, Inc.** |

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**Registration Statement on Form S-3** 

**File No. 333-288539** 

Ladies and Gentlemen:

In accordance with Rule 461 under the Securities Act of 1933, as amended, the undersigned registrant (the "***Registrant***") hereby requests that the U.S. Securities and Exchange Commission (the "***Commission***") take appropriate action to cause the Registration Statement on Form S-3 (File No. 333-288539) (the "***Registration Statement***") to become effective on Tuesday, July 15, 2025, at 4:00 p.m., Eastern Time, or as soon as practicable thereafter, or at such later time as the Registrant may orally request via telephone call to the staff of the Commission (the "***Staff***"). The Registrant hereby authorizes Brandon Fenn of Cooley LLP, counsel to the Registrant, to make such request on its behalf.

Once the Registration Statement has been declared effective, please orally confirm that event with Brandon Fenn of Cooley LLP, counsel to the Registrant, at (212) 479-6626, or in his absence Minkyu Park of Cooley LLP at (212) 479-6588.

Very truly yours,

---

| | |
|:---|:---|
| **TECTONIC THERAPEUTIC, INC.** | **TECTONIC THERAPEUTIC, INC.** |
| By: | /s/ Daniel Lochner |
| Name: | Daniel Lochner |
| Title: | Chief Financial Officer |

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cc: Brandon Fenn, Cooley LLP

Minkyu Park, Cooley LLP