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United States Investment Banking & Investment Services

Diamond Hill Investment Group Inc (DHIL)

Track

The most recent insider trading activity occurred on September 23, 2025, with a SELL transaction by Thomas L'Quentus. Prior to this, on September 12, 2025, Meyer Paula R engaged in a PROPOSED_SALE, while Thomas L'Quentus made a BUY transaction. Earlier in September, Meyer Paula R also executed a SELL transaction.
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Ticker: DHIL Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Thomas L'Quentus
1 sale — total 35,275 USD
Sale 23 Sep 2025
Value US$2,185,895.22 | Price 377.55 | Shares 86,346
Buy 12 Sep 2025
Value US$2,039,175.92 | Price 431.54 | Shares 21,823
Proposed sale 12 Sep 2025
Value US$50,676.50 | Price 144.79 | Shares 350
Sale 5 Sep 2025
Value US$49,630.00 | Price 141.80 | Shares 350
Buy 13 Jun 2025
Value US$1,786.10 | Price 146.51 | Shares 12
Proposed sale 13 Jun 2025
Value US$396,000.00 | Price 144.00 | Shares 2,750
Buy 13 Jun 2025
Value US$396,027.50 | Price 144.01 | Shares 2,750
Sale 13 Jun 2025
Value US$396,000.00 | Price 144.00 | Shares 2,750
Proposed sale 16 May 2025
Value US$645,435.00 | Price 143.43 | Shares 4,500
Buy 6 May 2025
Value US$37,279.80 | Price 134.10 | Shares 278
Proposed sale 6 May 2025
Value US$1,082,000.00 | Price 135.25 | Shares 8,000
Buy 2 May 2025
Value US$15,996.00 | Price 129.00 | Shares 124
Buy 1 May 2025
Value US$88,230.00 | Price 127.50 | Shares 692
Buy 30 Apr 2025
Value US$124,500.00 | Price 124.50 | Shares 1,000
Buy 31 Mar 2025
Value US$14,250.00 | Price 142.50 | Shares 100
Buy 21 Mar 2025
Value US$1,768.11 | Price 146.50 | Shares 12
Buy 21 Mar 2025
Value US$7,175.00 | Price 143.50 | Shares 50
Buy 12 Mar 2025
Value US$72,000.00 | Price 144.00 | Shares 500
Buy 5 Mar 2025
Value US$73,000.00 | Price 146.00 | Shares 500
Buy 28 Feb 2025
Value US$39,168.00 | Price 144.00 | Shares 272
Buy 20 Dec 2024
Value US$152,250.00 | Price 152.25 | Shares 1,000
Buy 6 Dec 2024
Value US$1,752.22 | Price 165.07 | Shares 11
Sale 21 Nov 2024
Value US$1,021,560.00 | Price 170.26 | Shares 6,000
Proposed sale 18 Nov 2024
Value US$1,024,320.00 | Price 170.72 | Shares 6,000
Proposed sale 18 Nov 2024
Value US$50,754.00 | Price 169.18 | Shares 300
Sale 14 Nov 2024
Value US$50,700.00 | Price 169.00 | Shares 300
Sale 11 Nov 2024
Value US$171,070.00 | Price 171.07 | Shares 1,000
Sale 8 Nov 2024
Value US$50,100.00 | Price 167.00 | Shares 300
Proposed sale 8 Nov 2024
Value US$49,350.00 | Price 164.50 | Shares 300
Sale 6 Nov 2024
Value US$842,650.00 | Price 168.53 | Shares 5,000
Proposed sale 5 Nov 2024
Value US$944,760.00 | Price 157.46 | Shares 6,000
Proposed sale 25 Sep 2024
Value US$39,287.50 | Price 157.15 | Shares 250
Sale 23 Sep 2024
Value US$40,410.00 | Price 161.64 | Shares 250
Buy 13 Sep 2024
Value US$2,106.41 | Price 152.34 | Shares 14
Sale 8 Aug 2024
Value US$450,600.00 | Price 150.20 | Shares 3,000
Proposed sale 1 Aug 2024
