Griffon Corporation (GFF) Insider Trading

Last 12 months

Insiders bought $80k and sold $36.7M on the open market.

62% of the selling was scheduled in advance under 10b5-1 plans. Chairman of the Board and CEO Ronald J Kramer sold $9.49M on Jun 12, 5.2% of their stake, outside a plan.

Net open-market

−$36.6M

1 buy · 21 sales

Under a 10b5-1 plan

62%

of the value sold

Insiders who bought / sold

1 / 10

executives and directors

Last open-market buy

Mar 2026

Mar 5, 2026

Get an email when GFF's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 13	Cheryl L Turnbull Director	SoldNo plan	3,000	$106.12	$318k	9.1%	Form 4
Aug 13	Kevin F Sullivan Director	SoldNo plan	3,500	$105.59	$370k	7.9%	Form 4
Aug 11	Robert F Mehmel President and COO	Sold10b5-1 plan	3,240	$107.16	$347k	0.4%	Form 4
Aug 7 – 10	Robert F Mehmel President and COO	Sold10b5-1 plan 6 parts	22,567	$106.47 average	$2.4M	3.0%	Form 4
Aug 7	Brian G Harris EVP, Chief Financial Officer	Sold10b5-1 plan	5,267	$107.11	$564k	3.8%	Form 4
Aug 5 – 6	Robert F Mehmel President and COO	Sold10b5-1 plan 12 parts	37,061	$103.32 average	$3.83M	4.7%	Form 4
Aug 5	Brian G Harris EVP, Chief Financial Officer	Sold10b5-1 plan 2 parts	11,050	$103.27 average	$1.14M	7.4%	Form 4
Aug 5	Ronald J Kramer Chairman of the Board and CEO	Sold10b5-1 plan 5 parts	100,000	$102.42 average	$10.2M	5.5%	Form 4
Jun 30	Robert F Mehmel President and COO	Sold10b5-1 plan	4,166	$97.76	$407k	0.5%	Form 4
Jun 30	Brian G Harris EVP, Chief Financial Officer	Sold10b5-1 plan	6,183	$98.01	$606k	4.0%	Form 4
Jun 26	Robert F Mehmel President and COO	Sold10b5-1 plan 3 parts	286	$95.66 average	$27k	<0.1%	Form 4
Jun 24 – 25	Robert F Mehmel President and COO	Sold10b5-1 plan 5 parts	12,599	$95.81 average	$1.21M	1.6%	Form 4
Jun 16 – 17	Robert F Mehmel President and COO	Sold10b5-1 plan 3 parts	3,565	$95.39 average	$340k	0.4%	Form 4
Jun 12 – 15	Robert F Mehmel President and COO	Sold10b5-1 plan 2 parts	8,773	$95.26 average	$836k	1.1%	Form 4
Jun 12	Ronald J Kramer Chairman of the Board and CEO	SoldNo plan 2 parts	100,000	$94.92 average	$9.49M	5.2%	Form 4
Jun 11	Brian G Harris EVP, Chief Financial Officer	Sold10b5-1 plan	7,500	$95.03	$713k	4.6%	Form 4
Mar 5	Henry A Alpert Director	Bought	1,000	$79.99	$80k	1.4%	Form 4
Feb 17	W. Christopher Durborow Vice President & CAO	SoldNo plan	10,000	$91.97	$920k	23%	Form 4
Feb 13	Louis J. Grabowsky Director	SoldNo plan	11,000	$93.06	$1.02M	21%	Form 4
Feb 12	Michelle L Taylor Director	SoldNo plan	1,650	$92.56	$153k	15%	Form 4
Feb 9	Seth L. Kaplan Sr VP, Gen. Counsel and Secy	SoldNo plan 4 parts	15,000	$95.44 average	$1.43M	11%	Form 4
Feb 9	James W Sight Director	SoldNo plan	3,070	$96.15	$295k	18%	Form 4
Feb 7, 2025	Samanta Hegedus Director	SoldNo plan	1,236	$79.47	$98k	5.1%	Form 4
Feb 6, 2025	Cheryl L Turnbull Director	SoldNo plan	3,000	$80.80	$242k	8.9%	Form 4
Feb 6, 2025	James W Sight Director	SoldNo plan	1,360	$81.00	$110k	8.1%	Form 4
Dec 6, 2024	W. Christopher Durborow Vice President & CAO	SoldNo plan	5,170	$80.38	$416k	9.8%	Form 4
Dec 2, 2024	Seth L. Kaplan Sr VP, Gen. Counsel and Secy	Sold10b5-1 plan 3 parts	12,666	$82.73 average	$1.05M	7.8%	Form 4
Dec 2, 2024	Brian G Harris EVP, Chief Financial Officer	Sold10b5-1 plan 2 parts	18,540	$82.60 average	$1.53M	9.8%	Form 4
Nov 26, 2024 – Nov 29, 2024	Victor Eugene Renuart Director	SoldNo plan 4 parts	10,846	$45.47 average	$493k	36%	Form 4
Nov 18, 2024	Kevin F Sullivan Director	SoldNo plan	9,222	$75.50	$696k	18%	Form 4
Nov 14, 2024	James W Sight Director	SoldNo plan	3,660	$76.42	$280k	18%	Form 4
Nov 14, 2024	Jerome L Coben Director	SoldNo plan	2,052	$76.34	$157k	11%	Form 4
Nov 14, 2024	Samanta Hegedus Director	SoldNo plan	3,095	$80.49	$249k	11%	Form 4
Nov 14, 2024	Louis J. Grabowsky Director	SoldNo plan 2 parts	11,000	$77.02 average	$847k	18%	Form 4
Nov 13, 2024	Robert F Mehmel President and COO	Sold10b5-1 plan 5 parts	25,000	$74.97 average	$1.87M	3.4%	Form 4
Nov 11, 2024 – Nov 13, 2024	Ronald J Kramer Chairman of the Board and CEO	Sold10b5-1 plan 9 parts	308,921	$74.20 average	$22.9M	14%	Form 4
Nov 11, 2024	Robert F Mehmel President and COO	Sold10b5-1 plan	8,697	$70.10	$610k	1.2%	Form 4

