Were Mark Lowry Maurer’s StoneX Group (SNEX) share sales pre-planned?

Yes. A footnote explains the sales were effected under a Rule 10b5-1 trading plan adopted on February 12, 2026. Such plans allow executives to schedule trades in advance, helping separate routine liquidity events from discretionary market-timing decisions.

StoneX Group (SNEX) CRO exercises options and sells 46,248 shares under 10b5-1 plan

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

StoneX Group Inc. Chief Risk Officer Mark Lowry Maurer exercised stock options and sold shares in a pre-planned set of transactions. On Common Stock, he exercised 46,248 shares at an exercise price of $13.34 per share and then executed open-market sales of 34,706 shares at an average price of $135.3106 and 11,542 shares at an average price of $133.6278.

After these trades, he directly owned 135,496 shares of Common Stock. A footnote states the sales were carried out under a Rule 10b5-1 trading plan adopted on February 12, 2026, indicating the disposition was pre-scheduled rather than timed opportunistically.

Insider Trade Summary 10b5-1

Net Seller: 46,248 shares ($6,238,422)

Net Sell 4 txns

Insider Maurer Mark Lowry

Role null

Sold 46,248 shs ($6.24M)

Type	Security	Shares	Price	Value
Sale	Common Stock	11,542	$133.6278	$1.54M
Exercise	Stock Options	46,248	$0.00	--
Exercise	Common Stock	46,248	$13.34	$617K
Sale	Common Stock	34,706	$135.3106	$4.70M

Holdings After Transaction: Common Stock — 135,496 shares (Direct, null); Stock Options — 522,492 shares (Direct, null)

Footnotes (1)

This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 12, 2026. 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

Options exercised: 46,248 shares Exercise price: $13.34/share Sale 1 volume: 34,706 shares +5 more

8 metrics

Options exercised 46,248 shares Common Stock options exercised at $13.34 per share

Exercise price $13.34/share Stock Options on Common Stock

Sale 1 volume 34,706 shares Common Stock open-market sale at $135.3106 average price

Sale 1 price $135.3106/share Average price for 34,706-share Common Stock sale

Sale 2 volume 11,542 shares Common Stock open-market sale at $133.6278 average price

Sale 2 price $133.6278/share Average price for 11,542-share Common Stock sale

Shares owned after 135,496 shares Direct Common Stock holdings following reported transactions

Option expiration December 5, 2026 Original expiration date of exercised Stock Options

Key Terms

Rule 10b5-1 trading plan, open-market sale, Stock Options, Exercise or conversion of derivative security, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 12, 2026."

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.

open-market sale financial

"transaction_action: open-market sale"

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.

Stock Options financial

"security_title: 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 or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Form 4 Insider Transactions: What Each Field Means →

06/17/2026 - 04:55 PM

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^*

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)
06/15/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock⁽¹⁾	06/15/2026		M		46,248	A	$13.34	181,744	D
Common Stock⁽¹⁾	06/15/2026		S		34,706	D	$135.3106⁽²⁾	147,038	D
Common Stock	06/16/2026		S		11,542	D	$133.6278⁽²⁾	135,496	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Options⁽¹⁾	$13.34	06/15/2026		M			46,248	12/05/2021	12/05/2026	Common Stock	46,248	$0	522,492	D

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 12, 2026.

2. 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	06/16/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did StoneX Group (SNEX) executive Mark Lowry Maurer report on this Form 4?

He reported an option exercise and share sales. Maurer exercised 46,248 stock options at $13.34 and sold 34,706 and 11,542 Common Stock shares in open-market transactions at average prices above $133 per share, updating his direct ownership.

How many StoneX Group (SNEX) shares did Mark Lowry Maurer sell and at what prices?

He sold 34,706 Common Stock shares at an average price of $135.3106 and 11,542 shares at an average price of $133.6278. Both transactions were coded as open-market sales, reflecting disposals of already-held equity after exercising options.

What stock options did Mark Lowry Maurer exercise in StoneX Group (SNEX)?

He exercised options on 46,248 underlying Common Stock shares at an exercise price of $13.34 per share. The derivative entry shows these Stock Options, originally exercisable from December 5, 2021 and expiring December 5, 2026, were converted into common shares.

How many StoneX Group (SNEX) shares does Mark Lowry Maurer own after these transactions?

Following the reported sales of Common Stock, Maurer directly owned 135,496 shares. This figure reflects his remaining non-derivative Common Stock position after exercising 46,248 options and then selling an equal number of shares in the open market.