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Fair value measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Assets |  |
Deposits with clearing organizations | $ 28,237 | $ 27,996
Securities owned: |  |
Securities owned, at fair value | 1,265,918 | 1,250,802
Investments | 29,099 | 32,295
Loans | 296 | 653
Derivative contracts |  |
Derivative contracts, total | 98 | 34
Total | 1,323,648 | 1,311,780
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 231,804 | 175,712
Derivative contracts |  |
Derivative contracts, total | 3,904 | 160
Total | 235,708 | 175,872
U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 1,160,684 | 1,151,564
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 209,798 | 155,518
U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 5,878 | 5,925
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 2 | 1
Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 5,316 | 1,223
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 997 | 2,410
Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 10,143 | 6,053
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1,275 | 1,965
Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,140 | 2,109
Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 28,350 | 28,926
Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 17,826 | 20,500
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 10,652 | 6,096
Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 30,223 | 29,370
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 9,080 | 9,722
Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 5,230 | 5,004
Other debt securities |  |
Securities owned: |  |
Securities owned, at fair value | 128 | 128
Futures |  |
Derivative contracts |  |
Derivative contracts, total | 3,812 | 133
TBAs |  |
Derivative contracts |  |
Derivative contracts, total | 98 | 34
Derivative contracts |  |
Derivative contracts, total | 92 | 27
Level 1 |  |
Assets |  |
Deposits with clearing organizations | 28,237 | 27,996
Securities owned: |  |
Securities owned, at fair value | 1,194,737 | 1,184,764
Investments | 1,600 | 1,600
Loans | 0 | 0
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Total | 1,224,574 | 1,214,360
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 218,878 | 165,240
Derivative contracts |  |
Derivative contracts, total | 3,812 | 133
Total | 222,690 | 165,373
Level 1 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 1,160,684 | 1,151,564
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 209,798 | 155,518
Level 1 | U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 1 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 1 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 1 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 1 | Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 1 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 1 | Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 29,053 | 28,200
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 9,080 | 9,722
Level 1 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 5,000 | 5,000
Level 1 | Other debt securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 1 | Futures |  |
Derivative contracts |  |
Derivative contracts, total | 3,812 | 133
Level 1 | TBAs |  |
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Level 2 |  |
Assets |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 67,730 | 62,676
Investments | 10,499 | 13,695
Loans | 296 | 653
Derivative contracts |  |
Derivative contracts, total | 98 | 34
Total | 78,623 | 77,058
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 12,926 | 10,472
Derivative contracts |  |
Derivative contracts, total | 92 | 27
Total | 13,018 | 10,499
Level 2 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 2 | U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 5,878 | 5,925
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 2 | 1
Level 2 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 5,316 | 1,223
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 997 | 2,410
Level 2 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 7,990 | 3,989
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1,275 | 1,965
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,140 | 2,109
Level 2 | Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 28,350 | 28,926
Level 2 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 17,826 | 20,500
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 10,652 | 6,096
Level 2 | Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 2 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 230 | 4
Level 2 | Other debt securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 2 | Futures |  |
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Level 2 | TBAs |  |
Derivative contracts |  |
Derivative contracts, total | 98 | 34
Derivative contracts |  |
Derivative contracts, total | 92 | 27
Level 3 |  |
Assets |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 3,451 | 3,362
Investments | 17,000 | 17,000
Loans | 0 | 0
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Total | 20,451 | 20,362
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Total | 0 | 0
Level 3 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 3 | U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 3 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 3 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 2,153 | 2,064
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 3 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 3 | Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 3 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 3 | Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 1,170 | 1,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Level 3 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 3 | Other debt securities |  |
Securities owned: |  |
Securities owned, at fair value | 128 | 128
Level 3 | Futures |  |
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Level 3 | TBAs |  |
Derivative contracts |  |
Derivative contracts, total | 0 | 0
Derivative contracts |  |
Derivative contracts, total | $ 0 | $ 0

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