COLUMBUS, Ohio, July 29, 2025 /PRNewswire/ -- Diamond Hill Investment Group, Inc. (Nasdaq: DHIL) today reported unaudited financial results for the second quarter of 2025.The following are selected highlights for the quarter ended June 30, 2025: Assets under management ("AUM") and assets under advisement ("AUA") combined were $31.9 billion, compared to$31.9 billion as of December 31, 2024, and $31.1 billion as of June 30, 2024. Average AUM and AUA combined were$31.0 billion, compared to $31.1 billion for ...