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NET INTEREST INCOME/EXPENSE (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Interest income: |  |  |  |
Interest income on margin loans to customers | $ 72,814 | $ 40,917 | $ 133,103 | $ 91,984
Interest income on loans to customers | 66,678 | 49,393 | 128,372 | 101,760
Interest income on trading securities | 37,669 | 104,992 | 90,245 | 212,120
Interest income on held-to-maturity securities | 15,356 | 0 | 20,529 | 0
Interest income on securities available-for-sale | 13,874 | 9,003 | 27,257 | 17,403
Interest income on reverse repurchase agreements and amounts due from banks | 5,271 | 6,019 | 10,727 | 13,061
Total interest income | 211,662 | 210,324 | 410,233 | 436,328
Interest expense: |  |  |  |
Interest expense on customer accounts and deposits | 43,024 | 23,696 | 82,356 | 46,823
Interest expense on securities repurchase agreement obligations | 34,051 | 86,116 | 79,512 | 178,523
Interest expense on debt securities issued | 17,500 | 6,969 | 31,251 | 13,938
Interest expense on margin lending payable | 5,598 | 7,416 | 18,972 | 30,539
Interest expense on loans received | 575 | 468 | 1,085 | 512
Other interest expense | 1,511 | 0 | 2,493 | 48
Total interest expense | 102,259 | 124,665 | 215,669 | 270,383
Net interest income | $ 109,403 | $ 85,659 | $ 194,564 | $ 165,945

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