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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Delaware ( State or Other Jurisdiction of Incorporation or Organization ) 1000 Abernathy Road NE , Atlanta , Georgia ( Address of Principal Executive Offices ) Title of each class Common Stock , par value $ 0.01 per share For the fiscal year ended September 30 , 2021 OR to Commission file number 001-38736 WESTROCK COMPANY ( Exact Name of Registrant as Specified in Its Charter ) Registrant's Telephone Number , Including Area Code : ( 770 ) 448-2193 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) WRK Securities registered pursuant to Section 12 ( g ) of the Act : None No No 37-1880617 ( I.R.S. Employer Identification No. ) 30328 ( 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 > 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 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 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 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 . Large accelerated filer > Non - accelerated filer Emerging growth company DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive Proxy Statement for the Annual Meeting of Stockholders to be held on January 28 , 2022 are incorporated by reference in Part III . Accelerated filer Smaller reporting company 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 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 . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No The aggregate market value of the common equity held by non - affiliates of the registrant as of March 31 , 2021 ( based on the closing price per share as reported on the New York Stock Exchange on such date ) , was approximately $ 13,705 million . As of November 5 , 2021 , the registrant had 265,001,543 shares of Common Stock , par value $ 0.01 per share , outstanding .