# EDGAR Filing Document

**Accession Number:** 0001907108
**File Stem:** 9999999995-25-003406
**Filing Date:** 2025-11
**Character Count:** 1312
**Document Hash:** 7b1eceb5ccaa3e86f23fa87e25e09394
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-003406.hdr.sgml**: 20251128

**ACCESSION NUMBER**: 9999999995-25-003406

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251126

**DATE AS OF CHANGE**: 20251128

**EFFECTIVENESS DATE**: 20251126

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Lexeo Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001907108
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 854012572
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-291269
- **FILM NUMBER:** 251532236

**BUSINESS ADDRESS:**
- **STREET 1:** 345 PARK AVENUE SOUTH
- **STREET 2:** FLOOR 6
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10010
- **BUSINESS PHONE:** (212) 547-9879

**MAIL ADDRESS:**
- **STREET 1:** 345 PARK AVENUE SOUTH
- **STREET 2:** FLOOR 6
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10010

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** November 26, 2025

**Time:** 16:00:00

**Form Type:** S-3

---

**CIK:** 0001907108

**Company Name:** Lexeo Therapeutics, Inc.

**File Number:** 333-291269