Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP INC. (Exact name of registrant as specified in its charter) | --- | --- | | ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP INC. (Exact name of registrant as specified in its charter) Ohio 65-019040 ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP, INC. (Exact name of registrant as specified in its charter) Ohio 65-0190407 (S ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP INC. (Exact name of registrant as specified in its charter) | --- | |- ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP INC. (Exact name of registrant as specified in its charter) | --- | |------ ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP, INC. (Exact name of registrant as specified in its charter) | --- | |--------------------------------------------------------------------------------------------------------------------------------| | | | Ohio | | ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 Commission file number 000-24498 DIAMOND HILL INVESTMENT GROUP, INC. (Exact name of registrant as specified in its charter) Ohio 65-0190407 (State of incorporation) (I.R.S. Employer Identification No.) 325 John H. McConnell Blvd., Suite 200, Columbus, Ohio 43215 43215 (Address of pr ...