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Fair value measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
ASSETS |  |
Deposits with clearing organizations | $ 27,683 | $ 28,071
Securities owned: |  |
Securities owned, at fair value | 1,256,970 | 1,108,206
Investments | 17,771 | 17,983
Trade claim |  | 2,684
Loans | 830 | 432
Total | 1,303,354 | 1,157,376
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 203,341 | 98,892
Derivative contracts: |  |
Derivative contracts, total | 940 | 1,071
Total | 204,281 | 99,963
Derivative contracts, total | 100 |
U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 1,053,781 | 995,420
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 152,538 | 82,767
U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 3,408 | 3,691
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1 | 4
Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 1,230 |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 9,159 |
Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 36,956 | 9,423
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 14,779 | 11
Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 7,933 | 8,954
Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 92,617 | 34,704
Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 23,135 | 21,938
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 16,194 | 4,998
Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 30,844 | 23,873
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 10,670 | 11,112
Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 6,938 | 7,551
Auction rate securities |  |
Securities owned: |  |
Securities owned, at fair value | 128 | 2,652
Future |  |
Derivative contracts: |  |
Derivative contracts, total | 846 | 1,071
TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 94 |
Derivative contracts, total | 100 |
Level 1 |  |
ASSETS |  |
Deposits with clearing organizations | 27,683 | 28,071
Securities owned: |  |
Securities owned, at fair value | 1,089,935 | 1,026,844
Investments | 0 | 978
Trade claim |  | 0
Loans | 0 | 0
Total | 1,117,618 | 1,055,893
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 163,208 | 93,879
Derivative contracts: |  |
Derivative contracts, total | 846 | 1,071
Total | 164,054 | 94,950
Derivative contracts, total | 0 |
Level 1 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 1,053,781 | 995,420
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 152,538 | 82,767
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 |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 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 | 29,654 | 23,873
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 10,670 | 11,112
Level 1 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 6,500 | 7,551
Level 1 | Auction rate securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 1 | Future |  |
Derivative contracts: |  |
Derivative contracts, total | 846 | 1,071
Level 1 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 0 |
Derivative contracts, total | 0 |
Level 2 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 163,855 | 78,710
Investments | 17,771 | 17,005
Trade claim |  | 0
Loans | 830 | 432
Total | 182,556 | 96,147
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 40,133 | 5,013
Derivative contracts: |  |
Derivative contracts, total | 94 | 0
Total | 40,227 | 5,013
Derivative contracts, total | 100 |
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 | 3,408 | 3,691
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1 | 4
Level 2 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 1,230 |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 9,159 |
Level 2 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 35,094 | 9,423
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 14,779 | 11
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 7,933 | 8,954
Level 2 | Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 92,617 | 34,704
Level 2 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 23,135 | 21,938
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 16,194 | 4,998
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 | 438 | 0
Level 2 | Auction rate securities |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 0
Level 2 | Future |  |
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Level 2 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 94 |
Derivative contracts, total | 100 |
Level 3 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 3,180 | 2,652
Investments | 0 | 0
Trade claim |  | 2,684
Loans | 0 | 0
Total | 3,180 | 5,336
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
Derivative contracts, total | 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 |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 |
Level 3 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 1,862 | 0
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 | 1,190 | 0
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 | Auction rate securities |  |
Securities owned: |  |
Securities owned, at fair value | 128 | 2,652
Level 3 | Future |  |
Derivative contracts: |  |
Derivative contracts, total | 0 | $ 0
Level 3 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 0 |
Derivative contracts, total | $ 0 |

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