SWX

swx-202602250001692115false00016921152026-02-252026-02-25

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) February 25, 2026

SOUTHWEST GAS HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3797681-3881866 (State or other jurisdiction of incorporation or organization)  (Commission File Number) (I.R.S. Employer Identification No.)

8360 S. Durango Drive Post Office Box 98510 Las Vegas, Nevada         89193-8510 (Address of principal executive offices)          (Zip Code)

Registrant's telephone number, including area code: (702) 876‑7237

Securities registered pursuant to Section 12(b) of the Act: Southwest Gas Holdings, Inc.: Title of each classTrading SymbolName of each exchange on which registered Southwest Gas Holdings, Inc. Common Stock, $1 Par ValueSWXNew York Stock Exchange Southwest Gas Corporation: None.

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).     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. ☐

Item 2.02        Results of Operations and Financial Condition.

On February 25, 2026, Southwest Gas Holdings, Inc. released summary financial information to the general public, including the investment community, regarding operating performance for the quarter and twelve months ended December 31, 2025. A copy of the associated press release and summary financial information is attached hereto as Exhibit 99.

This Form 8-K and the attached exhibit are provided under Item 2.02 of Form 8-K and are furnished to, but not filed with, the Securities and Exchange Commission.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits:

99  Press Release and summary financial information dated February 25, 2026.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

SOUTHWEST GAS HOLDINGS, INC.

February 25, 2026/s/ Justin S. Forsberg Justin S. Forsberg Senior Vice President/Chief Financial Officer and Treasurer

EXHIBIT INDEX

Exhibit No.Description 99Press Release and summary financial information dated February 25, 2026.

swx-202601090001692115false00016921152026-01-092026-01-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) January 9, 2026

SOUTHWEST GAS HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3797681-3881866 (State or other jurisdiction of incorporation or organization)  (Commission File Number) (I.R.S. Employer Identification No.)

8360 S. Durango Drive Post Office Box 98510 Las Vegas, Nevada         89193-8510 (Address of principal executive offices)          (Zip Code)

Registrant's telephone number, including area code: (702) 876‑7237

Securities registered pursuant to Section 12(b) of the Act: Southwest Gas Holdings, Inc.: Title of each classTrading SymbolName of each exchange on which registered Southwest Gas Holdings, Inc. Common Stock, $1 Par ValueSWXNew York Stock Exchange Southwest Gas Corporation: None.

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).     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. ☐

Explanatory Note Southwest Gas Holdings, Inc. (“Southwest Gas Holdings” or the “Company”) is filing this Current Report on Form 8-K to report the Audit Committee of the Board of Directors of the Company’s (the “Audit Committee’s”) conclusion that the Company’s unaudited Condensed Consolidated Financial Statements as of June 30, 2025 and September 30, 2025, and for the three and six months ended June 30, 2025 and three and nine months ended September 30, 2025 (collectively, the “Restated Periods”) should no longer be relied upon, as discussed further below. In connection with the preparation of the Company’s upcoming Annual Report on Form 10-K for the year ended December 31, 2025 (the “2025 Form 10-K”), management identified errors related to the estimated deferred income tax liabilities for state income taxes. The errors do not impact the Company’s previously communicated guidance metrics. The Company reaffirms its guidance for 2025 net income as well as the expected compound annual growth rates (“CAGR”) for Southwest Gas Corporation net income and rate base for the 2025-2029 period.1 The Company does not expect any impact on previously reported operating margin, cash flows, credit metrics, historical state income tax returns, cash income taxes paid, nor compliance with debt covenants for any previous interim periods or years related to these errors. The Company expects that there will be a de minimis effect on annual cash income tax payments in future years. The issues result from not timely updating estimated apportionment rates to reflect certain events. For Southwest Gas Corporation, the errors date back to the formation of Southwest Gas Holdings in 2017, when Southwest Gas Corporation and Centuri Holdings, Inc. (“Centuri”) became wholly-owned subsidiaries of Southwest Gas Holdings. These errors were determined to be not material to any previously issued Southwest Gas Corporation financial statements. Although these financial statements can still be relied upon, Southwest Gas Corporation plans to revise the historical financial statements due to the cumulative effect of correcting the deferred income tax error in the 2025 Form 10-K. For the Company, the errors arose following the Company’s sale of shares of Centuri’s common stock in the second and third quarters of 2025, which resulted in the tax deconsolidation of Centuri, as discussed further in Item 4.02 below. Item 2.02 Results of Operations and Financial Condition The information appearing below under Item 4.02 specifically regarding the Company’s previously reported interim periods ended June 30, 2025, and September 30, 2025, as well as under Item 7.01 regarding preliminary results and guidance are incorporated herein by reference. The information incorporated by reference into this Item 2.02 is intended to be furnished under Item 2.02 and shall not be deemed “filed” for

swx-202511050001692115false00016921152025-11-052025-11-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) November 5, 2025

SOUTHWEST GAS HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3797681-3881866 (State or other jurisdiction of incorporation or organization)  (Commission File Number) (I.R.S. Employer Identification No.)

8360 S. Durango Drive Post Office Box 98510 Las Vegas, Nevada         89193-8510 (Address of principal executive offices)          (Zip Code)

Registrant's telephone number, including area code: (702) 876‑7237

Securities registered pursuant to Section 12(b) of the Act: Southwest Gas Holdings, Inc.: Title of each classTrading SymbolName of each exchange on which registered Southwest Gas Holdings, Inc. Common Stock, $1 Par ValueSWXNew York Stock Exchange Southwest Gas Corporation: None.

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).     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. ☐

Item 2.02        Results of Operations and Financial Condition.

On November 5, 2025, Southwest Gas Holdings, Inc. released summary financial information to the general public, including the investment community, regarding operating performance for the quarter and nine months ended September 30, 2025. A copy of the associated press release and summary financial information is attached hereto as Exhibit 99.

This Form 8-K and the attached exhibit are provided under Item 2.02 of Form 8-K and are furnished to, but not filed with, the Securities and Exchange Commission.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits:

99  Press Release and summary financial information dated November 5, 2025.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

SOUTHWEST GAS HOLDINGS, INC.

November 5, 2025/s/ Robert J. Stefani Robert J. Stefani Senior Vice President/Chief Financial Officer

EXHIBIT INDEX

Exhibit No.Description 99Press Release and summary financial information dated November 5, 2025.