---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-056916"
form_type: "8-K"
ticker: null
cik: "0001656634"
company_name: "Gritstone bio, Inc."
filed_at: "2024-05-09T23:59:59+00:00"
generated_at: "2026-06-02T06:12:38.598008+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Gritstone reports Q1 cash $52.8M; GRANITE Phase 2 MSS-CRC shows favorable PFS trend (HR 0.82 overall, 0.52 high-risk)

## Summary
- Cash, equivalents and marketable securities $52.8M as of March 31, 2024, down from $86.9M at Dec 31, 2023.
- Preliminary Phase 2 GRANITE data: PFS hazard ratio 0.82 overall (95% CI 0.34-1.67) and 0.52 in high-risk group (95% CI 0.15-1.38); mature data expected Q3 2024.
- Completed public offering in April 2024 for gross proceeds of $32.5M; appointed Stephen Webster to Board.
- R&D expenses $33.0M, G&A $8.5M for Q1 2024; collaboration & grant revenue $1.7M.

## SEC filing metadata
- accession: 0000950170-24-056916
- form_type: 8-K
- cik: 0001656634
- company_name: Gritstone bio, Inc.
- filed_at: 2024-05-09T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1656634/000095017024056916/0000950170-24-056916-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1656634/000095017024056916/grts-20240509.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-056916
- JSON: https://secwatch.observer/filing/0000950170-24-056916.json
- Plain text: https://secwatch.observer/filing/0000950170-24-056916.txt

## Key facts
- Earnings Releases
  Gritstone bio, Inc. reported financial results for first quarter ended March 31, 2024.
  - Period: first quarter ended March 31, 2024
  - Result: reported results
  source text: On May 9, 2024, Gritstone bio, Inc. issued a press release announcing its financial results for the first quarter ended March 31, 2024 and provided a business update.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000095017024056916/0000950170-24-056916-index.htm

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