8-K/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K/A

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) August 11, 2025

SOUTHWEST GAS HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware	001-37976	81-3881866
(State or other jurisdiction of<br>incorporation or organization)	(Commission<br> <br>File Number)	(I.R.S. Employer<br>Identification No.)
8360 S. Durango Drive
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Post Office Box 98510
Las Vegas, Nevada
(Address of principal executive offices)

89193-8510

(Zip Code)

Registrant’s telephone number, including area code: (702) 876-7237

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading<br>Symbol	Name of each exchange<br>on which registered
Southwest Gas Holdings, Inc. Common Stock, $1 Par Value	SWX	New York Stock Exchange

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)
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☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
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☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
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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

This Current Report on Form 8-K/A (this “Amendment”) amends the Current Report on Form 8-K of Southwest Gas Holdings, Inc. (the “Company”) filed with the U.S. Securities and Exchange Commission on August 12, 2025 (the “Initial Form 8-K”), which described, among other matters, (i) that, as of August 11, 2025 (the “Closing Date”), the Company owns approximately 30.9% of the total outstanding shares of common stock of Centuri Holdings, Inc. (“Centuri”), par value $0.01 per share (“Centuri Common Stock”), due to the closing of both the Company’s sale of 17,250,000 shares of its holdings of Centuri Common Stock in an underwritten public offering (the “Offering”) and the Company’s sale of 1,573,500 shares of its holdings of Centuri Common Stock in a concurrent private placement (the “Private Placement”) on the Closing Date and (ii) that, as of the Closing Date and as a result of the Offering and the Private Placement, the Company no longer has a controlling financial interest in Centuri and has therefore determined to deconsolidate Centuri’s financial statements and results of operations from its consolidated financial statements effective as of the Closing Date (the “Deconsolidation”).

This Amendment amends and supplements the Initial Form 8-K, which is incorporated herein by reference, to include the unaudited pro forma consolidated balance sheet as of June 30, 2025, giving effect to the Deconsolidation as if it had occurred on June 30, 2025, and unaudited pro forma consolidated statements of operations for the six months ended June 30, 2025 and for the three years ended December 31, 2024, in each case giving effect to the Deconsolidation as if the Deconsolidation had occurred on January 1, 2022, as required by Item 9.01(b) of Form 8-K in connection with the Deconsolidation. No other amendments to the Initial Form 8-K are being made by this Amendment.

Item 9.01	Financial Statements and Exhibits.

(b) Pro Forma Financial Information.

In accordance with Item 9.01(b) of Form 8-K, the unaudited pro forma combined financial statements of the Company, which reflect the Deconsolidation, are attached to this Amendment as Exhibit 99.1 and are incorporated herein by reference.

(d) Exhibits.

Exhibit<br> <br>No.	Description
99.1	Unaudited Pro Forma Condensed Consolidated Financial Information.
104	Cover Page formatted in Inline XBRL

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.
August 15, 2025	/s/ Catherine M. Mazzeo
	Catherine M. Mazzeo
	Senior Vice President/Chief Legal, Safety & Compliance Officer and Corporate Secretary

EX-99.1

Exhibit 99.1

SOUTHWEST GAS HOLDINGS, INC.

UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

On April 22, 2024, Centuri Holdings, Inc. (“Centuri”), completed its initial public offering (the “Centuri IPO”), prior to which Centuri was a wholly owned subsidiary of the Southwest Gas Holdings, Inc. (“Southwest Gas Holdings” or the “Company”). Immediately upon the completion of the Centuri IPO, the Company continued to own approximately 81% of the outstanding shares of common stock of Centuri, par value $0.01 per share (“Centuri Common Stock”), and the Company disclosed its intent to dispose of its ownership in Centuri in one or more disposition transactions. Since the Centuri IPO and through August 11, 2025 (the “Closing Date”), the Company sold portions of its interests in Centuri through secondary public offerings and concurrent private placements and, on the Closing Date, the Company completed the sale of an aggregate of 18,823,500 shares of its holdings of Centuri Common Stock in a secondary public offering (the “Offering”) and concurrent private placement (the “Private Placement” and collectively with the Offering, the “Transactions”). As a result of the Transactions, the Company owns 27,362,210 shares of Centuri Common Stock, or approximately 30.9% of the total outstanding shares of Centuri Common Stock and, therefore, no longer has a controlling financial interest in Centuri.

