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Table of Contents ( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended August 31 , 2021 . OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Delaware ( State or other jurisdiction of incorporation or organization ) ACUITY BRANDS , INC . ( Exact name of registrant as specified in its charter ) Title of each class Common stock , $ 0.01 par value per share Large Accelerated Filer Smaller Reporting Company 001-16583 ( Commission File Number ) 1170 Peachtree Street , N.E. , Suite 2300 , Atlanta , Georgia 30309-7676 ( Address of principal executive offices ) ( 404 ) 853-1400 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol AYI ( I.R.S. Employer Identification Number ) No No Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by checkmark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by checkmark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes 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 No Accelerated Filer Emerging Growth Company 58-2632672 Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No Name of each exchange on which registered New York Stock Exchange Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Location in Form 10 - K Part II , Item 5 ; Part III , Items 10 , 11 , 12 , 13 , and 14 Non - accelerated Filer 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 . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . No Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes Based on the closing price of the Registrant's common stock of $ 123.30 as quoted on the New York Stock Exchange on February 28 , 2021 , the aggregate market value of the voting stock held by nonaffiliates of the registrant was $ 4.37 billion . The number of shares outstanding of the registrant's common stock , $ 0.01 par value , was 34,924,594 shares as of October 22 , 2021 . DOCUMENTS INCORPORATED BY REFERENCE Incorporated Document Proxy Statement for 2021 Annual Meeting of Stockholders