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Table of Contents ( Mark One ) ☑ ㅁ 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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Bermuda ( State or Other Jurisdiction of Incorporation or Organization ) Crown House Second Floor 4 Par - la - Ville Road Hamilton , HM08 Bermuda ( Address of principal executive offices ) Commission File Number 001-32657 NABORS INDUSTRIES LTD . ( Exact name of registrant as specified in its charter ) 98-0363970 ( I.R.S. Employer Identification No. ) N / A ( Zip Code ) ( 441 ) 292-1510 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Securities Exchange Act of 1934 : Title of each class Common shares , $ .05 par value per share Preferred shares , 6.00 % Mandatory Convertible Preferred Shares , Series A , $ .001 par value per share Trading Symbol ( s ) NBR NBR.PRA Name of each exchange on which registered New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Securities Exchange Act of 1934 : None . New York Stock Exchange Indicate by check mark whether 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 file such reports ) . YES NO □ Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S - K is not contained herein , and will not be contained , to the best of registrant's knowledge , in definitive proxy or information statements incorporated by reference in Part III of this Form 10 - K or any amendment to this Form 10 - K . Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer or a smaller reporting company . See definition of " large accelerated filer " , " accelerated filer ” , “ smaller reporting company " and " emerging growth company ” in Rule 12b - 2 of the Exchange Act . Large Accelerated Filer Accelerated Filer > Non - 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 . 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 The aggregate market value of the 6,880,196 common shares held by non - affiliates of the registrant outstanding as of the last business day of our most recently completed second fiscal quarter , June 30 , 2020 , based on the closing price of our common shares as of such date of $ 37.02 per share as reported on the New York Stock Exchange , was $ 254,704,856 . Common shares held by each officer and director and by each person who owns 5 % or more of the outstanding common shares have been excluded in that such persons may be deemed affiliates . This determination of affiliate status is not necessarily a conclusive determination for other purposes . The number of common shares outstanding as of February 19 , 2021 was 7,359,588 , excluding 1,090,003 common shares held by our subsidiaries , or 8,449,591 in the aggregate . DOCUMENTS INCORPORATED BY REFERENCE Specified portions of the definitive Proxy Statement to be distributed in connection with our 2021 Annual General Meeting of Shareholders ( Part III ) .