The following unaudited pro forma condensed consolidated financial statements reflect the determination by the Company to deconsolidate Centuri’s financial statements and results of operations from its consolidated financial statements as a result of the disposition of the Company’s controlling financial interest in Centuri effective as of the Closing Date (the “Deconsolidation”) and the receipt of the net proceeds from the Transactions. The unaudited pro forma condensed consolidated balance sheet as of June 30, 2025 is presented as if the Transactions and the Deconsolidation occurred on June 30, 2025. The unaudited pro forma condensed consolidated statements of income for the six months ended June 30, 2025 and for the years ended December 31, 2024, 2023 and 2022 are presented as if the Deconsolidation had occurred on January 1, 2022 and exclude results from discontinued operations.

The unaudited pro forma condensed consolidated financial statements were prepared in accordance with Article 11 of Regulation S-X. The unaudited pro forma condensed consolidated financial statements are based on information currently available including certain assumptions and estimates that management believes are reasonable. They are intended for informational purposes only, and do not purport to represent what the Company’s financial position and results of operations would have been had the Transactions and the Deconsolidation occurred on the dates indicated, or to project the Company’s financial position or results of operations for any future date or period.

The unaudited pro forma condensed consolidated financial statements should be read in conjunction with the historical consolidated financial statements and accompanying notes included in the unaudited condensed consolidated financial statements of Southwest Gas Holdings as of and for the six months ended June 30, 2025, contained in the Form 10-Q filed on August 6, 2025, and the audited consolidated financial statements of Southwest Gas Holdings as of December 31, 2024 and for the three years then ended, contained in the Form 10-K filed on February 26, 2025.

SOUTHWEST GAS HOLDINGS, INC.

Unaudited Pro Forma Condensed Consolidated Balance Sheet

As of June 30, 2025

(in millions)

	Historical<br>Southwest GasHoldings, Inc.				Pro Forma Adjustments (Note 2)									Pro Forma<br>Southwest GasHoldings, Inc.
				HistoricalCenturi				Adjustments			Transactions
ASSETS
Utility plant:
Gas plant	$	11,132.2			$	—			$	—		$	—	$	11,132.2
Less: accumulated depreciation		(2,984.1	)			—				—			—		(2,984.1	)
Construction work in progress		201.2				—				—			—		201.2
Net utility plant		8,349.3				—				—			—		8,349.3
Investment in Centuri		—				—				509.4			24.2		533.6
Other property and investments		1,169.4				(999.8	)			—			—		169.6
Current assets:
Cash and cash equivalents		355.6				(28.3	)			—			353.9		681.2
Accounts receivable, net of allowances		705.3				(570.6	)			—			—		134.7
Accrued utility revenue		50.5				—				—			—		50.5
Income taxes receivable, net		6.2				(6.2	)			—			—		—
Materials, supplies and gas inventories		90.8				—				—			—		90.8
Prepaids and other current assets		216.5				(50.0	)			—			—		166.5
Total current assets		1,424.9				(655.1	)			—			353.9		1,123.7
Noncurrent assets:
Goodwill		786.5				(775.3	)			—			—		11.2
Deferred charges and other assets		483.8				(83.1	)			—			—		400.7
Total noncurrent assets		1,270.3				(858.4	)			—			—		411.9
Total assets	$	12,213.9			$	(2,513.3	)		$	509.4		$	378.1	$	10,588.1
CAPITALIZATION AND LIABILITIES
Capitalization:
Common stock	$	73.6			$	—			$	—		$	—	$	73.6
Additional paid-in capital		2,872.7				(585.1	)			506.8			—		2,794.4
Accumulated other comprehensive loss, net		(41.4	)			3.5				—			—		(37.9	)
Retained earnings (accumulated deficit)		769.7				72.2				—			287.4		1,129.3
Total equity attributable to Southwest Gas Holdings, Inc. stockholders		3,674.6				(509.4	)			506.8			287.4		3,959.4
Noncontrolling interests		441.1				(441.1	)			—			—		—
Total equity		4,115.7				(950.5	)			506.8			287.4		3,959.4
Redeemable noncontrolling interest		7.7				(7.7	)			—			—		—
Long-term debt, less current maturities		4,396.9				(890.6	)			—			—		3,959.4
Total capitalization		8,520.3				(1,848.8	)			506.8			287.4		7,465.7
Current liabilities:
Current maturities of long-term debt		28.1				(28.1	)			—			—		—
Notes payable		260.0				—				—			—		260.0
Accounts payable		254.6				(140.9	)			—			—		113.7
Customer deposits		67.1				—				—			—		67.1
Income taxes payable, net		3.9				—				—			10.8		14.7
Accrued general taxes		50.7				—				—			—		50.7
Accrued interest		40.2				(4.9	)			—			—		35.3
Deferred purchased gas costs		349.0				—				—			—		349.0
Other current liabilities		360.9				(205.6	)			—			—		155.3
Total current liabilities		1,414.5				(379.5	)			—			10.8		1,045.8
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net		927.5				(113.7	)			2.6			79.9		896.3
Accumulated removal costs		486.0				—				—			—		486.0
Other deferred credits		865.6				(171.3	)			—			—		694.3
Total deferred income taxes and other		2,279.1				(285.0	)			2.6			79.9		2,076.6
Total capitalization and liabilities	$	12,213.9			$	(2,513.3	)		$	509.4		$	378.1	$	10,588.1

