CERTIFICATION PURSUANT TO

TITLE 18, UNITED STATES CODE, SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Diamond Hill Investment Group, Inc. (the “Company”) on Form 10-Q for the quarterly period ended March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Heather E. Brilliant, Chief Executive Officer of the Company, and Thomas E. Line, Chief Financial Officer of the Company, certify, pursuant to Title 18, United States Code, Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Heather E. Brilliant

Print Name: Heather E. Brilliant

Title: Chief Executive Officer

Date: April 26, 2021

/s/ Thomas E. Line

Print Name: Thomas E. Line

Title: Chief Financial Officer

Date: April 26, 2021