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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, 2024 | Dec. 31, 2023
--- | --- | ---
ASSETS |  |
Deposits with clearing organizations | $ 34,967 | $ 34,789
Securities owned: |  |
Securities owned, at fair value | 1,043,256 | 795,312
Investments | 18,656 | 18,785
Loans | 689 |
Securities purchased under agreements to resell | 4,079 | 5,842
Derivative contracts: |  |
Derivative contracts, total | 29 | 13
Total | 1,097,597 | 854,741
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 177,251 | 31,676
Derivative contracts: |  |
Derivative contracts, total | 1,456 | 737
Total | 178,707 | 32,413
U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 859,623 | 695,346
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 138,059 | 14,603
U.S. Agency securities |  |
Securities owned: |  |
Securities owned, at fair value | 5,755 | 2
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 2 |
Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 424 |
Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 18,104 | 5,769
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 7,279 | 1,508
Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 7,117 | 6,627
Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 88,373 | 35,333
Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 25,272 | 16,735
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 13,450 | 2,136
Corporate equities |  |
Securities owned: |  |
Securities owned, at fair value | 29,622 | 27,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 18,461 | 13,427
Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 6,253 | 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, total | 1,423 | 735
TBAs |  |
Derivative contracts: |  |
Derivative contracts, total | 29 | 11
Derivative contracts: |  |
Derivative contracts, total | 33 | 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 | 34,967 | 34,789
Securities owned: |  |
Securities owned, at fair value | 894,995 | 727,916
Investments | 1,369 | 1,872
Loans | 0 |
Securities purchased under agreements to resell |  | 0
Derivative contracts: |  |
Derivative contracts, total | 0 | 2
Total | 931,331 | 764,579
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 156,520 | 28,030
Derivative contracts: |  |
Derivative contracts, total | 1,423 | 735
Total | 157,943 | 28,765
Level 1 | U.S. Treasury securities |  |
Securities owned: |  |
Securities owned, at fair value | 859,623 | 695,346
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 138,059 | 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 | 29,622 | 27,170
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 18,461 | 13,427
Level 1 | Money markets |  |
Securities owned: |  |
Securities owned, at fair value | 5,750 | 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 | 1,423 | 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 | 145,548 | 64,683
Investments | 17,287 | 16,913
Loans | 689 |
Securities purchased under agreements to resell |  | 5,842
Derivative contracts: |  |
Derivative contracts, total | 29 | 11
Total | 163,553 | 87,449
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 20,731 | 3,646
Derivative contracts: |  |
Derivative contracts, total | 33 | 2
Total | 20,764 | 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 | 5,755 | 2
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 2 |
Level 2 | Sovereign obligations |  |
Securities owned: |  |
Securities owned, at fair value | 424 |
Level 2 | Corporate debt and other obligations |  |
Securities owned: |  |
Securities owned, at fair value | 18,104 | 5,769
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 7,279 | 1,508
Level 2 | Mortgage and other asset-backed securities |  |
Securities owned: |  |
Securities owned, at fair value | 7,117 | 6,627
Level 2 | Municipal obligations |  |
Securities owned: |  |
Securities owned, at fair value | 88,373 | 35,333
Level 2 | Convertible bonds |  |
Securities owned: |  |
Securities owned, at fair value | 25,272 | 16,735
Securities sold but not yet purchased: |  |
Securities sold but not yet purchased, at fair value | 13,450 | 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 | 503 | 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 | 29 | 11
Derivative contracts: |  |
Derivative contracts, total | 33 | 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 | 2,713 | 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, total | 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 |
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 | 2,713 | 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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