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Business Segment and Geographic Information - Revenue by Client Sector (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Business Segment and Geographic Information |  |  |  |
Total revenue | $ 297,138 | $ 260,840 | $ 608,624 | $ 534,239
Operating expenses | 190,531 | 177,048 | 390,415 | 352,120
Operating income | 106,607 | 83,792 | 218,209 | 182,119
Institutional |  |  |  |
Business Segment and Geographic Information |  |  |  |
Total revenue | 181,298 | 160,883 | 378,508 | 336,207
Wholesale |  |  |  |
Business Segment and Geographic Information |  |  |  |
Total revenue | 68,010 | 61,689 | 140,948 | 121,079
Retail |  |  |  |
Business Segment and Geographic Information |  |  |  |
Total revenue | 26,800 | 18,261 | 46,772 | 36,974
Market Data |  |  |  |
Business Segment and Geographic Information |  |  |  |
Total revenue | $ 21,030 | $ 20,007 | $ 42,396 | $ 39,979

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