Diamond Hill Investment Group, Inc., through its subsidiary, Diamond Hill Capital Management, Inc., provides investment advisory and fund administration services in the United States.

It sponsors, distributes, and offers investment advisory and related services to its clients through pooled investment vehicles, including the Diamond Hill Funds, separately managed accounts, and model delivery programs.

The company also provides fund administration services, including portfolio and regulatory compliance, treasury and financial oversight, and general business management and governance of the mutual fund complex, as well as oversight of back-office service providers, such as the custodian, fund accountant, and transfer agent.

The company was founded in 1990 and is based in Columbus, Ohio.