Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 10, 2019 GRIFFON CORPORATION (Exact name of registrant as specified in its charter) Commission File Number: 1-06620 Delaware 11-1893410 (State or other jurisdiction of incorporation) (IRS Employer Identification No.) 712 Fifth Avenue, 18th Floor New York, New York 10019 (Address of principal executive offices, including zip code) (212) 957-5000 (Registrant’s telephone number, including area code) (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company o If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o Item 8.01. Other Events On May 10, 2019, Griffon Corporation (the “Company”) issued a press release announcing that it has (1) withdrawn its previously announced offering of up to $500 million of senior notes due 2027 in response to market conditions and (2) withdrawn its previously announced conditional tender offer to purchase up to $500 million aggregate principal amount of its 5.25% Senior Notes due 2022. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Item 9.01. Financial Statements and Exhibits (d) Exhibits . 99.1 Press Release, dated May 10, 2019. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. GRIFFON CORPORATION Date: May 10, 2019 By: /s/ Seth L. Kaplan Seth L. Kaplan Senior Vice President, General Counsel and Secretary