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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
The disclosures below detail Artisan’s investments, excluding money market funds and consolidated investment products. Investments held by consolidated investment products are described in Note 6, “Variable Interest Entities and Consolidated Investment Products.”
As of September 30, 2025As of December 31, 2024
Seed investments in equity securities$70,078 $66,349 
Seed investments in equity securities accounted for under the equity method2,119 7,964 
Compensation plan investments in equity securities167,055 127,430 
Compensation plan investments in equity securities accounted for under the equity method18,157 7,049 
Total investment securities$257,409 $208,792 
Unrealized Gain (Loss) on Investments
Unrealized gain (loss) related to investment securities held on the dates indicated below were as follows:
For the Three Months Ended September 30,
 For the Nine Months Ended September 30,
2025202420252024
Unrealized gain (loss) on investment securities held at the end of the period$9,109 $10,697 $28,184 $20,198