HR chief at CME Group (CME) sells 5,753 shares in open trade

Rhea-AI Filing Summary

CME Group Inc. senior managing director and Chief HR Officer Hilda Harris Piell reported an open-market sale of 5,753 shares of Class A common stock at an average price of $304.63 per share. Following this transaction, she directly holds 27,702 shares of CME Group stock.

Insider Trade Summary

Net Seller: 5,753 shares ($1,752,536)

Net Sell 1 txn

Insider Piell Hilda Harris

Role Sr MD & Chief HR Officer

Sold 5,753 shs ($1.75M)

Type	Security	Shares	Price	Value
Sale	Common Stock Class A	5,753	$304.63	$1.75M

Holdings After Transaction: Common Stock Class A — 27,702 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 5,753 shares Sale price: $304.63 per share Shares remaining: 27,702 shares +1 more

4 metrics

Shares sold 5,753 shares Open-market sale of Class A common stock

Sale price $304.63 per share Average price for the 5,753-share sale

Shares remaining 27,702 shares Direct holdings after the transaction

Net insider share change -5,753 shares Net sell direction per transaction summary

Key Terms

Form 4, open-market sale, Common Stock Class A, transaction code S, +1 more

5 terms

Form 4 regulatory

"This was recorded as an open-market or private sale transaction under SEC code “S” on Form 4."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

open-market sale financial

"reported an open-market sale of 5,753 shares of Class A common stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock Class A financial

"Hilda Harris Piell sold 5,753 shares of CME Group Class A common stock"

transaction code S regulatory

"Transaction code S in the Form 4 indicates a sale in the open market or a private transaction."

direct ownership financial

"This means the 5,753-share sale and the remaining 27,702 shares are attributed to Hilda Harris Piell’s direct ownership"

Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Piell Hilda Harris

(Last) (First) (Middle)

20 S. WACKER DRIVE

(Street)

CHICAGO ILLINOIS 60606

(City) (State) (Zip)

UNITED STATES

(Country)

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 HR Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

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

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

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

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	05/18/2026		S		5,753	D	$304.63	27,702	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:

Remarks:

	/s/ Elizabeth Hensen, as Attorney-in-Fact for Hilda Harris Piell	05/19/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did CME (CME) report for Hilda Harris Piell?

CME Group reported that executive Hilda Harris Piell completed an open-market sale of 5,753 Class A common shares. The transaction was filed on Form 4 and reflects routine insider trading disclosure required for company officers.

How many CME (CME) shares did the executive sell and at what price?

Hilda Harris Piell sold 5,753 shares of CME Group Class A common stock at an average price of $304.63 per share. This was recorded as an open-market or private sale transaction under SEC code “S” on Form 4.

How many CME (CME) shares does Hilda Harris Piell own after the sale?

After the reported sale, Hilda Harris Piell directly holds 27,702 shares of CME Group Class A common stock. This post-transaction balance is disclosed in the Form 4 as her remaining direct ownership position.

What does transaction code S mean in the CME (CME) Form 4 filing?

Transaction code S in the Form 4 indicates a sale in the open market or a private transaction. For CME Group, Hilda Harris Piell’s 5,753-share trade at $304.63 per share is classified with this sale code.

Is the CME (CME) insider transaction a direct or indirect holding change?

The filing shows the transaction as affecting a direct holding, labeled with ownership code “D”. This means the 5,753-share sale and the remaining 27,702 shares are attributed to Hilda Harris Piell’s direct ownership, not through an intermediary entity.