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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended September 30 , 2021 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware ( State or other jurisdiction of incorporation or organization ) For the transition period from to Commission File Number 000-23554 StoneX Group Inc. ( Exact name of registrant as specified in its charter ) 230 Park Ave , 10th Floor New York , NY 10169 ( Address of principal executive offices ) ( Zip Code ) ( Registrant's Securities registered under Section 12 ( b ) of the Act : Title of Each Class Common Stock , $ 0.01 par value ( 212 ) 485-3500 telephone number , including area code ) Trading Symbol SNEX 59-2921318 ( I.R.S. Employer Identification No. ) Name of each exchange on which registered The Nasdaq Stock Market LLC Securities registered under Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes ☐ Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No No X No X Indicate by check mark whether the registrant has submitted electronically , every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes No U ( Do not check if a smaller reporting company ) Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer ” , “ accelerated filer ” , “ smaller reporting company ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act . Large Accelerated filer Non - accelerated filer Accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No As of March 31 , 2021 , the aggregate market value of the registrant's common stock held by non - affiliates of the registrant was approximately $ 793.8 million . As of November 24 , 2021 , there were 19,947,689 shares of the registrant's common stock outstanding .