Griffon President Mehmel sells 3,240 GFF shares

Griffon Corp President and COO Robert F. Mehmel reported selling 3,240 shares of common stock on 2026-08-11 in a sale characterized as an open market or private transaction, pursuant to a Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

Griffon Corp President and COO Robert F. Mehmel reported selling 3,240 shares of common stock on 2026-08-11 in a sale characterized as an open market or private transaction, pursuant to a Rule 10b5-1 trading plan. The weighted average sale price was $107.16 per share, with individual trades executed between $107.00 and $107.72. Following this sale, he directly holds 723,032 common shares and has an additional 4,219 shares held indirectly through an ESOP.

Insider Trade Summary 10b5-1

Net Seller: 3,240 shares

Net Sell 2 txns

Insider MEHMEL ROBERT F

Role President and COO

Sold 3,240 shs ($347K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	3,240	$107.16	$347K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 723,032 shares (Direct); Common Stock — 4,219 shares (Indirect, by ESOP)

Footnotes (1)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.00 to $107.72, inclusive. The reporting person undertakes to provide Griffon Corporation, any security holder of Griffon Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares disposed of at each price within the range set forth in this footnote.

Key Figures

Shares sold: 3,240 shares Weighted average sale price: $107.16 per share Sale price range: $107.00–$107.72 per share +2 more

5 metrics

Shares sold 3,240 shares Common stock sale by Robert F. Mehmel on 2026-08-11

Weighted average sale price $107.16 per share Weighted average price across multiple sale transactions

Sale price range $107.00–$107.72 per share Range of prices for the multiple sale transactions

Direct holdings after sale 723,032 shares Direct GRIFFON CORP common shares held by Mehmel after transaction

Indirect ESOP holdings 4,219 shares Shares held indirectly by ESOP associated with Mehmel

Key Terms

Rule 10b5-1 trading plan, weighted average price, open market or private transaction, ESOP

4 terms

Rule 10b5-1 trading plan regulatory

"The transaction was effected pursuant to a Rule 10b5-1 trading plan."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"Transaction code S described as a sale in open market or private transaction."

ESOP financial

"Indirect ownership of 4,219 shares reported as held by ESOP."

An Employee Stock Ownership Plan (ESOP) is a program that gives employees ownership shares in their company, often as part of their benefits package. It acts like a company-sponsored savings plan, allowing workers to have a stake in the company's success, which can boost motivation and loyalty. For investors, ESOPs can influence company decisions and stock value, making them an important aspect of corporate ownership and governance.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did GRIFFON CORP (GFF) report for Robert F. Mehmel?

GRIFFON CORP reported that President and COO Robert F. Mehmel sold 3,240 common shares on 2026-08-11. The transaction was reported as a sale in an open market or private transaction pursuant to a Rule 10b5-1 trading plan.

At what prices were the 3,240 GFF shares sold by Robert F. Mehmel?

The 3,240 shares were sold at a weighted average price of $107.16 per share. According to the disclosure, individual trades occurred in a price range between $107.00 and $107.72, inclusive, across multiple transactions on that date.

How many GFF shares does Robert F. Mehmel hold after this reported sale?

After the reported sale, Robert F. Mehmel directly holds 723,032 shares of GRIFFON CORP common stock. In addition, he has 4,219 shares held indirectly through an ESOP, as reflected in the holdings information reported.

Was the August 11, 2026 GFF insider sale made under a Rule 10b5-1 plan?

Yes. The filing indicates the transaction was effected under a Rule 10b5-1 trading plan. Such plans pre-arrange trading activity, which can reduce the informational value of the transaction’s timing about the insider’s current views.

What type of transaction code was used for Robert F. Mehmel’s GFF share sale?

The transaction used code S, described as a sale in open market or private transaction. This code confirms the 3,240 GRIFFON CORP common shares reported on August 11, 2026 were disposed of rather than acquired.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/13/2026 - 04:31 PM Accepted by SEC EDGAR 08/13/2026 - 04:30 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

X

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^*

MEHMEL ROBERT F

(Last) (First) (Middle)

C/O GRIFFON CORPORATION

712 FIFTH AVENUE

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
GRIFFON CORP [ GFF ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and COO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/11/2026		S		3,240	D	$107.16(1)	723,032	D
Common Stock								4,219	I	by ESOP

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.00 to $107.72, inclusive. The reporting person undertakes to provide Griffon Corporation, any security holder of Griffon Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares disposed of at each price within the range set forth in this footnote.

Remarks:

	/s/ Seth L. Kaplan, as attorney-in-fact	08/13/2026
	** Signature of Reporting Person	Date
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.
* Form 4: SEC 1474 (03-26)