---
schema_version: "secwatch.filing_event.v1"
accession: "0001140361-25-027350"
form_type: "8-K"
ticker: "BMY"
cik: "0000014272"
company_name: "BRISTOL MYERS SQUIBB CO"
filed_at: "2025-07-25T23:59:59+00:00"
generated_at: "2026-05-18T00:56:30.788124+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Bristol Myers Squibb appoints Cristian Massacesi as CMO; Samit Hirawat departs by Nov 1

## Summary
- Cristian Massacesi, M.D., named EVP, Chief Medical Officer and Head of Development, effective August 1, 2025.
- Samit Hirawat, M.D., steps down as CMO and Head of Development on August 1; will remain advisor through November 1, 2025.
- Massacesi will oversee early- and late-stage development across all therapeutic areas and serve on Executive Leadership Team.
- Hirawat leaves after six years; company cites his role in advancing pipeline across oncology, hematology, immunology, cardiovascular, neuroscience.

## SEC filing metadata
- accession: 0001140361-25-027350
- form_type: 8-K
- ticker: BMY
- cik: 0000014272
- company_name: BRISTOL MYERS SQUIBB CO
- filed_at: 2025-07-25T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/14272/000114036125027350/0001140361-25-027350-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/14272/000114036125027350/ef20052589_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001140361-25-027350
- JSON: https://secwatch.observer/filing/0001140361-25-027350.json
- Plain text: https://secwatch.observer/filing/0001140361-25-027350.txt

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