[Form 4] CME GROUP INC. Insider Trading Activity

Rhea-AI Filing Summary

Julie Winkler, Senior Managing Director and Chief Commercial Officer at CME Group (CME), reported insider transactions related to restricted stock vesting and tax-withholding on September 15-16, 2025. On 09/15/2025 she surrendered 1,081 shares at $258.83 to satisfy tax withholding upon vesting and received 3,044 shares at $258.83 from the vesting event, and on 09/16/2025 she surrendered 379 shares at $259.83 for tax withholding. After these transactions she beneficially owned 25,512 Class A shares. The Form 4 was signed on behalf of Ms. Winkler by Margaret Austin Wright on 09/17/2025. The filing shows routine equity vesting and share-withholding to cover taxes; no derivative transactions or additional compensatory arrangements are disclosed in this Form 4.

Positive

• Beneficial ownership increased to 25,512 Class A shares after the reported vesting and withholding transactions

Negative

• None.

Insights

Financial Analyst

TL;DR: Routine restricted-stock vesting and share surrender for tax withholding increased reported holdings to 25,512 Class A shares; not material to valuation.

This Form 4 documents an equity compensation vesting event and the statutory tax-withholding action that accompanied it. The reporting person received 3,044 Class A shares on 09/15/2025 and surrendered a total of 1,460 shares across 09/15-09/16/2025 to satisfy withholding, leaving 25,512 shares beneficially owned. These are standard insider compensation mechanics and do not indicate open-market purchases or sales for investment purposes. There are no derivative exercises or other transactions disclosed that would materially change outstanding insider exposure.

Corporate Governance Expert

TL;DR: The filing reflects routine executive compensation administration; disclosures are clear and timely under Section 16 reporting rules.

The report names Ms. Julie Winkler and lists her role as Senior Managing Director Chief Commercial Officer. Transactions are identified with dates, quantities, and per-share amounts, and the explanatory remarks state that shares were surrendered to cover tax withholding upon vesting. The Form 4 appears properly completed and signed via authorized filer's signature dated 09/17/2025. No indications of unusual insider trading patterns or related-party transactions are present in this filing.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Winkler Julie

(Last) (First) (Middle)

20 S. WACKER DRIVE

(Street)

CHICAGO IL 60606

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CME GROUP INC. [ CME ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Sr MD Chief Commercial Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock Class A	09/15/2025		F		1,081(1)	D	$258.83	22,847	D
Common Stock Class A	09/15/2025		A		3,044	A	$258.83	25,891	D
Common Stock Class A	09/16/2025		F		379(2)	D	$259.83	25,512	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Ms. Winkler surrendered shares to the Company in order to fulfill tax withholding obligations upon the vesting of restricted stock on September 15, 2025.

2. Ms. Winkler surrendered shares to the Company in order to fulfill tax withholding obligations upon the vesting of restricted stock on September 16, 2025.

Remarks:

	By: Margaret Austin Wright For: Julie Marie Winkler	09/17/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transactions did Julie Winkler report on the Form 4 for CME (CME)?

The filing reports the vesting of 3,044 Class A shares on 09/15/2025 and the surrender of 1,081 shares on 09/15/2025 and 379 shares on 09/16/2025 to satisfy tax withholding.

How many Class A shares does Julie Winkler beneficially own after the reported transactions?

Following the transactions reported in the Form 4, Ms. Winkler beneficially owned 25,512 Class A shares.

What were the per-share prices shown on the Form 4 for the transactions?

The surrender and acquisition transactions were reported at $258.83 per share on 09/15/2025 and $259.83 per share on 09/16/2025.

Why were shares surrendered in these transactions according to the filing?

The explanatory remarks state that Ms. Winkler surrendered shares to the company to fulfill tax withholding obligations upon the vesting of restricted stock on the specified dates.

Who signed the Form 4 and when was it filed?

The Form 4 was signed on behalf of Julie Marie Winkler by Margaret Austin Wright and dated 09/17/2025.