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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 number 1-13926 DIAMOND OFFSHORE DRILLING , INC . ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 15415 Katy Freeway Houston , Texas 77094 76-0321760 ( I.R.S. Employer Identification No. ) ( Address and zip code of principal executive offices ) ( 281 ) 492-5300 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Exchange Act : None Securities registered pursuant to Section 12 ( g ) of the Exchange 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 ( 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 ) . 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 . Large accelerated filer П ✔ 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 . $ 16,882,138 | 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 Exchange 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 . As of June 30 , 2020 Indicate the number of shares outstanding of each of the registrant's classes of common stock , as of the latest practicable date . As of February 4 , 2021 Common Stock , $ 0.01 par value per share DOCUMENTS INCORPORATED BY REFERENCE The information called for by Part III , Items 10 , 11 , 12 , 13 and 14 of this Form 10 - K , will be included in a definitive proxy statement or an amendment to this Form 10 - K to be filed within 120 days after the end of the fiscal year covered by this Form 10 - K , and is incorporated herein by reference . 138,054,311 shares ||