StoneX officer Mark Maurer proposes $3.19M share sale

Four earlier common-share sales by Mark Maurer are listed for July 22, August 7, September 14 and September 15, 2026.

Rhea-AI Filing Summary

StoneX Group Inc. officer Mark Maurer reported a proposed sale of 52,953 common shares, with an aggregate market value of $3,194,042 and an approximate sale date of October 12, 2026. Merrill Lynch is listed as the broker. The transaction is identified as Stock Plan Activity, with the issuer listed as the source of the shares.

Key Figures

Proposed sale: 52,953 common shares Aggregate market value: $3,194,042 Shares sold: 50,528 shares +1 more

4 metrics

Proposed sale 52,953 common shares Approximate sale date: October 12, 2026

Aggregate market value $3,194,042 Proposed sale

Shares sold 50,528 shares September 15, 2026

Gross proceeds $3,385,042 September 15, 2026

Key Terms

Rule 144, Stock Plan Activity

2 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock Plan Activity financial

"Stock Plan Activity"

FAQ

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

How many SNEX shares does Mark Maurer plan to sell?

Mark Maurer reported a proposed sale of 52,953 common shares, with an aggregate market value of $3,194,042 and an approximate sale date of October 12, 2026. Merrill Lynch is listed as the broker.

What previous SNEX share sales by Mark Maurer are listed?

Four sales are listed: 52,376 shares for $3,891,026 on July 22, 2026; 52,648 shares for $3,486,284 on August 7, 2026; 52,564 shares for $3,616,214 on September 14, 2026; and 50,528 shares for $3,385,042 on September 15, 2026.

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

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Available on EDGAR 10/13/2026 - 09:12 AM EDT Accepted by SEC EDGAR 10/13/2026 - 09:11 AM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001662210
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	StoneX Group Inc.
SEC File Number
Address of Issuer	230 Park Ave 10th Floor New York NEW YORK 10169
Phone	2124853500
Name of Person for Whose Account the Securities are To Be Sold	Mark Maurer
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Merrill Lynch 1800 K ST NW Suite 800 Washington DC 20006	52953	3194042	120616735	10/12/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/12/2026	Stock Plan Activity	Issuer			52953	10/12/2026	n/a

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	09/15/2026	50528	3385042
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	09/14/2026	52564	3616214
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	08/07/2026	52648	3486284
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	07/22/2026	52376	3891026

144: Remarks and Signature

Remarks
Date of Notice	10/12/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/12/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Mark Maurer
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)