SOUTHWEST GAS CORP

The Company, a Delaware corporation, is a holding company headquartered in Las Vegas, Nevada, owning all of the shares of common stock of Southwest Gas and, until the Centuri IPO on April 22, 2024, all of the shares of common stock of Centuri. The Company operated two reportable segments until August 2025, the Natural Gas Distribution segment (Southwest Gas) and Utility Infrastructure Services segment (Centuri). After the deconsolidation of Centuri in August 2025, the business is solely comprised of the Natural Gas Distribution segment. The Company is incorporated in Delaware, and Southwest Gas is incorporated in California.

The Company, through its operating wholly-owned subsidiary Southwest Gas, engages in the business of purchasing, distributing, and transporting natural gas for its customers. Southwest Gas is a dynamic energy company committed to exceeding the expectations of its more than two million customers throughout Arizona, Nevada, and California by providing safe and reliable service while innovating sustainable energy solutions to fuel the growth in its communities.

Southwest Gas and its subsidiaries provide regulated natural gas delivery services to customers in portions of Arizona, Nevada, and California to meet heating, cooking, and other household needs in residential communities across these territories, as well as to facilitate the ongoing business operations of commercial and industrial customers. Southwest Gas makes investments in infrastructure to support customer demand associated with population growth and economic development activity, and the safe and reliable operation of its system through adherence to integrity management programs. Public utility rates, practices, facilities, and service territories of Southwest Gas are subject to regulatory oversight. The timing and amount of rate relief can materially impact results of operations. Natural gas purchases and the timing of related recoveries can materially impact liquidity. Results for the natural gas distribution segment are higher during winter periods due to the seasonality incorporated in its regulatory rate structures.

The Company maintains a website (www.swgasholdings.com) for the benefit of stockholders, investors, customers, and other interested parties. Similarly, Southwest Gas maintains a website (www.swgas.com) mainly focused on utility operations. The Company’s annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports are available, free of charge, through the SEC’s website at www.sec.gov and the www.swgasholdings.com website as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. All additional Company SEC filings are also available on the www.swgasholdings.com website. The Corporate Governance Guidelines, Code of Business Conduct and Ethics, and charters of the Nominating and Corporate Governance, Audit, and Compensation Committees of the Board are also available on the www.swgasholdings.com website. Print versions of these documents are available to stockholders upon request directed to the Corporate Secretary, Southwest Gas Holdings, Inc., 8360 S. Durango Drive, Las Vegas, NV 89113. Nothing included on the Company’s website shall be deemed to be incorporated by reference into Form 10-K.