Value US$470,250.00 | Price 156.75 | Shares 3,000
Buy 28 Jun 2024
Value US$42,000.00 | Price 140.00 | Shares 300
Buy 27 Jun 2024
Value US$55,696.00 | Price 139.24 | Shares 400
Buy 27 Jun 2024
Value US$34,845.00 | Price 139.38 | Shares 250
Buy 14 Jun 2024
Value US$1,005.88 | Price 149.44 | Shares 7
Buy 3 Jun 2024
Value US$75,000.00 | Price 150.00 | Shares 500
Proposed sale 17 May 2024
Value US$386,175.00 | Price 154.47 | Shares 2,500
Sale 15 May 2024
Value US$396,000.00 | Price 158.40 | Shares 2,500
Sale 15 May 2024
Value US$80,025.00 | Price 160.05 | Shares 500
Sale 14 May 2024
Value US$313,500.00 | Price 156.75 | Shares 2,000
Sale 13 May 2024
Value US$156,000.00 | Price 156.00 | Shares 1,000
Proposed sale 13 May 2024
Value US$620,280.00 | Price 155.07 | Shares 4,000
Buy 22 Mar 2024
Value US$995.96 | Price 151.87 | Shares 7
Sale 20 Dec 2023
Value US$255,540.00 | Price 170.36 | Shares 1,500
Sale 19 Dec 2023
Value US$170,000.00 | Price 170.00 | Shares 1,000
Sale 18 Dec 2023
Value US$84,750.00 | Price 169.50 | Shares 500
Proposed sale 18 Dec 2023
Value US$501,000.00 | Price 167.00 | Shares 3,000
Buy 8 Dec 2023
Value US$987.05 | Price 166.59 | Shares 6
Buy 2 Nov 2023
Value US$48,581.00 | Price 149.48 | Shares 325
Proposed sale 4 Sep 2023
Value US$87,000.00 | Price 174.00 | Shares 500
Sale 30 Aug 2023
Value US$85,655.00 | Price 171.31 | Shares 500
Proposed sale 7 Aug 2023
Value US$528,030.00 | Price 176.01 | Shares 3,000
Buy 16 Mar 2023
Value US$79,000.00 | Price 158.00 | Shares 500
Sale 14 Nov 2022
Value US$273,540.00 | Price 182.36 | Shares 1,500
Buy 29 Apr 2022
Value US$74,985.30 | Price 172.38 | Shares 435
Buy 28 Apr 2022
Value US$51,615.48 | Price 171.48 | Shares 301
Sale 1 Apr 2022
Value US$55,628.10 | Price 187.30 | Shares 297
Sale 1 Apr 2022
Value US$31,091.80 | Price 187.30 | Shares 166
Sale 2 Mar 2022
Value US$98,500.00 | Price 197.00 | Shares 500
Sale 10 May 2021
Value US$89,250.00 | Price 178.50 | Shares 500
Sale 10 May 2021
Value US$177,000.00 | Price 177.00 | Shares 1,000
Buy 31 Mar 2021
Value US$7,426.16 | Price 132.61 | Shares 56
Buy 1 Mar 2021
Value US$72,600.00 | Price 145.20 | Shares 500
Buy 26 Feb 2021
Value US$217,350.00 | Price 144.90 | Shares 1,500
Buy 26 Feb 2021
Value US$213,000.00 | Price 142.00 | Shares 1,500
Sale 10 Jun 2020
Value US$120,730.00 | Price 120.73 | Shares 1,000
Buy 13 Mar 2020
Value US$190,320.00 | Price 95.16 | Shares 2,000
Buy 13 Mar 2020
Value US$39,600.00 | Price 99.00 | Shares 400
Buy 12 Mar 2020
Value US$41,000.00 | Price 102.50 | Shares 400
Buy 5 Mar 2020
Value US$306,875.00 | Price 122.75 | Shares 2,500
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2025-09-25 2025-09-23 S Sale
3.2
Thomas L'Quentus
Non-Executive Director
86,346 +5.7%
377.55
US$2,185,895 		86,346 +5.7% 377.55 US$2,185,895
2026-03-10 2025-09-12 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
21,823 +43.1%
431.54
US$2,039,176 		21,823 +43.1% 431.54 US$2,039,176
2025-09-05 2025-09-12 PrS Proposed sale
3.6
Meyer Paula R