See accompanying notes to the unaudited pro forma condensed consolidated financial statements

SOUTHWEST GAS HOLDINGS, INC.

Unaudited Pro Forma Condensed Consolidated Statement of Income

For the six months ended June 30, 2025

(in millions, except per share amounts)

	Historical<br>Southwest GasHoldings, Inc.				Pro Forma Adjustments (Note 2)							Pro Forma<br>Southwest GasHoldings, Inc.
				HistoricalCenturi				Adjustments
Operating revenues:
Regulated operations revenues	$	1,142.7			$	—			$	—		$	1,142.7
Utility infrastructure services revenues		1,274.1				(1,274.1	)			—			—
Total operating revenues		2,416.8				(1,274.1	)			—			1,142.7
Operating expenses:
Net cost of gas sold		386.7				—				—			386.7
Operations and maintenance		269.9				—				(1.8	)		268.1
Depreciation and amortization		231.1				(68.4	)			—			162.7
Taxes other than income taxes		46.9				—				—			46.9
Utility infrastructure services expenses		1,186.2				(1,186.2	)			—			—
Total operating expenses		2,120.8				(1,254.6	)			(1.8	)		864.4
Operating income		296.0				(19.5	)			1.8			278.3
Other income and (expenses):
Net interest deductions		(143.9	)			36.1				—			(107.8	)
Other income (deductions), net		27.1				0.1				—			27.2
Total other income and (expenses)		(116.8	)			36.2				—			(80.6	)
Income (loss) before income taxes		179.2				16.7				1.8			197.7
Income tax expense (benefit)		80.2				0.5				(45.0	)		35.7
Net income from continuing operations		99.0				16.2				46.8			162.0
Net income attributable to noncontrolling interest		(2.1	)			2.1				—			—
Net income from continuing operations attributable to Southwest Gas Holdings, Inc.	$	101.1			$	14.1			$	46.8		$	162.0
Earnings from continuing operations per share attributable to Southwest Gas Holdings,<br>Inc.:
Basic	$	1.40										$	2.25
Diluted	$	1.40										$	2.24
Weighted average shares:
Basic		72.1											72.1
Diluted		72.2											72.2

See accompanying notes to the unaudited pro forma condensed consolidated financial statements

SOUTHWEST GAS HOLDINGS, INC.

Unaudited Pro Forma Condensed Consolidated Statement of Income

For the year ended December 31, 2024

(in millions, except per share amounts)

	Historical<br>Southwest GasHoldings, Inc.				Pro Forma Adjustments (Note 2)							Pro Forma<br>Southwest GasHoldings, Inc.
				HistoricalCenturi				Adjustments
Operating revenues:
Regulated operations revenues	$	2,475.2			$	—			$	—		$	2,475.2
Utility infrastructure services revenues		2,637.2				(2,637.2	)			—			—
Total operating revenues		5,112.4				(2,637.2	)			—			2,475.2
Operating expenses:
Net cost of gas sold		1,150.0				—				—			1,150.0
Operations and maintenance		536.2				—				(7.8	)		528.4
Depreciation and amortization		438.4				(135.3	)			—			303.1
Taxes other than income taxes		89.0				—				—			89.0
Utility infrastructure services expenses		2,415.1				(2,415.1	)			—			—
Total operating expenses		4,628.7				(2,550.4	)			(7.8	)		2,070.5
Operating income		483.7				(86.8	)			7.8			404.7
Other income and (expenses):
Net interest deductions		(297.0	)			90.5				—			(206.5	)
Other income (deductions), net		54.6				(0.4	)			—			54.2
Total other income and (expenses)		(242.4	)			90.1				—			(152.3	)
Income before income taxes		241.3				3.3				7.8			252.4
Income tax expense		36.5				(3.7	)			1.9			34.7
Net income from continuing operations		204.8				7.0				5.9			217.7
Net income attributable to noncontrolling interest		6.0				(6.0	)			—			—
Net income from continuing operations attributable to Southwest Gas Holdings, Inc.	$	198.8			$	13.0			$	5.9		$	217.7
Earnings from continuing operations per share attributable to Southwest Gas Holdings,<br>Inc.:
Basic	$	2.77										$	3.03
Diluted	$	2.76										$	3.02
Weighted average shares:
Basic		71.8											71.8
Diluted		72.0											72.0

See accompanying notes to the unaudited pro forma condensed consolidated financial statements

SOUTHWEST GAS HOLDINGS, INC.

