---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-199108"
form_type: "8-K"
ticker: "KRRO"
cik: "0001703647"
company_name: "Korro Bio, Inc."
filed_at: "2023-07-31T23:59:59+00:00"
generated_at: "2026-06-12T22:10:05.118358+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# CSO Christopher Loose resigns; severance includes equity acceleration tied to Korro merger

## Summary
- Christopher Loose resigned as Chief Scientific Officer effective July 28, 2023.
- Severance includes 12 months base salary, COBRA coverage, and $201,744.35 target bonus.
- Unvested time-based equity awards accelerate only if proposed merger with Korro Bio closes by Dec 31, 2023.
- Separation agreement includes standard release of claims and non-disparagement obligations.

## SEC filing metadata
- accession: 0001193125-23-199108
- form_type: 8-K
- ticker: KRRO
- cik: 0001703647
- company_name: Korro Bio, Inc.
- filed_at: 2023-07-31T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1703647/000119312523199108/0001193125-23-199108-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1703647/000119312523199108/d533025d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-199108
- JSON: https://secwatch.observer/filing/0001193125-23-199108.json
- Plain text: https://secwatch.observer/filing/0001193125-23-199108.txt

## Key facts
- Executive change
  Christopher Loose resigned as Chief Scientific Officer at Korro Bio, Inc..
  - Action: resigned
  - Role: Chief Scientific Officer
  source text: On July 28, 2023, Christopher Loose, Ph.D., notified Frequency Therapeutics, Inc. (the “Company”) that he would be resigning from his position as Chief Scientific Officer of the Company, effective July 28, 2023
  evidence_url: https://www.sec.gov/Archives/edgar/data/1703647/000119312523199108/0001193125-23-199108-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.