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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 Fiscal Year Ended December 31 , 2020 Or 2021 Spring Road , Suite 600 ( Address of principal executive offices ) For the Transition Period from Commission File Number 001-32504 Delaware ( State or other jurisdiction of incorporation or organization ) TreeHouse Foods , Inc. ( Exact name of the registrant as specified in its charter ) Title of Each Class Common Stock , $ .01 par value TreeHouse to Oak Brook , IL 20-2311383 ( I.R.S. employer identification no . ) Registrant's telephone number , including area code ( 708 ) 483-1300 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol 60523 ( Zip Code ) THS Securities registered pursuant to section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Name of Each Exchange on Which Registered New York Stock Exchange Yes p No " 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 No p 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 p No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrant was required to submit and post such files ) . Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer or a smaller reporting company . See the definitions of " large accelerated filer " , " accelerated filer " and " smaller reporting company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Non - accelerated filer Accelerated filer Smaller reporting company ■ Emerging growth 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 of 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 . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No p The aggregate market value of the registrant's common stock held by non - affiliates as of June 30 , 2020 , based on the $ 43.80 per share closing price on the New York Stock Exchange on such date , was approximately $ 2,457.3 million . Shares of common stock held by executive officers and directors of the registrant have been excluded from this calculation because such persons may be deemed to be affiliates . The number of shares of the registrant's common stock outstanding as of January 29 , 2021 was 55,892,015 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive Proxy Statement for its Annual Meeting of Stockholders to be held on April 29 , 2021 are incorporated by reference into Part III of this Form 10 - K .