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Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
ASSETS |  |
Deposits with clearing organizations | $ 28,071 | $ 34,789
Securities owned |  |
Securities owned, at fair value | 1,108,206 | 795,312
Investments | 17,983 | 18,785
Trade claims | 2,684 |
Loans | 432 |
Securities purchased under agreements to resell | 0 | 5,842
Derivative contracts: |  |
Derivative contracts, total |  | 13
Total | 1,157,376 | 854,741
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 98,892 | 31,676
Derivative contracts: |  |
Derivative contracts | $ 1,071 | 737
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Receivable from brokers, dealers and clearing organizations |
Total | $ 99,963 | 32,413
U.S. Treasury securities |  |
Securities owned |  |
Securities owned, at fair value | 995,420 | 695,346
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 82,767 | 14,603
U.S. Agency securities |  |
Securities owned |  |
Securities owned, at fair value | 3,691 | 2
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 4 |
Corporate debt and other obligations |  |
Securities owned |  |
Securities owned, at fair value | 9,423 | 5,769
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 11 | 1,508
Mortgage and other asset-backed securities |  |
Securities owned |  |
Securities owned, at fair value | 8,954 | 6,627
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 2
Municipal obligations |  |
Securities owned |  |
Securities owned, at fair value | 34,704 | 35,333
Convertible bonds |  |
Securities owned |  |
Securities owned, at fair value | 21,938 | 16,735
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 4,998 | 2,136
Corporate equities |  |
Securities owned |  |
Securities owned, at fair value | 23,873 | 27,170
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 11,112 | 13,427
Money markets |  |
Securities owned |  |
Securities owned, at fair value | 7,551 | 5,617
Auction rate securities |  |
Securities owned |  |
Securities owned, at fair value | 2,652 | 2,713
Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 2
Derivative contracts: |  |
Derivative contracts | 1,071 | 735
TBAs |  |
Derivative contracts: |  |
Derivative contracts, total |  | 11
Derivative contracts: |  |
Derivative contracts |  | 2
Level 1 |  |
ASSETS |  |
Deposits with clearing organizations | 28,071 | 34,789
Securities owned |  |
Securities owned, at fair value | 1,026,844 | 727,916
Investments | 978 | 1,872
Trade claims |  |
Loans |  |
Securities purchased under agreements to resell |  | 0
Derivative contracts: |  |
Derivative contracts, total |  | 2
Total | 1,055,893 | 764,579
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 93,879 | 28,030
Derivative contracts: |  |
Derivative contracts | 1,071 | 735
Total | 94,950 | 28,765
Level 1 | U.S. Treasury securities |  |
Securities owned |  |
Securities owned, at fair value | 995,420 | 695,346
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 82,767 | 14,603
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 |
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
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 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 | 23,873 | 27,170
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 11,112 | 13,427
Level 1 | Money markets |  |
Securities owned |  |
Securities owned, at fair value | 7,551 | 5,400
Level 1 | Auction rate securities |  |
Securities owned |  |
Securities owned, at fair value | 0 | 0
Level 1 | Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 2
Derivative contracts: |  |
Derivative contracts | 1,071 | 735
Level 1 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total |  | 0
Derivative contracts: |  |
Derivative contracts |  | 0
Level 2 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned |  |
Securities owned, at fair value | 78,710 | 64,683
Investments | 17,005 | 16,913
Trade claims |  |
Loans | 432 |
Securities purchased under agreements to resell |  | 5,842
Derivative contracts: |  |
Derivative contracts, total |  | 11
Total | 96,147 | 87,449
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 5,013 | 3,646
Derivative contracts: |  |
Derivative contracts | 0 | 2
Total | 5,013 | 3,648
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 | 3,691 | 2
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 4 |
Level 2 | Corporate debt and other obligations |  |
Securities owned |  |
Securities owned, at fair value | 9,423 | 5,769
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 11 | 1,508
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned |  |
Securities owned, at fair value | 8,954 | 6,627
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 2
Level 2 | Municipal obligations |  |
Securities owned |  |
Securities owned, at fair value | 34,704 | 35,333
Level 2 | Convertible bonds |  |
Securities owned |  |
Securities owned, at fair value | 21,938 | 16,735
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 4,998 | 2,136
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 | 0 | 217
Level 2 | Auction rate securities |  |
Securities owned |  |
Securities owned, at fair value | 0 | 0
Level 2 | Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 0
Derivative contracts: |  |
Derivative contracts | 0 | 0
Level 2 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total |  | 11
Derivative contracts: |  |
Derivative contracts |  | 2
Level 3 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned |  |
Securities owned, at fair value | 2,652 | 2,713
Investments | 0 | 0
Trade claims | 2,684 |
Loans |  |
Securities purchased under agreements to resell |  |
Derivative contracts: |  |
Derivative contracts, total |  | 0
Total | 5,336 | 2,713
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 0 | 0
Derivative contracts: |  |
Derivative contracts | 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 |
Level 3 | 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 3 | Mortgage and other asset-backed 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
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 | 0 | 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 | 2,652 | 2,713
Level 3 | Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 0
Derivative contracts: |  |
Derivative contracts | $ 0 | 0
Level 3 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total |  | 0
Derivative contracts: |  |
Derivative contracts |  | $ 0

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