StoneX risk chief sells 52,953 shares under plan

After the exercise, the chief risk officer held 506,250 options; the same-day sale covered 52,953 common shares.

Rhea-AI Filing Summary

StoneX Group Inc. Chief Risk Officer Mark Lowry Maurer exercised options covering 69,372 common shares on October 12, 2026, at an exercise price of $8.90 per share, and sold 52,953 common shares that day at an average price of $60.3488 per share. The sale was reported under a Rule 10b5-1 trading plan. After the exercise, he directly held 506,250 options.

Insider Trade Summary 10b5-1

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Maurer Mark Lowry

Role Insider

Sold 52,953 shs ($3.20M)

Approx. gross sale proceeds $3.20M

Approx. exercise cost $617K

Type	Security	Shares	Price	Value
Exercise	Stock Options	69,372	$0.00	$0.00
Exercise	Common Stock	69,372	$8.90	$617K
Sale	Common Stock F1	52,953	$60.3488	$3.20M

Holdings After Transaction: Stock Options — 506,250 contracts (Direct); Common Stock — 219,663 shares (Direct)

Footnotes (1)

1. F1. The price reported represents an average price. The Reporting Person will provide to the Commission, the issuer and any stockholder, upon request, full information regarding the number of shares sold at each separate price.

Key Figures

Common shares acquired through option exercise: 69,372 shares Exercise price: $8.90 per share Common shares sold: 52,953 shares +2 more

5 metrics

Common shares acquired through option exercise 69,372 shares October 12, 2026

Exercise price $8.90 per share Options exercised on October 12, 2026

Common shares sold 52,953 shares October 12, 2026

Average sale price $60.3488 per share Sale on October 12, 2026

Direct options after exercise 506,250 options Following the October 12, 2026 transaction

Key Terms

Stock Options, exercise price, Rule 10b5-1 trading plan

3 terms

Stock Options financial

"Stock Options"

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

exercise price financial

"exercise price of $8.90 per share"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

Rule 10b5-1 trading plan regulatory

"sale was reported under a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

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

How many SNEX shares did Mark Lowry Maurer sell?

Mark Lowry Maurer, StoneX Group Inc.'s Chief Risk Officer, sold 52,953 common shares on October 12, 2026, at an average price of $60.3488 per share. The sale was reported under a Rule 10b5-1 trading plan.

How many SNEX options did the chief risk officer exercise?

Mark Lowry Maurer exercised options covering 69,372 common shares on October 12, 2026, at an exercise price of $8.90 per share. His reported direct option position after the exercise was 506,250 options.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/14/2026 - 08:00 PM EDT Accepted by SEC EDGAR 10/14/2026 - 08:00 PM EDT Learn about SEC filing dates

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).

X

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^*

Maurer Mark Lowry

(Last) (First) (Middle)

230 SOUTH LASALLE

SUITE 10-500

(Street)

CHICAGO ILLINOIS 60604

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
StoneX Group Inc. [ SNEX ]

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

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Chief Risk Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/12/2026

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	10/12/2026		M		69,372	A	$8.9	272,616	D
Common Stock	10/12/2026		S		52,953	D	$60.3488(1)	219,663	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
Stock Options	$8.9	10/12/2026		M			69,372	12/05/2021	12/05/2026	Common Stock	69,372	$0	506,250	D

Explanation of Responses:

1. The price reported represents an average price. The Reporting Person will provide to the Commission, the issuer and any stockholder, upon request, full information regarding the number of shares sold at each separate price.

Remarks:

	Mark L. Maurer	10/13/2026
	** 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)