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 ...