---
schema_version: "secwatch.filing_event.v1"
accession: "0001156375-25-000190"
form_type: "8-K"
ticker: "CME"
cik: "0001156375"
company_name: "CME GROUP INC."
filed_at: "2025-09-11T23:59:59+00:00"
generated_at: "2026-05-17T06:50:04.360314+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# CME Group CAO Jack Tobin to retire; will stay through Oct 30, 2026

## Summary
- Jack Tobin, Managing Director and Chief Accounting Officer, notified retirement on Sept 9, 2025.
- He will remain CAO until Oct 30, 2026, to support transition.
- Tobin served as CAO since 2015 and has been with CME for over 23 years.
- Retirement is voluntary, not due to any disagreements over accounting or policies.
- Company will initiate search for successor; Tobin to assist with transition.

## SEC filing metadata
- accession: 0001156375-25-000190
- form_type: 8-K
- ticker: CME
- cik: 0001156375
- company_name: CME GROUP INC.
- filed_at: 2025-09-11T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1156375/000115637525000190/0001156375-25-000190-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1156375/000115637525000190/cme-20250909.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001156375-25-000190
- JSON: https://secwatch.observer/filing/0001156375-25-000190.json
- Plain text: https://secwatch.observer/filing/0001156375-25-000190.txt

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