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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ( Mark One ) 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 Netherlands ( State or other jurisdiction of incorporation or organization ) 1221 McKinney St. , Suite 300 Houston , Texas USA 77010 Commission file number : 001-34726 LyondellBasell Industries N.V. ( Exact name of registrant as specified in its charter ) ( 713 ) 309-7200 4th Floor , One Vine Street London W1J0AH Title of Each Class Ordinary Shares , € 0.04 Par Value 98-0646235 ( I.R.S. Employer Identification No. ) United Kingdom ( Address of principal executive offices ) ( Zip Code ) +44 ( 0 ) 207 220 2600 ( Registrant's telephone numbers , including area codes ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol LYB 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 . p 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 p 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 . p Yes No Delftseplein 27E 3013AA Rotterdam Netherlands +31 ( 0 ) 10 2755 500 Name of Each Exchange On Which Registered New York Stock Exchange 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 ) . p Yes No 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 the definitions of " large accelerated filer , " " accelerated filer " and " smaller reporting company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : 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 Act ) . Yes No The aggregate market value of common stock held by non - affiliates of the registrant on June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , based on the closing price on that date of $ 65.72 , was $ 16.8 billion . For purposes of this disclosure , in addition to the registrant's executive officers and members of its Board of Directors , the registrant has included Access Industries , LLC and its affiliates as “ affiliates . ” The registrant had 334,132,558 shares outstanding at February 23 , 2021 ( excluding 5,913,070 treasury shares ) . Documents incorporated by reference : Portions of the 2021 Proxy Statement , in connection with the Company's 2021 Annual Meeting of Shareholders ( in Part III ) , as indicated herein .