UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT ☒ OF 1934 For the quarterly period ended March 31, 2024 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ☐ ACT OF 1934 For the transition period from to Commission File Number: 1-06620 GRIFFON CORPORATION (Exact name of registrant as specified in its charter) Delaware 11-1893410 (State or other jurisdiction of (I.R.S. Em ...