Director

Non-Executive Director
73,566
110.57
US$841,780 		73,566 110.57 US$841,780
2025-09-09 2025-09-05 S Sale
3.6
Meyer Paula R
Non-Executive Director
350 -8.5%
141.80
US$49,630 		350 -8.5% 141.80 US$49,630
2026-03-10 2025-06-13 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
12 +0.5%
146.51
US$1,786 		12 +0.5% 146.51 US$1,786
2025-06-17 2025-06-13 PrS Proposed sale
2.3
Quinif Jo Ann

Affiliate
2,750
144.00
US$396,000 		2,750 144.00 US$396,000
2025-06-17 2025-06-13 B Purchase
2.3
Quinif Jo Ann

President of DHCM

Officer
2,750 +11.9%
144.01
US$396,028 		2,750 +11.9% 144.01 US$396,028
2025-06-17 2025-06-13 S Sale
2.3
Quinif Jo Ann

President of DHCM

Officer
2,750 -10.7%
144.00
US$396,000 		2,750 -10.7% 144.00 US$396,000
2025-05-14 2025-05-16 PrS Proposed sale
3.5
LAIRD JAMES F JR

Former Affiliate
4,500
143.43
US$645,435 		4,500 143.43 US$645,435
2025-05-07 2025-05-06 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
278 +2.1%
134.10
US$37,280 		278 +2.1% 134.10 US$37,280
2025-05-06 2025-05-06 PrS Proposed sale
3.5
LAIRD JAMES F JR

Former Affiliate
8,000
135.25
US$1,082,000 		8,000 135.25 US$1,082,000
2025-05-06 2025-05-02 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
124 +0.9%
129.00
US$15,996 		124 +0.9% 129.00 US$15,996
2025-05-02 2025-05-01 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
692 +5.4%
127.50
US$88,230 		692 +5.4% 127.50 US$88,230
2025-05-01 2025-04-30 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
1,000 +8.5%
124.50
US$124,500 		1,000 +8.5% 124.50 US$124,500
2025-04-01 2025-03-31 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
100 +0.9%
142.50
US$14,250 		100 +0.9% 142.50 US$14,250
2026-03-10 2025-03-21 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
12 +0.5%
146.50
US$1,768 		12 +0.5% 146.50 US$1,768
2025-03-24 2025-03-21 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
50 +0.5%
143.50
US$7,175 		50 +0.5% 143.50 US$7,175
2025-03-14 2025-03-12 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
500 +4.9%
144.00
US$72,000 		500 +4.9% 144.00 US$72,000
2025-03-06 2025-03-05 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
500 +5.2%
146.00
US$73,000 		500 +5.2% 146.00 US$73,000
2025-03-03 2025-02-28 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
272 +2.9%
144.00
US$39,168 		272 +2.9% 144.00 US$39,168
2024-12-23 2024-12-20 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
1,000 +11.9%
152.25
US$152,250 		1,000 +11.9% 152.25 US$152,250
2026-03-10 2024-12-06 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
11 +0.4%
165.07
US$1,752 		11 +0.4% 165.07 US$1,752
2024-11-22 2024-11-21 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
6,000 -31.6%
170.26
US$1,021,560 		6,000 -31.6% 170.26 US$1,021,560
2024-11-18 2024-11-18 PrS Proposed sale
3.5
LAIRD JAMES F JR

Director

Non-Executive Director
6,000
170.72
US$1,024,320 		6,000 170.72 US$1,024,320
2024-11-14 2024-11-18 PrS Proposed sale
3.6
Meyer Paula R

Director

Non-Executive Director
300
169.18
US$50,754 		300 169.18 US$50,754
2024-11-18 2024-11-14 S Sale
3.6
Meyer Paula R
Non-Executive Director
300 -8.6%
169.00
US$50,700 		300 -8.6% 169.00 US$50,700
2024-11-12 2024-11-11 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
1,000 -5.0%
171.07
US$171,070 		1,000 -5.0% 171.07 US$171,070
2024-11-12 2024-11-08 S Sale
2.9
St. Pierre Nicole Renee
Non-Executive Director
300 -6.7%
167.00
US$50,100 		300 -6.7% 167.00 US$50,100
2024-11-08 2024-11-08 PrS Proposed sale
2.9
St. Pierre Nicole Renee

