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Fair value measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
ASSETS |  |
Deposits with clearing organizations | $ 35,480 | $ 34,789
Securities owned: |  |
Securities owned, at fair value | 1,067,452 | 795,312
Investments | 18,880 | 18,785
Trade claim | 1,257 |
Loans | 677 |
Securities purchased under agreements to resell | 0 | 5,842
Derivative contracts: |  |
Derivative contracts, total | 38 | 13
Total | 1,123,784 | 854,741
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 203,663 | 31,676
Derivative contracts: |  |
Derivative contracts, total | 4,978 | 737
Total | 208,641 | 32,413
Sovereign obligations |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1,678 |
U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 940,816 | 695,346
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 166,160 | 14,603
U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 4,602 | 2
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1 |
Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 5,390 |
Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 15,040 | 5,769
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 5,406 | 1,508
Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,204 | 6,627
Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 37,592 | 35,333
Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 22,907 | 16,735
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 15,767 | 2,136
Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 29,375 | 27,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 14,651 | 13,427
Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 6,845 | 5,617
Auction rate securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,681 | 2,713
Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 2
Derivative contracts: |  |
Derivative contracts, total | 4,936 | 735
TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 38 | 11
Derivative contracts: |  |
Derivative contracts, total | 42 | 2
Mortgage and other asset-backed securities |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value |  | 2
Level 1 |  |
ASSETS |  |
Deposits with clearing organizations | 35,480 | 34,789
Securities owned: |  |
Securities owned, at fair value | 975,985 | 727,916
Investments | 1,244 | 1,872
Trade claim | 0 |
Loans | 0 |
Securities purchased under agreements to resell |  | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 2
Total | 1,012,709 | 764,579
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 180,811 | 28,030
Derivative contracts: |  |
Derivative contracts, total | 4,936 | 735
Total | 185,747 | 28,765
Level 1 | Sovereign obligations |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 0 |
Level 1 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 940,816 | 695,346
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 166,160 | 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 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, 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 | 29,375 | 27,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 14,651 | 13,427
Level 1 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 5,794 | 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, total | 4,936 | 735
Level 1 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Level 1 | Mortgage and other asset-backed securities |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value |  | 0
Level 2 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 88,786 | 64,683
Investments | 17,636 | 16,913
Trade claim | 1,257 |
Loans | 677 |
Securities purchased under agreements to resell |  | 5,842
Derivative contracts: |  |
Derivative contracts, total | 38 | 11
Total | 108,394 | 87,449
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 22,852 | 3,646
Derivative contracts: |  |
Derivative contracts, total | 42 | 2
Total | 22,894 | 3,648
Level 2 | Sovereign obligations |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1,678 |
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 | 4,602 | 2
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1 |
Level 2 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 5,390 |
Level 2 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 15,040 | 5,769
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 5,406 | 1,508
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,204 | 6,627
Level 2 | Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 37,592 | 35,333
Level 2 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 22,907 | 16,735
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 15,767 | 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 | 1,051 | 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, total | 0 | 0
Level 2 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 38 | 11
Derivative contracts: |  |
Derivative contracts, total | 42 | 2
Level 2 | Mortgage and other asset-backed securities |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value |  | 2
Level 3 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 2,681 | 2,713
Investments | 0 | 0
Trade claim | 0 |
Loans | 0 |
Securities purchased under agreements to resell |  | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Total | 2,681 | 2,713
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 | Sovereign obligations |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 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 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, 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
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 | 2,681 | 2,713
Level 3 | Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Level 3 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Derivative contracts: |  |
Derivative contracts, total | $ 0 | 0
Level 3 | Mortgage and other asset-backed securities |  |
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value |  | $ 0

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