Unaudited Pro Forma Condensed Consolidated Statement of Income

For the year ended December 31, 2023

(in millions, except per share amounts)

	Historical<br>Southwest GasHoldings, Inc.				Pro Forma Adjustments (Note 2)							Pro Forma<br>Southwest GasHoldings, Inc.
				HistoricalCenturi				Adjustments
Operating revenues:
Regulated operations revenues	$	2,534.7			$	—			$	—		$	2,534.7
Utility infrastructure services revenues		2,899.3				(2,899.3	)			—			—
Total operating revenues		5,434.0				(2,899.3	)			—			2,534.7
Operating expenses:
Net cost of gas sold		1,253.3				—				—			1,253.3
Operations and maintenance		544.1				—				(9.8	)		534.3
Depreciation and amortization		440.9				(145.5	)			—			295.4
Taxes other than income taxes		88.8				—				—			88.8
Utility infrastructure services expenses		2,617.4				(2,617.4	)			—			—
Goodwill impairment and loss on sale		71.2				—				—			71.2
Total operating expenses		5,015.7				(2,762.9	)			(9.8	)		2,243.0
Operating income		418.3				(136.4	)			9.8			291.7
Other income and (expenses):
Net interest deductions		(292.3	)			97.5				—			(194.8	)
Other income (deductions), net		71.3				(0.1	)			—			71.2
Total other income and (expenses)		(221.0	)			97.4				—			(123.6	)
Income before income taxes		197.3				(39.0	)			9.8			168.1
Income tax expense		41.8				(14.7	)			2.4			29.5
Net income from continuing operations		155.5				(24.3	)			7.4			138.6
Net income attributable to noncontrolling interest		4.6				(4.6	)			—			—
Net income from continuing operations attributable to Southwest Gas Holdings, Inc.	$	150.9			$	(19.7	)		$	7.4			138.6
Earnings from continuing operations per share attributable to Southwest Gas Holdings,<br>Inc.:
Basic	$	2.13										$	1.96
Diluted	$	2.13										$	1.95
Weighted average shares:
Basic		70.8											70.8
Diluted		71.0											71.0

See accompanying notes to the unaudited pro forma condensed consolidated financial statements

SOUTHWEST GAS HOLDINGS, INC.

Unaudited Pro Forma Condensed Consolidated Statement of Income

For the year ended December 31, 2022

(in millions, except per share amounts)

	Historical<br>Southwest GasHoldings, Inc.				Pro Forma Adjustments (Note 2)							Pro Forma<br>Southwest GasHoldings, Inc.
				HistoricalCenturi				Adjustments
Operating revenues:
Regulated operations revenues	$	2,199.7			$	—			$	—		$	2,199.7
Utility infrastructure services revenues		2,760.3				(2,760.3	)			—			—
Total operating revenues		4,960.0				(2,760.3	)			—			2,199.7
Operating expenses:
Net cost of gas sold		799.1				—				—			799.1
Operations and maintenance		636.8				—				1.6			638.4
Depreciation and amortization		470.5				(155.4	)			—			315.1
Taxes other than income taxes		93.4				—				—			93.3
Utility infrastructure services expenses		2,529.3				(2,529.3	)			—			—
Goodwill impairment and loss on sale		455.4				—				—			455.4
Total operating expenses		4,984.5				(2,684.7	)			1.6			2,301.3
Operating (loss) income		(24.5	)			(75.6	)			(1.6	)		(101.6	)
Other income and (expenses):
Net interest deductions		(242.8	)			61.4				—			(181.4	)
Other income (deductions), net		(6.2	)			0.9				—			(5.3	)
Total other income and (expenses)		(249.0	)			62.3				—			(186.7	)
(Loss) income before income taxes		(273.5	)			(13.3	)			(1.6	)		(288.3	)
Income tax (benefit) expense		(75.7	)			(5.7	)			(0.4	)		(81.8	)
Net (loss) income from continuing operations		(197.8	)			(7.6	)			(1.2	)		(206.5	)
Net (loss) income attributable to noncontrolling interest		5.6				(5.6	)			—			—
Net (loss) income from continuing operations attributable to Southwest Gas Holdings, Inc.	$	(203.4	)		$	(2.0	)		$	(1.2	)		(206.5	)
(Loss) earnings from continuing operations per share attributable to Southwest Gas Holdings,<br>Inc.:
Basic	$	(3.10	)										(3.15	)
Diluted	$	(3.10	)										(3.15	)
Weighted average shares:
Basic		65.6											65.6
Diluted		65.6											65.6

