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( Mark One ) 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 1934 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF For the transition period from Western Midstream Partners , LP Western Midstream Operating , LP WESTERN MIDSTREAM PARTNERS , LP WESTERN MIDSTREAM OPERATING , LP ( Exact name of registrant as specified in its charter ) Western Midstream Partners , LP Western Midstream Operating , LP Western Midstream Partners , LP Western Midstream Operating , LP to Or Commission file number : 001-35753 001-34046 State or other jurisdiction of incorporation or organization : Delaware Delaware Western Midstream Partners , LP Western Midstream Operating , LP Address of principal executive offices : 9950 Woodloch Forest Drive , Suite 2800 9950 Woodloch Forest Drive , Suite 2800 Securities registered pursuant to Section 12 ( b ) of the Act : The Woodlands , Texas The Woodlands , Texas I.R.S. Employer Identification No .: Title of each class Trading symbol Common units None Securities registered pursuant to Section 12 ( g ) of the Act : None WES None Zip Code : 77380 77380 Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Western Midstream Partners , LP Western Midstream Operating , LP Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Western Midstream Partners , LP Western Midstream Operating , LP 46-0967367 26-1075808 Registrant's telephone number , including area code : ( 832 ) 636-1009 ( 832 ) 636-1009 Name of exchange on which registered New York Stock Exchange None Yes p Yes p Yes Yes No 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 . Western Midstream Partners , LP Western Midstream Operating , LP Yes p Yes p No p No p 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 ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes p No Yes p No "