# EDGAR Filing Document

**Accession Number:** 0001703647
**File Stem:** 9999999995-26-000894
**Filing Date:** 2026-3
**Character Count:** 1433
**Document Hash:** cafa336ce1a1d438281b4bf9c07cfb12
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-26-000894.hdr.sgml**: 20260323

**ACCESSION NUMBER**: 9999999995-26-000894

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260320

**DATE AS OF CHANGE**: 20260323

**EFFECTIVENESS DATE**: 20260320

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Korro Bio, Inc.
- **CENTRAL INDEX KEY:** 0001703647
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 472324450
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-294298
- **FILM NUMBER:** 26779756

**BUSINESS ADDRESS:**
- **STREET 1:** 60 FIRST STREET
- **STREET 2:** 2ND FLOOR, SUITE 250
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02141
- **BUSINESS PHONE:** 617-468-1999

**MAIL ADDRESS:**
- **STREET 1:** 60 FIRST STREET
- **STREET 2:** 2ND FLOOR, SUITE 250
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02141

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Frequency Therapeutics, Inc.
- **DATE OF NAME CHANGE:** 20170412

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

## Notice of Effectiveness

**Date:** March 20, 2026

**Time:** 16:15:00

**Form Type:** S-3

---

**CIK:** 0001703647

**Company Name:** Korro Bio, Inc.

**File Number:** 333-294298