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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2025

Fair Value Disclosures [Abstract]

Schedule of Fair Value Of Certain Financial Assets And Liabilities

The fair value of certain financial assets and liabilities of the Company and consolidated VIEs was determined using the following inputs:

						At September 30, 2025
						Level 1						Level 2						Level 3						NAV as a Practical Expedient						Total
Financial Assets
SEI Investments Company
Equity securities						$	53,494					$	—					$	—					$	—					$	53,494
Available-for-sale debt securities						—						167,821						—						—						167,821
Securities owned						—						31,242						—						—						31,242
Investment funds sponsored by LSV						—						—						—						10,522						10,522
Investments in limited partnership funds						—						—						—						865						865
Total financial assets of SEI Investments Company						53,494						199,063						—						11,387						263,944
Consolidated VIEs
Equity securities						106,044						—						—						—						106,044
Total financial assets of consolidated VIEs						106,044						—						—						—						106,044
Total financial assets measured at fair value						$	159,538					$	199,063					$	—					$	11,387					$	369,988
Financial Liabilities
SEI Investments Company
Contingent considerations						$	—					$	—					$	9,252					$	—					$	9,252
Total financial liabilities of SEI Investments Company						—						—						9,252						—						9,252
Consolidated VIEs
Securities sold short						100,466						—						—						—						100,466
Total financial liabilities of consolidated VIEs						100,466						—						—						—						100,466
Total financial liabilities measured at fair value						$	100,466					$	—					$	9,252					$	—					$	109,718

						At December 31, 2024
						Level 1						Level 2						Level 3						NAV as a Practical Expedient						Total
Financial Assets
SEI Investments Company
Equity securities						$	40,530					$	—					$	—					$	—					$	40,530
Available-for-sale debt securities						—						143,126						—						—						143,126
Securities owned						—						29,583						—						—						29,583
Investment funds sponsored by LSV						—						—						—						8,129						8,129
Total financial assets measured at fair value						$	40,530					$	172,709					$	—					$	8,129					$	221,368
Financial Liabilities
SEI Investments Company
Contingent considerations						$	—					$	—					$	14,355					$	—					$	14,355
Total financial liabilities measured at fair value						$	—					$	—					$	14,355					$	—					$	14,355

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- References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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