Director

Non-Executive Director
300
164.50
US$49,350 		300 164.50 US$49,350
2024-11-07 2024-11-06 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
5,000 -20.0%
168.53
US$842,650 		5,000 -20.0% 168.53 US$842,650
2024-11-05 2024-11-05 PrS Proposed sale
3.5
LAIRD JAMES F JR

Director

Non-Executive Director
6,000
157.46
US$944,760 		6,000 157.46 US$944,760
2024-09-19 2024-09-25 PrS Proposed sale
3.2
Thomas L'Quentus

Director

Non-Executive Director
250
157.15
US$39,288 		250 157.15 US$39,288
2024-09-24 2024-09-23 S Sale
3.2
Thomas L'Quentus
Non-Executive Director
250 -11.9%
161.64
US$40,410 		250 -11.9% 161.64 US$40,410
2026-03-10 2024-09-13 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
14 +0.5%
152.34
US$2,106 		14 +0.5% 152.34 US$2,106
2024-08-12 2024-08-08 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
3,000 -10.7%
150.20
US$450,600 		3,000 -10.7% 150.20 US$450,600
2024-08-01 2024-08-01 PrS Proposed sale
3.5
LAIRD JAMES F JR

Director

Non-Executive Director
3,000
156.75
US$470,250 		3,000 156.75 US$470,250
2024-07-01 2024-06-28 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
300 +0.6%
140.00
US$42,000 		300 +0.6% 140.00 US$42,000
2024-07-01 2024-06-27 B Purchase
2.3
Quinif Jo Ann

President of DHCM

Officer
400 +2.0%
139.24
US$55,696 		400 +2.0% 139.24 US$55,696
2024-07-01 2024-06-27 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
250 +0.5%
139.38
US$34,845 		250 +0.5% 139.38 US$34,845
2026-03-10 2024-06-14 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
7 +0.3%
149.44
US$1,006 		7 +0.3% 149.44 US$1,006
2024-06-04 2024-06-03 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
500 +6.3%
150.00
US$75,000 		500 +6.3% 150.00 US$75,000
2024-05-09 2024-05-17 PrS Proposed sale
3.5
LAIRD JAMES F JR

Director

Non-Executive Director
2,500
154.47
US$386,175 		2,500 154.47 US$386,175
2024-05-17 2024-05-15 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
2,500 -8.2%
158.40
US$396,000 		2,500 -8.2% 158.40 US$396,000
2024-05-15 2024-05-15 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
500 -3.7%
160.05
US$80,025 		500 -3.7% 160.05 US$80,025
2024-05-15 2024-05-14 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
2,000 -12.9%
156.75
US$313,500 		2,000 -12.9% 156.75 US$313,500
2024-05-15 2024-05-13 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
1,000 -6.1%
156.00
US$156,000 		1,000 -6.1% 156.00 US$156,000
2024-05-13 2024-05-13 PrS Proposed sale
3.1
Line Thomas Edward

Officer

Officer
4,000
155.07
US$620,280 		4,000 155.07 US$620,280
2026-03-10 2024-03-22 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
7 +0.3%
151.87
US$996 		7 +0.3% 151.87 US$996
2023-12-20 2023-12-20 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
1,500 -4.7%
170.36
US$255,540 		1,500 -4.7% 170.36 US$255,540
2023-12-20 2023-12-19 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
1,000 -3.0%
170.00
US$170,000 		1,000 -3.0% 170.00 US$170,000
2023-12-20 2023-12-18 S Sale
3.5
LAIRD JAMES F JR
Non-Executive Director
500 -1.5%
169.50
US$84,750 		500 -1.5% 169.50 US$84,750
2023-12-18 2023-12-18 PrS Proposed sale
3.5
LAIRD JAMES F JR

