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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Investments, All Other Investments [Abstract] |  |
Investments at fair value | $ 305,473 | $ 267,599
Investments accounted for under the equity method | 17,045 | 14,363
Total investments | 322,518 | 281,962
Less: Investments attributable to noncontrolling interests | (216,838) | (187,624)
Total investments attributable to Piper Sandler Companies | $ 105,680 | $ 94,338

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