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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , DC 20549 ( 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 FORM 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from_ to Commission file number : 001-33067 SELECTIVE INSURANCE GROUP , INC . ( Exact Name of Registrant as Specified in Its Charter ) New Jersey ( State or Other Jurisdiction of Incorporation or Organization ) Securities registered pursuant to Section 12 ( b ) of the Act : or Title of each class 40 Wantage Avenue Branchville , New Jersey 07890 ( Address of Principal Executive Offices ) ( Zip Code ) 973 948-3000 ( Registrant's Telephone Number , Including Area Code ) Common Stock , par value $ 2 share Depositary Shares , each representing a 1 / 1,000th interest in a share of 4.60 % Non - Cumulative Preferred Stock , Series B , without par value None ( I.R.S. Employer Identification No. ) 22-2168890 Trading Symbol ( s ) SIGI SIGIP Securities registered pursuant to Section 12 ( g ) of the Act : 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 The Nasdaq Stock Market LLC The Nasdaq Stock Market LLC 1 Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . X Yes Yes No > 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 ( 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . X 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 .