See accompanying notes to the unaudited pro forma condensed consolidated financial statements

Notes to Unaudited Pro Forma Condensed Consolidated Financial Statements

Note 1: Basis of Presentation

On the Closing Date, the Company completed the sale of approximately 18.8 million shares of Centuri Common Stock in the Transactions and received net proceeds of approximately $353.9 million, after deducting underwriting discounts and estimated offering expenses. As a result of the Transactions, the Company no longer owns a controlling financial interest in Centuri. Accordingly, the Company’s remaining ownership of approximately 30.9% of Centuri Common Stock will be accounted for as an equity method investment.

The disposition of Centuri meets the criteria for presentation as a discontinued operation under accounting principles generally accepted in the United States of America. Beginning in the third quarter ending September 30, 2025, Centuri’s historical and subsequent financial results will be reported as discontinued operations in the Company’s consolidated financial statements. Additionally, the Company’s remaining equity method investment in Centuri will be classified as held-for-sale.

Note 2: Pro Forma Adjustments

The Historical Centuri amounts reflect the reversal of the historical assets and liabilities and results of operations of Centuri that will no longer be reflected in the Company’s continuing operations financial statements. In addition, the pro forma financial statements also reflect the following adjustments:

Pro Forma Balance Sheet

•	$509.4 million represents our historical book basis in Centuri that was previously eliminated in<br>consolidation.
•	$24.2 million reflects a step up to fair value of our remaining interest in Centuri offset by our sale of<br>ownership interest in Centuri.
---	---
•	The two items described above result in Centuri being presented at fair value as an equity investment.<br>
---	---

Pro Forma Income Statements

•	$45.0 million primarily related to outside basis recognized due to the tax deconsolidation of Centuri during<br>the second quarter of 2025.
•	$1.8 million, $8.2 million and $11.1 million of separation-related costs primarily to advisory,<br>legal, accounting, which were incurred and are included in the Company’s historical statements of income for the six months ended June 30, 2025 and the years ended December 31, 2024 and 2023, respectively. Partially offset by the<br>reversal of cost allocations of $0.4 million, $1.3 million, and $1.6 million in the Company’s historical statements of income for the years ended December 31, 2024, 2023 and 2022, respectively.
---	---

The unaudited pro forma condensed consolidated financial statements reflect the following tax adjustments, which were determined using a statutory tax rate of 24% and may differ from the Company’s actual presentation of its continuing operations after the Deconsolidation:

•	The contribution of certain deferred tax assets to Centuri in accordance with the Tax Assets Agreement,<br>
•	The establishment of a deferred tax liability related to the book and tax basis difference in the Company’s<br>retained interest in Centuri and
---	---
•	The pro forma income tax impact of the Transactions and Deconsolidation adjustments.
---	---

The Transactions and related Deconsolidation result in a pro forma one-time gain to Southwest Gas Holdings calculated as follows (in millions):

Fair value of the retained investment in Centuri	$	533.6
Net proceeds received from the Transactions		353.9
Carrying value of noncontrolling interest attributable to Centuri prior to Deconsolidation ^(a)^		448.8
Less: Carrying value of Centuri net assets prior to Deconsolidation		(958.2	)
Pro forma pre-tax net gain		378.1
Estimated pro forma income tax expense		90.7
Estimated pro forma net gain	$	287.4
(a)	Includes Centuri’s historical redeemable noncontrolling interest.
---	---

This estimated gain will be reflected in discontinued operations in the Company’s consolidated statements of income beginning in the third quarter ending September 30, 2025 and has not been reflected on the unaudited pro forma condensed consolidated statements of income. The amount of the actual gain will be calculated based on the net proceeds received from the Transactions and the Company’s carrying value in Centuri on the Closing Date and therefore could differ from the pro forma estimate.

The actual gain recognized upon Deconsolidation as well as changes in the fair value of the Company’s investment in Centuri will be reflected in discontinued operations because such amounts do not have a continuing impact on the Company’s consolidated results.