---
schema_version: "secwatch.filing_event.v1"
accession: "0000947871-22-000132"
form_type: "8-K"
ticker: "DGX"
cik: "0001022079"
company_name: "QUEST DIAGNOSTICS INC"
filed_at: "2022-02-03T23:59:59+00:00"
generated_at: "2026-06-27T11:23:18.835524+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Quest Diagnostics appoints James E. Davis as CEO-elect; CFO Mark Guinan to retire in 2022

## Summary
- James E. Davis appointed CEO-elect effective Feb. 3, 2022; to become CEO and President on Nov. 1, 2022.
- Current CEO Steve Rusckowski to remain CEO through Oct. 2022 then serve as Executive Chairman through Mar. 2023.
- CFO Mark Guinan announces retirement in 2022; company begins search for successor.
- Davis currently EVP of General Diagnostics, overseeing >80% of $10.8B 2021 revenue.
- Transition reflects planned succession; no financial impact disclosed.

## SEC filing metadata
- accession: 0000947871-22-000132
- form_type: 8-K
- ticker: DGX
- cik: 0001022079
- company_name: QUEST DIAGNOSTICS INC
- filed_at: 2022-02-03T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1022079/000094787122000132/0000947871-22-000132-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1022079/000094787122000132/ss773888_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000947871-22-000132
- JSON: https://secwatch.observer/filing/0000947871-22-000132.json
- Plain text: https://secwatch.observer/filing/0000947871-22-000132.txt

## Key facts
- Executive change
  Mark J. Guinan departed as Executive Vice President and Chief Financial Officer at QUEST DIAGNOSTICS INC.
  - Action: will retire
  - Role: Executive Vice President and Chief Financial Officer
  source text: Mark J. Guinan, the Company’s Executive Vice President and Chief Financial Officer, will retire in 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1022079/000094787122000132/0000947871-22-000132-index.htm
- Executive change
  Stephen H. Rusckowski changed role as Executive Chairman at QUEST DIAGNOSTICS INC.
  - Action: will serve as Executive Chairman
  - Role: Executive Chairman
  source text: Mr. Rusckowski, 64, currently Chairman, Chief Executive Officer and President, will continue to serve on the Board as Executive Chairman through March 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1022079/000094787122000132/0000947871-22-000132-index.htm
- Executive change
  James E. Davis was appointed as Chief Executive Officer – Elect at QUEST DIAGNOSTICS INC.
  - Action: appointed
  - Role: Chief Executive Officer – Elect
  source text: appointed James E. Davis, currently Executive Vice President, General Diagnostics, to be its next Chief Executive Officer and President, effective November 1, 2022. In addition, Mr. Davis was appointed Chief Executive Officer – Elect, effective February 3, 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1022079/000094787122000132/0000947871-22-000132-index.htm

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