Amendment No. 13 to Schedule 13D for Southwest Gas Holdings, Inc.

This filing represents Amendment No. 13 to the Schedule 13D for Southwest Gas Holdings, Inc., originally filed on June 3, 2022. The amendment includes an Amended and Restated Cooperation Agreement dated October 14, 2025, between the Issuer, the Reporting Persons, and Andrew J. Teno. The agreement allows the Reporting Persons to continue designating up to four individuals to serve on the Board of the Issuer, including Andrew W. Evans, Henry Linginfelter, Ruby Sharma, and Andrew Teno. The Issuer has agreed to nominate these individuals for election at the 2026 Annual Meeting. The standstill restrictions on the Reporting Persons will remain in effect until the later of the completion of the 2026 Annual Meeting or the earlier of Mr. Teno no longer serving as a director or thirty days prior to the advance notice deadline for the 2027 annual meeting. The agreement also sets the record date for the 2026 Annual Meeting within thirty days of March 3, 2026.