Aug 13No plan
Cheryl L Turnbull
Director · sold 3,000 at $106.12
$318k
9.1% of stake
Aug 13No plan
Kevin F Sullivan
Director · sold 3,500 at $105.59
$370k
7.9% of stake
Aug 1110b5-1 plan
Robert F Mehmel
President and COO · sold 3,240 at $107.16
$347k
0.4% of stake
Aug 7 – 1010b5-1 plan
Robert F Mehmel
President and COO · sold 22,567 at avg $106.47
$2.4M
3.0% of stake
Aug 710b5-1 plan
Brian G Harris
EVP, Chief Financial Officer · sold 5,267 at $107.11
$564k
3.8% of stake
Aug 5 – 610b5-1 plan
Robert F Mehmel
President and COO · sold 37,061 at avg $103.32
$3.83M
4.7% of stake
Aug 510b5-1 plan
Brian G Harris
EVP, Chief Financial Officer · sold 11,050 at avg $103.27
$1.14M
7.4% of stake
Aug 510b5-1 plan
Ronald J Kramer
Chairman of the Board and CEO · sold 100,000 at avg $102.42
$10.2M
5.5% of stake
Jun 3010b5-1 plan
Robert F Mehmel
President and COO · sold 4,166 at $97.76
$407k
0.5% of stake
Jun 3010b5-1 plan
Brian G Harris
EVP, Chief Financial Officer · sold 6,183 at $98.01
$606k
4.0% of stake
Jun 2610b5-1 plan
Robert F Mehmel
President and COO · sold 286 at avg $95.66
$27k
<0.1% of stake
Jun 24 – 2510b5-1 plan
Robert F Mehmel
President and COO · sold 12,599 at avg $95.81
$1.21M
1.6% of stake
Jun 16 – 1710b5-1 plan
Robert F Mehmel
President and COO · sold 3,565 at avg $95.39
$340k
0.4% of stake
Jun 12 – 1510b5-1 plan
Robert F Mehmel
President and COO · sold 8,773 at avg $95.26
$836k
1.1% of stake
Jun 12No plan
Ronald J Kramer
Chairman of the Board and CEO · sold 100,000 at avg $94.92
$9.49M
5.2% of stake
Jun 1110b5-1 plan
Brian G Harris
EVP, Chief Financial Officer · sold 7,500 at $95.03
$713k
4.6% of stake
Mar 5
Henry A Alpert
Director · bought 1,000 at $79.99
$80k
1.4% of stake
Feb 17No plan
W. Christopher Durborow
Vice President & CAO · sold 10,000 at $91.97
$920k
23% of stake
Feb 13No plan
Louis J. Grabowsky
Director · sold 11,000 at $93.06
$1.02M
21% of stake
Feb 12No plan
Michelle L Taylor
Director · sold 1,650 at $92.56
$153k
15% of stake
Feb 9No plan
Seth L. Kaplan
Sr VP, Gen. Counsel and Secy · sold 15,000 at avg $95.44
$1.43M
11% of stake
Feb 9No plan
James W Sight
Director · sold 3,070 at $96.15
$295k
18% of stake
Feb 7, 2025No plan
Samanta Hegedus
Director · sold 1,236 at $79.47
$98k
5.1% of stake
Feb 6, 2025No plan
Cheryl L Turnbull
Director · sold 3,000 at $80.80
$242k
8.9% of stake
Feb 6, 2025No plan
James W Sight
Director · sold 1,360 at $81.00
$110k
8.1% of stake
Dec 6, 2024No plan
W. Christopher Durborow
Vice President & CAO · sold 5,170 at $80.38
$416k
9.8% of stake
Dec 2, 202410b5-1 plan
Seth L. Kaplan
Sr VP, Gen. Counsel and Secy · sold 12,666 at avg $82.73
$1.05M
7.8% of stake
Dec 2, 202410b5-1 plan
Brian G Harris
EVP, Chief Financial Officer · sold 18,540 at avg $82.60
$1.53M
9.8% of stake
Nov 26, 2024 – Nov 29, 2024No plan
Victor Eugene Renuart
Director · sold 10,846 at avg $45.47
$493k
36% of stake
Nov 18, 2024No plan
Kevin F Sullivan
Director · sold 9,222 at $75.50
$696k
18% of stake
Nov 14, 2024No plan
James W Sight
Director · sold 3,660 at $76.42
$280k
18% of stake
Nov 14, 2024No plan
Jerome L Coben
Director · sold 2,052 at $76.34
$157k
11% of stake
Nov 14, 2024No plan
Samanta Hegedus
Director · sold 3,095 at $80.49
$249k
11% of stake
Nov 14, 2024No plan
Louis J. Grabowsky
Director · sold 11,000 at avg $77.02
$847k
18% of stake
Nov 13, 202410b5-1 plan
Robert F Mehmel
President and COO · sold 25,000 at avg $74.97
$1.87M
3.4% of stake
Nov 11, 2024 – Nov 13, 202410b5-1 plan
Ronald J Kramer
Chairman of the Board and CEO · sold 308,921 at avg $74.20
$22.9M
14% of stake
Nov 11, 202410b5-1 plan
Robert F Mehmel
President and COO · sold 8,697 at $70.10
$610k
1.2% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch GFF, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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