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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 December 31 , 2020 or Transition Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 1-13653 AMERICAN FINANCIAL GROUP , INC . AMERICAN FINANCIAL GROUP , INC . 301 East Fourth Street , Cincinnati , Ohio 45202 ( 513 ) 579-2121 Incorporated under the Laws of Ohio Securities Registered Pursuant to Section 12 ( b ) of the Act : Title of Each Class Common Stock 5.875 % Subordinated Debentures due March 30 , 2059 5.625 % Subordinated Debentures due June 1 , 2060 5.125 % Subordinated Debentures due December 15 , 2059 4.50 % Subordinated Debentures due September 15 , 2060 Trading Symbol ( s ) , AFG AFGB AFGD AFGC AFGE IRS Employer I.D. No. 31-1544320 Name of Each Exchange on Which Registered New York Stock Exchange New York Stock Exchange New York Stock Exchange New York Stock Exchange New York Stock Exchange 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 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 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 , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Accelerated filer 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 . 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 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 Smaller reporting company Non - accelerated filer 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 . Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No State the aggregate market value of the voting and non - voting common equity held by non - affiliates computed by reference to the price at which the common equity was last sold , or the average bid and asked price of such common equity , as of the last business day of the Registrant's most recently completed second fiscal quarter : $ 4.91 billion . Indicate the number of shares outstanding of each of the Registrant's classes of common stock , as of the latest practicable date : 86,399,280 shares ( excluding 14.9 million shares owned by subsidiaries ) as of February 1 , 2021 . Documents Incorporated by Reference : Proxy Statement for 2021 Annual Meeting of Stockholders ( portions of which are incorporated by reference into Part III hereof ) .