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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal period ended December 31 , 2020 OR Commission File Number 001-37976 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Exact name of registrant as specified in its charter and principal office address and telephone number 1-7850 Southwest Gas Holdings , Inc. 8360 S. Durango Dr. Post Office Box 98510 Las Vegas , Southwest Gas Corporation 8360 S. Durango Dr. Post Office Box 98510 Las Vegas , Nevada ( 702 ) 876-7237 FORM 10 - K Nevada ( 702 ) 876-7237 Title of each class Southwest Gas Holdings , Inc. Common Stock , $ 1 par value Southwest Gas Holdings , Inc .: Large accelerated filer Non - accelerated filer Emerging growth company 89193-8510 □ □ □ 89193-8510 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol SWX State of Incorporation Delaware Yes California 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 . Southwest Gas Holdings , Inc. Southwest Gas Corporation No I.R.S. Employer Identification No. 81-3881866 88-0085720 Name of each exchange on which registered New York Stock Exchange Yes No | No > Indicate by check mark if each registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes Indicate by check mark whether each 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 each 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 No Indicate by check mark whether each 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