Diamond Hill(DHIL) - 2025 Q4 - Annual Results

Exhibit 99.1 FOR IMMEDIATE RELEASE: Investor Contact: Tom Line—Chief Financial Officer 614-255-5989 (tline@diamond-hill.com) DIAMOND HILL INVESTMENT GROUP, INC. REPORTS 2025 FINANCIAL RESULTS COLUMBUS, Ohio - February 26, 2026 -- Diamond Hill Investment Group, Inc. (Nasdaq: DHIL) today reported financial results for the fourth quarter and year ended December 31, 2025. • Assets under management ("AUM") and assets under advisement ("AUA") combined were $31.0 billion, compared to $31.9 billion as of December 3 ...