---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-24-042833"
form_type: "8-K"
ticker: "CCCC"
cik: "0001662579"
company_name: "C4 Therapeutics, Inc."
filed_at: "2024-10-15T23:59:59+00:00"
generated_at: "2026-05-30T14:37:03.836365+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# C4 Therapeutics appoints Paige Mahaney as CSO; Stewart Fisher retires effective Oct 28

## Summary
- Paige Mahaney, Ph.D., appointed Chief Scientific Officer effective October 28, 2024; succeeds Stewart Fisher.
- Fisher will remain as Senior Scientific Advisor through Dec 31, 2024, then consultant through Dec 31, 2025.
- Mahaney joins from Exelixis; receives $510K base salary, $150K sign-on bonus, and 345,600 stock options.
- Fisher's retirement not due to any disagreement; entered consulting agreement for continued vesting of equity.
- Mahaney brings over 25 years pharma experience, most recently SVP of drug discovery at Exelixis.

## SEC filing metadata
- accession: 0001628280-24-042833
- form_type: 8-K
- ticker: CCCC
- cik: 0001662579
- company_name: C4 Therapeutics, Inc.
- filed_at: 2024-10-15T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1662579/000162828024042833/0001628280-24-042833-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1662579/000162828024042833/cccc-20241015.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-24-042833
- JSON: https://secwatch.observer/filing/0001628280-24-042833.json
- Plain text: https://secwatch.observer/filing/0001628280-24-042833.txt

## Key facts
- Executive change
  Stewart Fisher retired as Chief Scientific Officer at C4 Therapeutics, Inc..
  - Action: retired
  - Role: Chief Scientific Officer
  source text: On October 1, 2024, Stewart Fisher, Ph.D. informed us of his intent to retire from the role of Chief Scientific Officer of C4 Therapeutics, Inc.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1662579/000162828024042833/0001628280-24-042833-index.htm
- Executive change
  Paige Mahaney was appointed as Chief Scientific Officer at C4 Therapeutics, Inc..
  - Action: appointed
  - Role: Chief Scientific Officer
  source text: On October 15, 2024, the Company announced the appointment of Paige Mahaney, Ph.D. as its Chief Scientific Officer, effective as of October 28, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1662579/000162828024042833/0001628280-24-042833-index.htm

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