---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-262560"
form_type: "8-K"
ticker: null
cik: "0001845337"
company_name: "Day One Biopharmaceuticals, Inc."
filed_at: "2024-11-20T23:59:59+00:00"
generated_at: "2026-05-29T22:06:46.397891+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Day One Biopharma R&D Head Samuel Blackman retiring; to advise

## Summary
- Samuel Blackman, co-founder and Head of R&D, will retire effective end of 2024.
- Blackman served as Head of R&D since May 2023; previously Chief Medical Officer since founding.
- He will remain as a strategic advisor and consultant during search for successor.
- Company has initiated search for new Head of Research & Development.

## SEC filing metadata
- accession: 0001193125-24-262560
- form_type: 8-K
- cik: 0001845337
- company_name: Day One Biopharmaceuticals, Inc.
- filed_at: 2024-11-20T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1845337/000119312524262560/0001193125-24-262560-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1845337/000119312524262560/d856064d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-262560
- JSON: https://secwatch.observer/filing/0001193125-24-262560.json
- Plain text: https://secwatch.observer/filing/0001193125-24-262560.txt

## Key facts
- Executive change
  Samuel Blackman departed as Head of Research & Development at Day One Biopharmaceuticals, Inc..
  - Action: retire
  - Role: Head of Research & Development
  source text: On November 20, 2024, Samuel Blackman, M.D., Ph.D, notified Day One Biopharmaceuticals, Inc. (the “Company”) of his intention to retire from his position as Head of Research & Development of the Company effective at the end of 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1845337/000119312524262560/0001193125-24-262560-index.htm

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