---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-210291"
form_type: "8-K"
ticker: "KRRO"
cik: "0001703647"
company_name: "Korro Bio, Inc."
filed_at: "2026-05-07T23:59:59+00:00"
generated_at: "2026-05-14T21:52:21.770395+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Korro Bio Q1 net loss narrows to $19.6M; cash at $157M; KRRO-121 filing on track for H2 2026

## Summary
- Net loss of $19.6M vs $23.4M in Q1 2025; R&D spend down to $12.9M from $19.7M.
- Cash, equivalents and marketable securities $157.1M as of March 31 (up from $85.2M), extending runway into H2 2028.
- Closed oversubscribed $85M private placement led by Venrock Healthcare Capital Partners.
- KRRO-121 regulatory filing for UCD/HE on track for H2 2026; AATD GalNAc candidate expected Q2 2026.
- No collaboration revenue due to 12-month pause of Novo Nordisk partnership.

## SEC filing metadata
- accession: 0001193125-26-210291
- form_type: 8-K
- ticker: KRRO
- cik: 0001703647
- company_name: Korro Bio, Inc.
- filed_at: 2026-05-07T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1703647/000119312526210291/0001193125-26-210291-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1703647/000119312526210291/krro-20260507.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-210291
- JSON: https://secwatch.observer/filing/0001193125-26-210291.json
- Plain text: https://secwatch.observer/filing/0001193125-26-210291.txt

## Source-grounded claims
- claim_id: 872e5903f3599498b0d1e4c694f78fbf19ab5e60
  claim: Korro Bio, Inc. reported first quarter ended March 31, 2026 results: net income $19.6 million.
  evidence_excerpt: Korro’s net loss was $19.6 million for the three months ended March 31, 2026
  evidence_url: https://www.sec.gov/Archives/edgar/data/1703647/000119312526210291/0001193125-26-210291-index.htm

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