StoneX officer plans $3.6M stock sale

An officer of StoneX Group Inc. filed a Rule 144 notice for a planned stock-plan-related sale plus several sizeable sales completed in the prior three months.

Available on EDGAR 09/14/2026 - 05:35 PM EDT Accepted by SEC EDGAR 09/14/2026 - 05:34 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

StoneX Group Inc. (SNEX) has a notice under Rule 144 stating that officer Mark Maurer plans to sell up to 52,564 shares of common stock through Merrill Lynch, with an indicated aggregate market value of $3,616,214. The notice lists StoneX common stock outstanding at 120,616,735 shares and reflects that the planned sale is related to stock plan activity. It also reports several prior common stock sales by Maurer over the past three months.

Key Figures

Shares proposed to be sold: 52,564 shares Aggregate market value of proposed sale: $3,616,214 Common shares outstanding: 120,616,735 shares +4 more

7 metrics

Shares proposed to be sold 52,564 shares Common stock covered by the Rule 144 notice

Aggregate market value of proposed sale $3,616,214 Planned sale of 52,564 common shares

Common shares outstanding 120,616,735 shares StoneX Group Inc. common stock outstanding

Prior sale on August 7, 2026 52,648 shares for $3,486,284 Common stock sold by Mark Maurer in past 3 months

Prior sale on July 22, 2026 52,376 shares for $3,891,026 Common stock sold by Mark Maurer in past 3 months

Prior sale on June 16, 2026 11,542 shares for $1,541,954 Common stock sold by Mark Maurer in past 3 months

Prior sale on June 15, 2026 34,706 shares for $4,694,738 Common stock sold by Mark Maurer in past 3 months

Key Terms

Rule 144, Stock Plan Activity, aggregate market value

3 terms

Rule 144 regulatory

"See the definition of "person" in 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

"Common | 09/14/2026 | Stock Plan Activity | Issuer"

aggregate market value financial

"Common | Merrill Lynch ... | 52564 | 3616214 | 120616735"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does StoneX Group Inc. (SNEX) disclose in this Form 144 filing?

The filing discloses that officer Mark Maurer intends to sell 52,564 shares of StoneX Group Inc. common stock under Rule 144, tied to stock plan activity, through Merrill Lynch, and lists several prior common stock sales in the preceding three months.

How many StoneX (SNEX) shares are proposed to be sold in this Rule 144 notice?

The notice covers a proposed sale of 52,564 shares of StoneX Group Inc. common stock. The planned sale is noted as arising from Stock Plan Activity and is to be executed through Merrill Lynch, with a stated date of September 14, 2026.

What is the aggregate market value of the StoneX (SNEX) shares in the planned Rule 144 sale?

The planned sale of 52,564 shares of StoneX Group Inc. common stock has an indicated aggregate market value of $3,616,214, as stated in the Rule 144 securities information section of the notice.

How many StoneX (SNEX) shares are reported as outstanding in the Form 144?

The Rule 144 notice reports that StoneX Group Inc. has 120,616,735 shares of common stock outstanding. This figure provides context for the relative size of the proposed and recent insider sales disclosed in the filing.

What prior StoneX (SNEX) stock sales by Mark Maurer are listed in the past three months?

The notice lists prior common stock sales by Mark Maurer: 52,648 shares on August 7, 2026 for $3,486,284; 52,376 shares on July 22, 2026 for $3,891,026; 11,542 shares on June 16, 2026 for $1,541,954; and 34,706 shares on June 15, 2026 for $4,694,738.

Who is the insider named in the StoneX Group Inc. (SNEX) Form 144 and what is their role?

The Form 144 names Mark Maurer as the person for whose account the securities are to be sold, and identifies him as an Officer of StoneX Group Inc., with the issuer’s address at 230 Park Ave, 10th Floor, New York, NY 10169.

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

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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	52564	3616214	120616735	09/14/2026	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	09/14/2026	Stock Plan Activity	Issuer			52564	09/14/2026	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	08/07/2026	52648	3486284
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	07/22/2026	52376	3891026
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	06/16/2026	11542	1541954
Mark Maurer 230 Park Ave 10th Floor New York NY 10169	Common	06/15/2026	34706	4694738

144: Remarks and Signature

Remarks
Date of Notice	09/14/2026
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)