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v3.25.3

Condensed Financial Information of Parent Company Only Disclosure - Condensed Statements of Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | $ 132,378.2 | $ 99,887.8 | $ 60,856.1
Interest expense | 1,402.7 | 1,115.7 | 802.2
Net operating revenues | 2,052.8 | 1,767.2 | 1,621.0
Non-interest expenses: |  |  |
Compensation and benefits | 1,107.7 | 942.4 | 868.6
Trade systems and market information | 83.1 | 79.1 | 74.0
Occupancy and equipment rental | 55.7 | 49.0 | 40.4
Selling and marketing | 50.5 | 52.6 | 54.0
Professional fees | 86.3 | 69.7 | 57.0
Travel and business development | 33.0 | 28.4 | 24.8
Non-trading technology and support | 87.3 | 73.4 | 61.6
Depreciation and amortization | 67.5 | 53.1 | 51.0
Communications | 9.3 | 8.5 | 9.1
Other | 66.0 | 65.1 | 66.4
Total compensation and other expenses | 1,649.5 | 1,421.9 | 1,323.4
Gain on acquisitions and other gains, net | 5.5 | 8.8 | 25.4
Income before tax | 408.8 | 354.1 | 323.0
Income tax benefit | (102.9) | (93.3) | (84.5)
Net income | 305.9 | 260.8 | 238.5
Principal gains, net |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 1,247.2 | 1,189.6 | 1,079.9
Consulting, management, and account fees |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 205.9 | 167.2 | 159.0
Interest income |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 1,734.3 | 1,396.8 | 987.6
StoneX Group |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 766.5 | 711.7 | 704.5
Equity earnings of subsidiaries | 512.7 | 428.8 | 370.5
Interest expense | 95.6 | 92.2 | 83.1
Net operating revenues | 670.9 | 619.5 | 621.4
Non-interest expenses: |  |  |
Compensation and benefits | 129.9 | 137.3 | 137.9
Trade systems and market information | 8.1 | 9.5 | 10.2
Occupancy and equipment rental | 10.1 | 10.7 | 9.3
Selling and marketing | 2.2 | 5.5 | 2.2
Professional fees | 26.4 | 13.2 | 12.7
Travel and business development | 4.1 | 3.3 | 3.1
Non-trading technology and support | 59.5 | 49.4 | 37.4
Depreciation and amortization | 18.0 | 16.6 | 13.7
Communications | 2.6 | 2.9 | 3.4
Management services fees to affiliates | 151.8 | 140.4 | 188.4
Other | 15.3 | 16.5 | 12.1
Total compensation and other expenses | 428.0 | 405.3 | 430.4
Gain on acquisitions and other gains, net | 0.1 | 7.0 | 2.1
Income before tax | 243.0 | 221.2 | 193.1
Income tax benefit | 62.9 | 39.6 | 45.4
Net income | 305.9 | 260.8 | 238.5
StoneX Group | Management fees from affiliates |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 245.3 | 274.2 | 328.7
StoneX Group | Principal gains, net |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 0.4 | (0.6) | 1.8
StoneX Group | Consulting, management, and account fees |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | 0.0 | 0.0 | 0.2
StoneX Group | Interest income |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenues | $ 8.1 | $ 9.3 | $ 3.3

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