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Regulatory Requirements and Subsidiary Dividend Restrictions (Tables) | 12 Months Ended
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Sep. 30, 2025
Capital and Other Regulatory Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table details the Company’s subsidiaries with a minimum regulatory client money or segregation requirement, as well as the client segregated funds and secured funds of the subsidiary as of September 30, 2025 (in millions):
|  |  |  |  | Client Segregated Funds |  | Client Secured Funds
Subsidiary | Regulatory Authority |  |  |  | Actual |  | Minimum Requirement |  | Actual |  | Minimum Requirement
StoneX Financial Inc. | SEC and CFTC |  |  |  | $ | 7,244.8 |  |  | $ | 7,159.6 |  |  | $ | 260.4 |  |  | $ | 247.1 |
StoneX Financial Ltd | FCA |  |  |  | $ | 1,874.4 |  |  | $ | 1,853.8 |  |  | N/A |  | N/A
StoneX Financial Pte. Ltd. | MAS |  |  |  | $ | 1,062.6 |  |  | $ | 1,049.1 |  |  | N/A |  | N/A
R.J. O’Brien & Associates LLC | CFTC and NFA |  |  |  | $ | 6,293.6 |  |  | $ | 6,015.7 |  |  | $ | 280.8 |  |  | $ | 248.2 |
R.J. O’Brien Limited | FCA |  |  |  | $ | 460.3 |  |  | $ | 460.0 |  |  | N/A |  | N/A
The following table details the Company’s subsidiaries with a minimum regulatory net capital requirement in excess of $10.0 million as well as the actual regulatory capital of the subsidiary as of September 30, 2025 (in millions):
Subsidiary | Regulatory Authority |  |  |  | Actual |  | Minimum Requirement
StoneX Financial Inc. | SEC and CFTC |  |  |  | $ | 519.1 |  |  | $ | 362.8 |
StoneX Financial Ltd | FCA |  |  |  | $ | 557.4 |  |  | $ | 457.1 |
GAIN Capital Group, LLC | CFTC and NFA |  |  |  | $ | 65.8 |  |  | $ | 30.4 |
StoneX Financial Pte. Ltd. | MAS |  |  |  | $ | 127.4 |  |  | $ | 26.3 |
StoneX Markets LLC | CFTC and NFA |  |  |  | $ | 252.5 |  |  | $ | 154.4 |
R.J. O’Brien & Associates LLC | CFTC and NFA |  |  |  | $ | 367.4 |  |  | $ | 275.8 |
R.J. O’Brien Limited | FCA |  |  |  | $ | 39.1 |  |  | $ | 20.3 |

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- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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