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Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Assets |  |
Other Assets | $ 242,121 | $ 158,326
Receivables from broker-dealers and clearing organizations | 1,896,405 | 1,100,850
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 9,105,263 | 6,440,971
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting | (198,463) | (681,878)
Payables to broker-dealers and clearing organizations | 998,276 | 918,566
Interest Rate Swap |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations |  | 2,572
Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 7,343,032 | 5,520,015
Financial instruments owned, at fair value, counterparty and cash collateral netting | (204,775) | (676,905)
Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 3,208,525 | 2,282,637
Equity securities |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 5,717,549 | 3,692,078
Equity securities | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 4,350,396 | 3,158,277
Equity securities | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 3,200,345 | 2,269,299
U.S. and Non-U.S. government obligations |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 1,390,070 | 1,421,000
U.S. and Non-U.S. government obligations | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,670,252 | 1,257,386
Corporate Bonds |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 1,754,517 | 1,249,413
Corporate Bonds | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,207,385 | 967,377
Exchange traded notes |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 26,135 | 73,240
Exchange traded notes | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 10,459 | 41,487
Exchange traded notes | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 8,180 | 13,338
Currency forwards |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting | (198,463) | (681,878)
Currency forwards | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 7,081 | 40,065
Financial instruments owned, at fair value, counterparty and cash collateral netting | (204,775) | (676,905)
Options |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 216,992 | 5,240
Options | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 97,459 | 55,423
Equity investment |  |
Assets |  |
Other Assets | 86,491 | 75,843
Exchange stock |  |
Assets |  |
Other Assets | 1,020 | 812
Interest rate swaps and digital assets |  |
Assets |  |
Receivables from broker-dealers and clearing organizations | 328,934 | 51,595
Receivables linked to digital assets |  |
Assets |  |
Other Assets | 154,610 | 81,671
Receivables from broker-dealers and clearing organizations | 328,934 | 51,595
Liabilities |  |
Payables to broker-dealers and clearing organizations | 181,272 | 134,164
Payables linked to broker dealers and clearing organizations |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations | 181,272 | 136,736
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Other Assets | 155,630 | 82,483
Receivables from broker-dealers and clearing organizations | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 3,384,188 | 1,949,495
Payables to broker-dealers and clearing organizations | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Swap |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 2,068,615 | 1,091,896
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,896,091 | 1,639,404
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 2,933,027 | 1,837,195
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,511,213 | 686,827
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,896,091 | 1,639,404
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and Non-U.S. government obligations |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 234,169 | 107,045
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and Non-U.S. government obligations | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 459,943 | 348,761
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 15
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 885
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency forwards |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency forwards | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Options |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 216,992 | 5,240
Quoted Prices in Active Markets for Identical Assets (Level 1) | Options | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 97,459 | 55,423
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investment |  |
Assets |  |
Other Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock |  |
Assets |  |
Other Assets | 1,020 | 812
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps and digital assets |  |
Assets |  |
Receivables from broker-dealers and clearing organizations | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Receivables linked to digital assets |  |
Assets |  |
Other Assets | 154,610 | 81,671
Receivables from broker-dealers and clearing organizations | 0 | 0
Liabilities |  |
Payables to broker-dealers and clearing organizations | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Payables linked to broker dealers and clearing organizations |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Other Assets | 0 | 0
Receivables from broker-dealers and clearing organizations | 1,567,471 | 1,049,255
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 5,919,538 | 5,173,354
Payables to broker-dealers and clearing organizations | 817,004 | 781,830
Significant Other Observable Inputs (Level 2) | Interest Rate Swap |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations |  | 2,572
Significant Other Observable Inputs (Level 2) | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 5,479,192 | 5,105,024
Significant Other Observable Inputs (Level 2) | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,312,434 | 643,233
Significant Other Observable Inputs (Level 2) | Equity securities |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 2,784,522 | 1,854,883
Significant Other Observable Inputs (Level 2) | Equity securities | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 2,839,183 | 2,471,450
Significant Other Observable Inputs (Level 2) | Equity securities | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,304,254 | 629,895
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 1,155,901 | 1,313,955
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,210,309 | 908,625
Significant Other Observable Inputs (Level 2) | Corporate Bonds |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 1,754,517 | 1,249,413
Significant Other Observable Inputs (Level 2) | Corporate Bonds | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 1,207,385 | 967,377
Significant Other Observable Inputs (Level 2) | Exchange traded notes |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 26,135 | 73,225
Significant Other Observable Inputs (Level 2) | Exchange traded notes | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 10,459 | 40,602
Significant Other Observable Inputs (Level 2) | Exchange traded notes | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 8,180 | 13,338
Significant Other Observable Inputs (Level 2) | Currency forwards |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 198,463 | 681,878
Significant Other Observable Inputs (Level 2) | Currency forwards | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 211,856 | 716,970
Significant Other Observable Inputs (Level 2) | Options |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Options | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Equity investment |  |
Assets |  |
Other Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Exchange stock |  |
Assets |  |
Other Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Interest rate swaps and digital assets |  |
Assets |  |
Receivables from broker-dealers and clearing organizations | 328,934 | 51,595
Significant Other Observable Inputs (Level 2) | Receivables linked to digital assets |  |
Assets |  |
Other Assets | 0 | 0
Receivables from broker-dealers and clearing organizations | 328,934 | 51,595
Liabilities |  |
Payables to broker-dealers and clearing organizations | 181,272 | 134,164
Significant Other Observable Inputs (Level 2) | Payables linked to broker dealers and clearing organizations |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations | 181,272 | 136,736
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Other Assets | 86,491 | 75,843
Receivables from broker-dealers and clearing organizations | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Payables to broker-dealers and clearing organizations | 0 | 0
Significant Unobservable Inputs (Level 3) | Interest Rate Swap |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations |  | 0
Significant Unobservable Inputs (Level 3) | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Equity securities |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Equity securities | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Equity securities | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate Bonds |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate Bonds | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Exchange traded notes |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Exchange traded notes | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Exchange traded notes | Pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Currency forwards |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Currency forwards | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Options |  |
Liabilities |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Options | Not pledged |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Equity investment |  |
Assets |  |
Other Assets | 86,491 | 75,843
Significant Unobservable Inputs (Level 3) | Exchange stock |  |
Assets |  |
Other Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Interest rate swaps and digital assets |  |
Assets |  |
Receivables from broker-dealers and clearing organizations | 0 | 0
Significant Unobservable Inputs (Level 3) | Receivables linked to digital assets |  |
Assets |  |
Other Assets | 0 | 0
Receivables from broker-dealers and clearing organizations | 0 | 0
Liabilities |  |
Payables to broker-dealers and clearing organizations | 0 | 0
Significant Unobservable Inputs (Level 3) | Payables linked to broker dealers and clearing organizations |  |
Liabilities |  |
Payables to broker-dealers and clearing organizations | $ 0 | $ 0

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