GRIFFON CORP

On August 18, 2026, Griffon Corporation (the “Company”) completed its previously announced notes offering (the “Notes Offering”) of $800 million aggregate principal amount of 6.25% senior notes due 2034 (the “Notes”). The Notes were sold in a private placement pursuant to a purchase agreement, dated August 10, 2026, among the Company, the guarantors named therein (the “Guarantors”) and BofA Securities, Inc., as representative of the several initial purchasers of the Notes (the “Initial Purchasers”). The Notes were resold by the Initial Purchasers to qualified institutional buyers pursuant to Rule 144A of the Securities Act of 1933, as amended (the “Securities Act”), and to non-U.S. persons pursuant to Regulation S of the Securities Act. The Notes have not been registered under the Securities Act or the securities laws of any other jurisdiction and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements thereunder. The net proceeds to the Company from the Notes Offering were approximately $792 million.

Indenture

In connection with the Notes Offering, the Company entered into an Indenture (the “Indenture”), dated as of August 18, 2026, among the Company, the Guarantors and Computershare Trust Company, N.A., as trustee (the “Trustee”).

Certain terms and conditions of the Notes and the Indenture are as follows:

Maturity. The Notes mature on October 1, 2034.

Interest. The Notes accrue interest at a rate of 6.25% per year. Interest on the Notes is paid semi-annually on each April 1 and October 1, beginning on April 1, 2027.