Director

Non-Executive Director
3,000
167.00
US$501,000 		3,000 167.00 US$501,000
2026-03-10 2023-12-08 B Purchase
3.2
Thomas L'Quentus
Non-Executive Director
6 +0.2%
166.59
US$987 		6 +0.2% 166.59 US$987
2023-11-03 2023-11-02 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
325 +0.8%
149.48
US$48,581 		325 +0.8% 149.48 US$48,581
2023-08-30 2023-09-04 PrS Proposed sale
3.6
Meyer Paula R

Director

Non-Executive Director
500
174.00
US$87,000 		500 174.00 US$87,000
2023-08-31 2023-08-30 S Sale
3.6
Meyer Paula R
Non-Executive Director
500 -15.3%
171.31
US$85,655 		500 -15.3% 171.31 US$85,655
2023-08-07 2023-08-07 PrS Proposed sale
3.1
Line Thomas Edward

Officer

Officer
3,000
176.01
US$528,030 		3,000 176.01 US$528,030
2023-03-17 2023-03-16 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
500 +8.4%
158.00
US$79,000 		500 +8.4% 158.00 US$79,000
2022-11-16 2022-11-14 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
1,500 -7.5%
182.36
US$273,540 		1,500 -7.5% 182.36 US$273,540
2022-05-02 2022-04-29 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
435 +1.2%
172.38
US$74,985 		435 +1.2% 172.38 US$74,985
2022-05-02 2022-04-28 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
301 +0.8%
171.48
US$51,615 		301 +0.8% 171.48 US$51,615
2022-04-01 2022-04-01 S Sale
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
297 -0.8%
187.30
US$55,628 		297 -0.8% 187.30 US$55,628
2022-04-01 2022-04-01 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
166 -0.8%
187.30
US$31,092 		166 -0.8% 187.30 US$31,092
2022-03-02 2022-03-02 S Sale
3.6
Meyer Paula R
Non-Executive Director
500 -21.0%
197.00
US$98,500 		500 -21.0% 197.00 US$98,500
2021-05-12 2021-05-10 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
500 -2.7%
178.50
US$89,250 		500 -2.7% 178.50 US$89,250
2021-05-12 2021-05-10 S Sale
3.1
Line Thomas Edward

Chief Financial Officer

Officer
1,000 -5.0%
177.00
US$177,000 		1,000 -5.0% 177.00 US$177,000
2021-04-01 2021-03-31 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
56 +0.2%
132.61
US$7,426 		56 +0.2% 132.61 US$7,426
2021-03-02 2021-03-01 B Purchase
3.5
LAIRD JAMES F JR
Non-Executive Director
500 +1.5%
145.20
US$72,600 		500 +1.5% 145.20 US$72,600
2021-03-02 2021-02-26 B Purchase
3.5
LAIRD JAMES F JR
Non-Executive Director
1,500 +4.7%
144.90
US$217,350 		1,500 +4.7% 144.90 US$217,350
2021-02-26 2021-02-26 B Purchase
3.7
Cooley Richard Scott
Non-Executive Director
1,500 +39.7%
142.00
US$213,000 		1,500 +39.7% 142.00 US$213,000
2020-06-11 2020-06-10 S Sale
1.5
Fortener Randolph J.
Non-Executive Director
1,000 -10.4%
120.73
US$120,730 		1,000 -10.4% 120.73 US$120,730
2020-03-16 2020-03-13 B Purchase
3.5
LAIRD JAMES F JR
Non-Executive Director
2,000 +6.7%
95.16
US$190,320 		2,000 +6.7% 95.16 US$190,320
2020-03-13 2020-03-13 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
400 +1.6%
99.00
US$39,600 		400 +1.6% 99.00 US$39,600
2020-03-12 2020-03-12 B Purchase
3.2
BRILLIANT HEATHER E

Chief Executive Officer

Executive Director
400 +1.7%
102.50
US$41,000 		400 +1.7% 102.50 US$41,000
2020-03-09 2020-03-05 B Purchase
3.5
LAIRD JAMES F JR
Non-Executive Director
2,500 +9.1%
122.75
US$306,875 		2,500 +9.1% 122.75 US$306,875
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