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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 1934 TRANSITION REPORT PURSUANT TO SECTION 13 or 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF Delaware ( State or other jurisdiction of incorporation or organization ) 712 Fifth Ave , 18th Floor FORM 10 - K For the year ended September 30 , 2021 GRIFFON CORPORATION ( Exact name of registrant as specified in its charter ) OR Commission File No. 1-06620 Title of each class Common Stock , $ 0.25 par value ( Address of Principal Executive Offices ) New York New York Securities registered pursuant to Section 12 ( b ) of the Act : ( 212 ) 957-5000 ( Registrant's telephone number , including area code ) Trading Symbol ( s ) GFF 11-1893410 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( g ) of the Act : None 10019 ( Zip Code ) Name of each exchange on which registered New York Stock Exchange Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes x No o Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes o No X Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes x No o