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QuickLinks -- Click here to rapidly navigate through this document ( Check One ) 0 Ў UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 40 - F Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 or Annual report pursuant to Section 13 ( a ) or 15 ( d ) of the Securities Exchange Act of 1934 For fiscal year ended : December 31 , 2020 Commission File Number : No. 1-12384 Canada ( Province or other jurisdiction of incorporation or organization ) SUNCOR ENERGY INC . ( Exact name of registrant as specified in its charter ) 1311,1321,2911 , 4613,5171,5172 ( Primary standard industrial classification code number , if applicable ) 150 6th Avenue S.W. P.O. Box 2844 Calgary , Alberta , Canada T2P 3E3 ( 403 ) 296-8000 ( Address and telephone number of registrant's principal executive office ) CT Corporation System 28 Liberty St. New York , New York 10005 ( 212 ) 894-8940 ( Name , address and telephone number of agent for service in the United States ) 98-0343201 ( I.R.S. employer identification number , if applicable )