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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 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware ( State or other jurisdiction of incorporation or organization ) Commission file number 1-12387 TENNECO INC . ( Exact name of registrant as specified in its charter ) 500 North Field Drive Lake Forest , IL ( Address of principal executive offices ) Registrant's telephone number , including area code : ( 847 ) 482-5000 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Class A Voting Common Stock , par value $ .01 per share Preferred Stock Purchase Rights Trading Symbol ΤΕΝ 76-0515284 ( I.R.S. Employer Identification No. ) 60045 ( Zip Code ) Name of each Exchange on which registered New York Stock Exchange New York Stock Exchange No No 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 . 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 □ Note Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15 ( d ) of the Exchange Act from their obligations under those Sections . 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 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or 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 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 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 Exchange Act ) . Yes The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant as of June 30 , 2020 , computed by reference to the price at which the registrant's common stock was last sold on the New York Stock Exchange on June 30 , 2020 , was approximately $ 0.4 billion . The number of shares of Class A Voting Common Stock , par value $ 0.01 per share : 66,435,872 shares outstanding as of February 22 , 2021. The number of shares of Class B Non - Voting Common Stock , par value $ 0.01 per share : 15,253,363 shares outstanding as of February 22 , 2021 . Documents Incorporated by Reference : Portions of Tenneco Inc.'s Definitive Proxy Statement related to the 2021 Annual Meeting of Stockholders to be filed subsequently are incorporated by reference into Part III of this Form 10 - K .