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  4. [Form 4] CME GROUP INC. Insider Trading Activity

CME Group director sells 500 shares at $280

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

CME GROUP INC. (CME) director Elizabeth A. Cook reported the sale of 500 shares of Class A common stock on September 14, 2026 at $280.11 per share through an entity described as a trust. Following this transaction, the trust holds 17,916 shares, and a separate joint account is reported holding 20 shares, both as indirect ownership. No Rule 10b5-1 trading plan is reported for these transactions.

Positive

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Negative

  • None.
Insider Cook Elizabeth A
Role Director
Sold 500 shs ($140K)
Type Security Shares Price Value
Sale Common Stock Class A 500 $280.11 $140K
holding Common Stock Class A -- -- --
Holdings After Transaction: Common Stock Class A — 17,916 shares (Indirect, by Trust); Common Stock Class A — 20 shares (Indirect, By Joint Account)
Shares sold 500 shares Class A common stock sold on September 14, 2026
Sale price per share $280.11 per share Reported price for the September 14, 2026 sale
Indirect holdings by trust after transaction 17,916 shares Class A common stock held indirectly by trust after sale
Indirect holdings by joint account 20 shares Class A common stock held indirectly through joint account
Net buy/sell shares in filing -500 shares Net result of reported non-derivative transactions
indirect financial
"All reported CME shares are held <b>indirectly</b>."
Common Stock Class A financial
"sale of CME <b>Class A common stock</b> was executed"
Rule 10b5-1 regulatory
"No <b>Rule 10b5-1</b> trading plan is reported"
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.
Form 4 regulatory
"after this <b>Form 4</b>?"
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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did CME director Elizabeth A. Cook report?
Elizabeth A. Cook reported a sale of 500 shares of CME Class A common stock on September 14, 2026, executed through an indirectly owned trust at a reported price of $280.11 per share.

How many CME (CME) shares does Elizabeth A. Cook report holding after this Form 4?
After the reported transaction, Elizabeth A. Cook reports 17,916 shares of CME Class A common stock held indirectly by a trust and an additional 20 shares held indirectly through a joint account.

Was the CME (CME) insider sale by Elizabeth A. Cook made under a Rule 10b5-1 plan?
No. The filing indicates that the Rule 10b5-1 checkbox is not affirmed, and there is no footnote stating the sale was made pursuant to a Rule 10b5-1 trading plan.

What price did Elizabeth A. Cook receive per CME (CME) share in this sale?
The sale of CME Class A common stock reported by Elizabeth A. Cook was executed at a reported price of $280.11 per share on September 14, 2026.

Are the CME (CME) shares in this Form 4 held directly or indirectly by Elizabeth A. Cook?
All reported CME shares are held indirectly. 17,916 shares are held “by Trust,” and 20 shares are held “By Joint Account,” as stated in the nature of ownership fields.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →
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SEC Form 4
FORM 4UNITED 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*
Cook Elizabeth A
(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock Class A09/14/2026S500D$280.1117,916Iby Trust
Common Stock Class A20IBy Joint Account
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Elizabeth Hensen, as Attorney-in-Fact for Elizabeth A. Cook09/14/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

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