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Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
ASSETS |  |
Deposits with clearing organizations | $ 35,225 | $ 34,789
Securities owned: |  |
Securities owned, at fair value | 1,044,089 | 795,312
Investments | 18,160 | 18,785
Loans | 2,485 |
Securities purchased under agreements to resell | 4,090 | 5,842
Derivative contracts: |  |
Derivative contracts, total | 185 | 13
Total | 1,100,144 | 854,741
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 520,932 | 31,676
Derivative contracts: |  |
Derivative contracts | 1,891 | 737
Total | 522,823 | 32,413
U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 927,933 | 695,346
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 488,901 | 14,603
U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 8,419 | 2
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1 |
Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 11,707 | 5,769
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 10,577 | 1,508
Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,981 | 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 | 47,374 | 35,333
Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 14,393 | 16,735
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 11,687 | 2,136
Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 28,319 | 27,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 9,766 | 13,427
Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 250 | 5,617
Auction rate securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,713 | 2,713
Futures |  |
Derivative contracts: |  |
Derivative contracts, total |  | 2
Derivative contracts: |  |
Derivative contracts | 1,714 | 735
TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 185 | 11
Derivative contracts: |  |
Derivative contracts | 177 | 2
Level 1 |  |
ASSETS |  |
Deposits with clearing organizations | 35,225 | 34,789
Securities owned: |  |
Securities owned, at fair value | 956,252 | 727,916
Investments | 1,715 | 1,872
Loans | 0 |
Securities purchased under agreements to resell |  | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 2
Total | 993,192 | 764,579
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 498,667 | 28,030
Derivative contracts: |  |
Derivative contracts | 1,714 | 735
Total | 500,381 | 28,765
Level 1 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 927,933 | 695,346
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 488,901 | 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 | 28,319 | 27,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 9,766 | 13,427
Level 1 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 0 | 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 | 1,714 | 735
Level 1 | TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Derivative contracts: |  |
Derivative contracts | 0 | 0
Level 2 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 85,124 | 64,683
Investments | 16,445 | 16,913
Loans | 2,485 |
Securities purchased under agreements to resell |  | 5,842
Derivative contracts: |  |
Derivative contracts, total | 185 | 11
Total | 104,239 | 87,449
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 22,265 | 3,646
Derivative contracts: |  |
Derivative contracts | 177 | 2
Total | 22,442 | 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 | 8,419 | 2
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 1 |
Level 2 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 11,707 | 5,769
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 10,577 | 1,508
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 2,981 | 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 | 47,374 | 35,333
Level 2 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 14,393 | 16,735
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 11,687 | 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 | 250 | 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 | 185 | 11
Derivative contracts: |  |
Derivative contracts | 177 | 2
Level 3 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned: |  |
Securities owned, at fair value | 2,713 | 2,713
Investments | 0 | 0
Loans | 0 |
Securities purchased under agreements to resell |  | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 0
Total | 2,713 | 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 | 2,713 | 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 | 0
Derivative contracts: |  |
Derivative contracts | $ 0 | $ 0

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