DIAMOND HILL INVESTMENT GROUP INC

Regulatory Filings • Oct 2, 2025

United States

Securities and Exchange Commission

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): 10/2/2025

DIAMOND HILL INVESTMENT GROUP, INC.

(Exact name of registrant as specified in its charter)

Ohio	000-24498	65-0190407
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

325 John H. McConnell Blvd, Suite 200, Columbus , Ohio 43215

(Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: ( 614 ) 255-3333

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, no par value	DHIL	The Nasdaq Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events

The following is a summary of assets under management as of September 30, 2025 of Diamond Hill Capital Management, Inc., a wholly owned subsidiary of Diamond Hill Investment Group, Inc. (in millions):

By Investment Vehicle
Proprietary Funds	$ 19,588
Separately managed accounts	5,437
Collective investment trusts	1,686
Other pooled vehicles	3,872
Total	$ 30,583
By Investment Strategy
Small Cap	$ 245
Small-Mid Cap	1,435
Mid Cap	882
Large Cap	16,175
Large Cap Concentrated	162
Select	780
Long-Short	2,111
International	164
Micro Cap	43
Short Duration Securitized Bond	4,865
Securitized Credit	121
Securitized Total Return	31
Core Fixed Income	3,543
Long Duration Treasury	26
Total	$ 30,583

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

/s/ Thomas E. Line
Thomas E. Line, Chief Financial Officer and Treasurer