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Table of Contents Index to Financial Statements 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 0 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-14569 PLAINS ALL AMERICAN PIPELINE , L.P. ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 333 Clay Street , Suite 1600 , Houston , Texas ( Address of principal executive offices ) Title of Each Class Common Units Registrant's telephone number , including area code : ( 713 ) 646-4100 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) PAA Securities registered pursuant to Section 12 ( g ) of the Act : None 76-0582150 ( I.R.S. Employer Identification No. ) 77002 ( Zip Code ) Large accelerated filer Non - accelerated filer Name of Each Exchange on Which Registered Nasdaq 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 No 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 . 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 Common Units held by non - affiliates of the registrant ( treating all executive officers and directors of the registrant and holders of 10 % or more of the Common Units outstanding , for this purpose , as if they may be affiliates of the registrant ) was approximately $ 4.2 billion on June 30 , 2020 , based on a closing price of $ 8.84 per Common Unit as reported on the New York Stock Exchange on such date . As of February 11 , 2021 , there were 722,052,254 Common Units outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive Proxy Statement to be filed pursuant to Regulation 14A pertaining to the 2021 Annual Meeting of Unitholders are incorporated by reference into Part III hereof . The registrant intends to file such Proxy Statement no later than 120 days after the end of the fiscal year covered by this Form 10 - K .