# EDGAR Filing Document

**Accession Number:** 0000909108
**File Stem:** 0001193125-26-100076
**Filing Date:** 2026-3
**Character Count:** 8797
**Document Hash:** 5fb400f3937423122b1bfd36f5dcbc77
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-100076.hdr.sgml**: 20260310

**ACCESSION NUMBER**: 0001193125-26-100076

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20231208

**FILED AS OF DATE**: 20260310

**DATE AS OF CHANGE**: 20260310

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Thomas L'Quentus
- **CENTRAL INDEX KEY:** 0001889219

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-24498
- **FILM NUMBER:** 26738986

**MAIL ADDRESS:**
- **STREET 1:** 325 JOHN H MCCONNELL BLVD
- **STREET 2:** SUITE 200
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DIAMOND HILL INVESTMENT GROUP INC
- **CENTRAL INDEX KEY:** 0000909108
- **STANDARD INDUSTRIAL CLASSIFICATION:** INVESTMENT ADVICE [6282]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 650190407
- **STATE OF INCORPORATION:** OH
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 325 JOHN H MCCONNELL BLVD
- **STREET 2:** SUITE 200
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215
- **BUSINESS PHONE:** 6142553333

**MAIL ADDRESS:**
- **STREET 1:** 325 JOHN H MCCONNELL BLVD
- **STREET 2:** SUITE 200
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BANC STOCK GROUP INC
- **DATE OF NAME CHANGE:** 19971016

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** HEARTLAND GROUP OF COMPANIES INC
- **DATE OF NAME CHANGE:** 19940301

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** HEARTLAND FINANCIAL GROUP INC
- **DATE OF NAME CHANGE:** 19930714

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Thomas L'Quentus<br><sub>(Last) (First) (Middle)</sub><br>325 JOHN H MCCONNELL BLVD<br>SUITE 200<br><sub>(Street)</sub><br>COLUMBUS, OH 43215<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-12-08 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>DIAMOND HILL INVESTMENT GROUP INC [ DHIL ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Shares | 2024-06-14 |  | P<sup>(1)</sup> |  | 6.731 | A | $149.44 | 2540.731 | D |  |
| Common Shares | 2024-09-13 |  | P<sup>(2)</sup> |  | 13.827 | A | $152.34 | 2554.558 | D |  |
| Common Shares | 2024-12-06 |  | P<sup>(3)</sup> |  | 10.615 | A | $165.07 | 2565.173 | D |  |
| Common Shares | 2025-03-21 |  | P<sup>(3)</sup> |  | 12.069 | A | $146.50 | 2577.242 | D |  |
| Common Shares | 2025-06-13 |  | P<sup>(4)</sup> |  | 12.191 | A | $146.51 | 2589.433 | D |  |
| Common Shares | 2025-09-12 |  | P<sup>(4)</sup> |  | 12.618 | A | $143.00 | 2602.051 | D |  |
| Common Shares | 2024-03-22 |  | P<sup>(5)</sup> |  | 6.558 | A | $151.87 | 2608.609 | D |  |
| Common Shares | 2023-12-08 |  | P<sup>(5)</sup> |  | 5.925 | A | $166.59 | 2614.534 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Inadvertent purchase of the issuer's common shares through a broker-administered dividend reinvestment plan.  The reporting person sold 250 common shares at $161.64 per share on September 23, 2024, which was reported on Form 4 filed on September 24, 2024 (the "2024 Sale").  This purchase and the 2024 Sale were matchable under Section 16(b) of the Securities Exchange Act of 1934, and resulted in a short swing profit of $82.12, which was disgorged in full to the issuer by the reporting person.

(2) Inadvertent purchase of the issuer's common shares through a broker-administered dividend reinvestment plan.  This purchase and the 2024 Sale were matchable under Section 16(b) of the Securities Exchange Act of 1934, and resulted in a short swing profit of $128.59, which was disgorged in full to the issuer by the reporting person.

(3) Inadvertent purchase of the issuer's common shares through a broker-administered dividend reinvestment plan.  Although this purchase was matchable against the 2024 Sale under Section 16(b) of the Securities Exchange Act of 1934, no profit was realized by the reporting person.

(4) Inadvertent purchase of the issuer's common shares through a broker-administered dividend reinvestment plan.  The reporting person sold 250 common shares at $141.10 per share on September 23, 2025, which was reported on Form 4 filed on September 25, 2025 (the "2025 Sale").  Although this purchase was matchable against the 2024 Sale under Section 16(b) of the Securities Exchange Act of 1934, no profit was realized by the reporting person.

(5) Inadvertent purchase of the issuer's common shares through a broker-administered dividend reinvestment plan.

**Remarks:**
The Amount of Securities Beneficially Owned Following the Reported Transaction (Table I, Column 5) in Mr. Thomas' most recent Form 4 (filed on September 25, 2025) was 2,534 common shares.  When reporting delinquent transactions, the tally should be based on (i.e., should reflect adjustments to) the number of shares reported as beneficially owned in the insider's last filed report, and should not attempt to show the number of shares owned as of the date of each transaction being reported late (if different).

**Signature:** Carlotta D. King by POA  
**Date:** 2026-03-10

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**