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( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 27 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES AND EXCHANGE ACT OF 1934 Delaware ( State or other jurisdiction of incorporation or organization ) KRATOS DEFENSE & SECURITY SOLUTIONS , INC . ( Exact name of Registrant as specified in its charter ) SECURITIES Title of each class Common Stock , $ 0.001 par value FORM 10 - K Commission file number 001-34460 Large accelerated filer Non - accelerated filer 13-3818604 ( I.R.S. Employer Identification No. ) 1 Chisholm Trail , Suite 3200 Round Rock , TX 78681 ( 512 ) 238-9840 ( Address , including zip code , and telephone number , including area code , of Registrant's principal executive offices ) REGISTERED PURSUANT TO SECTION 12 ( b ) OF THE ACT Trading Symbol ( s ) . KTOS 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 ý 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 ý 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 ý No o 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 ý No o ý Name of each exchange on which registered The NASDAQ Global Select Market 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 : 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 . O 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 . Yes ý No Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No ý The aggregate market value of the registrant's voting and non - voting common stock held by non - affiliates as of June 26 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , was approximately $ 1.8 billion , based on the closing sale price for shares of the registrant's common stock as reported by the NASDAQ Global Select Market on such date . This disclosure excludes shares of common stock held by executive officers , directors and stockholders whose individual ownership exceeded 10 % of the common stock outstanding on June 26 , 2020 because such persons may be deemed to be affiliates . This determination of affiliate status is not necessarily a conclusive determination for any other purpose . As of February 19 , 2021 , 123,463,096 shares of the registrant's common stock were outstanding .