=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-10
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: CME GROUP INC. (CME)
CIK: 0001156375
--- Reporting Owner ---
Name: DUFFY TERRENCE A
CIK: 0001212809
Role: Director, Officer (Chairman and CEO)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock Class A
Date: 2026-09-10 | Code: S (Open market sale)
Shares: -14,372 | Price: $274.41
Total Value: $3,943,820.52
Shares Owned After: 41,258 | Ownership: D (Direct)
Footnotes:
[F1] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $273.875 to $274.85, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
[Transaction #2]
Security: Common Stock Class A
Date: 2026-09-10 | Code: S (Open market sale)
Shares: -628 | Price: $275.03
Total Value: $172,718.84
Shares Owned After: 40,630 | Ownership: D (Direct)
Footnotes:
[F2] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $274.9056 to $275.0804, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
--- Footnotes (Complete Index) ---
F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $273.875 to $274.85, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $274.9056 to $275.0804, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
--- Signature ---
/s/ /s/ Elizabeth Hensen, as Attorney-in-Fact for Terrence A. Duffy (2026-09-11)
