---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-205020"
form_type: "8-K"
ticker: "LYEL"
cik: "0001806952"
company_name: "Lyell Immunopharma, Inc."
filed_at: "2025-09-16T23:59:59+00:00"
generated_at: "2026-05-17T06:31:13.039504+00:00"
event_type: "leadership"
sentiment: "negative"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Lyell Immunopharma CFO Charles Newton resigns effective Oct 31, 2025

## Summary
- Charles Newton resigns as CFO and principal financial/accounting officer, effective October 31, 2025.
- No disagreements cited; Newton may provide consulting services through April 30, 2026.
- Company plans to conduct a search for a new CFO; no replacement named yet.

## SEC filing metadata
- accession: 0001193125-25-205020
- form_type: 8-K
- ticker: LYEL
- cik: 0001806952
- company_name: Lyell Immunopharma, Inc.
- filed_at: 2025-09-16T23:59:59+00:00
- event_type: leadership
- sentiment: negative
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1806952/000119312525205020/0001193125-25-205020-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1806952/000119312525205020/d948282d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-205020
- JSON: https://secwatch.observer/filing/0001193125-25-205020.json
- Plain text: https://secwatch.observer/filing/0001193125-25-205020.txt

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