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Investment Securities (Tables) | 9 Months Ended
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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, 2025 |  | As of December 31, 2024
Seed investments in equity securities | $ | 70,078 |  |  | $ | 66,349 |
Seed investments in equity securities accounted for under the equity method | 2,119 |  |  | 7,964 |
Compensation plan investments in equity securities | 167,055 |  |  | 127,430 |
Compensation plan investments in equity securities accounted for under the equity method | 18,157 |  |  | 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,
| 2025 |  | 2024 |  | 2025 |  | 2024
Unrealized gain (loss) on investment securities held at the end of the period | $ | 9,109 |  |  | $ | 10,697 |  |  | $ | 28,184 |  |  | $ | 20,198 |

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