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Business and Organization
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Business and Organization

Note 1 Business and Organization

Diamond Hill Investment Group, Inc., an Ohio corporation (“DHIL” and, collectively with its subsidiaries, the “Company”), derives its consolidated revenues and net income from investment advisory and fund administration services provided by its wholly-owned subsidiary, Diamond Hill Capital Management, Inc., an Ohio corporation (“DHCM”).

DHCM is a registered investment adviser. DHCM is the investment adviser and administrator for the Diamond Hill Funds, a series of funds (each a “Diamond Hill Fund”, and collectively, the “Diamond Hill Funds”), including open-end mutual funds and the Diamond Hill Large Cap Concentrated ETF, an exchange-traded fund (“ETF”), the Diamond Hill Securitized Credit Fund, a closed-end registered investment company (“DHSC,” and together with the Diamond Hill Funds, the “Proprietary Funds”). DHCM also provides investment advisory and related services to the Diamond Hill Micro Cap Fund, LP (“DHMF”), a private fund, as well as separately managed accounts (“SMAs”), collective investment trusts (“CITs”), other pooled vehicles including sub-advised funds, and model delivery programs.