---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-249567"
form_type: "8-K"
ticker: null
cik: "0001610950"
company_name: "Syneos Health, Inc."
filed_at: "2023-10-03T23:59:59+00:00"
generated_at: "2026-06-10T05:31:46.739011+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Syneos Health appoints Colin Shannon as CEO; Keefe remains on exec team and board

## Summary
- Colin Shannon appointed CEO effective October 3, 2023, succeeding Michelle Keefe.
- Keefe remains a key member of the Executive Leadership Team and on the Board.
- Shannon previously served as Chairman and CEO of PRA Health Sciences, leading its IPO and sale to ICON.
- Keefe served as CEO for 18 months, leading the Company through its going private transaction.

## SEC filing metadata
- accession: 0001193125-23-249567
- form_type: 8-K
- cik: 0001610950
- company_name: Syneos Health, Inc.
- filed_at: 2023-10-03T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1610950/000119312523249567/0001193125-23-249567-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1610950/000119312523249567/d462278d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-249567
- JSON: https://secwatch.observer/filing/0001193125-23-249567.json
- Plain text: https://secwatch.observer/filing/0001193125-23-249567.txt

## Key facts
- Executive change
  Colin Shannon was appointed as Chief Executive Officer at Syneos Health, Inc..
  - Action: appointed
  - Role: Chief Executive Officer
  source text: Colin Shannon has been appointed Chief Executive Officer of the Company, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1610950/000119312523249567/0001193125-23-249567-index.htm
- Executive change
  Michelle Keefe changed role as Chief Executive Officer at Syneos Health, Inc..
  - Action: succeeded
  - Role: Chief Executive Officer
  source text: Mr. Shannon succeeds Michelle Keefe, who will continue her tenure with the Company as a key member of the Executive Leadership Team.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1610950/000119312523249567/0001193125-23-249567-index.htm

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