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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 Maryland ( State or other jurisdiction of incorporation or organization ) 800 South Street , Suite 230 , Waltham , MA ( Address of principal executive offices ) Commission File Number : 814-01211 Great Elm Capital Corp. ( Exact name of registrant as specified in its charter ) Title of each class Common stock , par value $ 0.01 per share 6.50 % Notes due 2022 6.75 % Notes due 2025 6.50 % Notes due 2024 Large accelerated filer Non - accelerated filer Registrant's telephone number , including area code : ( 617 ) 37 3006 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) GECC GECCL GECCM GECCN | ( I.R.S. Employer Identification No. ) 81-2621577 02453 ( Zip Code ) Name of each exchange on which registered 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 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 Nasdaq Global Market Nasdaq Global Market Nasdaq Global Market Nasdaq Global Market 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 No Accelerated filer Smaller reporting company Emerging growth company 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 . No No □□□ 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 X The aggregate market value of the voting stock held by non - affiliates of the registrant was $ 33.9 million as of June 30 , 2020 . As of March 9 , 2021 , there were 23,508,232 outstanding shares of the registrant's common stock . Documents Incorporated by Reference Portions of the proxy statement for the 2021 annual meeting of stockholders ( " Proxy Statement " ) of the registrant , to be filed with the Securities and Exchange Commission within 120 days of our fiscal year ended December 31 , 2020 , are incorporated by reference into Part III of this report .