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Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
ASSETS |  |
Deposits with clearing organizations | $ 34,789 | $ 24,937
Securities owned |  |
Securities owned, at fair value | 795,312 | 498,594
Investments | 18,785 | 7,068
Securities purchased under agreements to resell | 5,842 | 0
Derivative contracts: |  |
Derivative contracts, total | 13 |
Total | 854,741 | 532,361
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 31,676 | 52,768
Derivative contracts: |  |
Derivative contracts | 737 | 1,805
Total | 32,413 | 54,573
U.S. Treasury securities |  |
Securities owned |  |
Securities owned, at fair value | 695,346 | 362,815
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 14,603 | 25,006
U.S. Agency securities |  |
Securities owned |  |
Securities owned, at fair value | 2 | 6,012
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 3
Sovereign obligations |  |
Securities owned |  |
Securities owned, at fair value |  | 9,502
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 9,048
Corporate debt and other obligations |  |
Securities owned |  |
Securities owned, at fair value | 5,769 | 9,844
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 1,508 | 2,905
Mortgage and other asset-backed securities |  |
Securities owned |  |
Securities owned, at fair value | 6,627 | 1,882
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 | 35,333 | 30,126
Convertible bonds |  |
Securities owned |  |
Securities owned, at fair value | 16,735 | 21,800
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 2,136 | 4,428
Corporate equities |  |
Securities owned |  |
Securities owned, at fair value | 27,170 | 24,837
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 13,427 | 11,378
Money markets |  |
Securities owned |  |
Securities owned, at fair value | 5,617 |
Auction rate securities |  |
Securities owned |  |
Securities owned, at fair value | 2,713 | 31,776
Futures |  |
Derivative contracts: |  |
Derivative contracts, total | 2 |
Derivative contracts: |  |
Derivative contracts | 735 | 44
TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 11 | 1,762
Derivative contracts: |  |
Derivative contracts | 2 | 1,761
Level 1 |  |
ASSETS |  |
Deposits with clearing organizations | 34,789 | 24,937
Securities owned |  |
Securities owned, at fair value | 727,916 | 387,652
Investments | 1,872 | 0
Securities purchased under agreements to resell | 0 |
Derivative contracts: |  |
Derivative contracts, total | 2 |
Total | 764,579 | 412,589
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 28,030 | 36,384
Derivative contracts: |  |
Derivative contracts | 735 | 44
Total | 28,765 | 36,428
Level 1 | U.S. Treasury securities |  |
Securities owned |  |
Securities owned, at fair value | 695,346 | 362,815
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 14,603 | 25,006
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
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 | 27,170 | 24,837
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 13,427 | 11,378
Level 1 | Money markets |  |
Securities owned |  |
Securities owned, at fair value | 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 | 735 | 44
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 | 64,683 | 79,166
Investments | 16,913 | 7,068
Securities purchased under agreements to resell | 5,842 |
Derivative contracts: |  |
Derivative contracts, total | 11 |
Total | 87,449 | 87,996
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 3,646 | 16,384
Derivative contracts: |  |
Derivative contracts | 2 | 1,761
Total | 3,648 | 18,145
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 | 2 | 6,012
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 3
Level 2 | Sovereign obligations |  |
Securities owned |  |
Securities owned, at fair value |  | 9,502
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value |  | 9,048
Level 2 | Corporate debt and other obligations |  |
Securities owned |  |
Securities owned, at fair value | 5,769 | 9,844
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 1,508 | 2,905
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned |  |
Securities owned, at fair value | 6,627 | 1,882
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 | 35,333 | 30,126
Level 2 | Convertible bonds |  |
Securities owned |  |
Securities owned, at fair value | 16,735 | 21,800
Securities sold, but not yet purchased |  |
Securities sold but not yet purchased, at fair value | 2,136 | 4,428
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 | 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 | 1,762
Derivative contracts: |  |
Derivative contracts | 2 | 1,761
Level 3 |  |
ASSETS |  |
Deposits with clearing organizations | 0 | 0
Securities owned |  |
Securities owned, at fair value | 2,713 | 31,776
Investments | 0 | 0
Securities purchased under agreements to resell | 0 |
Derivative contracts: |  |
Derivative contracts, total | 0 |
Total | 2,713 | 31,776
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 | 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 | 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 |
Level 3 | Auction rate securities |  |
Securities owned |  |
Securities owned, at fair value | 2,713 | 31,776
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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