Southwest Gas (SWX) SVP Mazzeo updates stock and 401(k) holdings

Rhea-AI Filing Summary

Southwest Gas Holdings executive Catherine M. Mazzeo reported an equity transaction involving company common stock. On January 8, 2026, a transaction coded "F" covered 737.424 shares of Southwest Gas Holdings common stock at $80.15 per share, leaving her with 10,496.228 shares held directly.

She also reported an additional 745.839 shares held indirectly through a 401(k) plan. The reported direct balance includes 348.695 shares and the 401(k) balance includes 23.484 shares that were acquired through exempt dividend reinvestment transactions.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mazzeo Catherine M

(Last) (First) (Middle)

8360 S DURANGO DR

(Street)

LAS VEGAS NV 89113

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Southwest Gas Holdings, Inc. [ SWX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP/Chief Legal/Comp. Officer

3. Date of Earliest Transaction (Month/Day/Year)
01/08/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/08/2026		F		737.424	D	$80.15	10,496.228(1)	D
Common Stock								745.839(2)	I	By 401(k)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Balance includes 348.695 shares acquired through exempt dividend reinvestment transactions.

2. Balance includes 23.484 shares acquired through exempt dividend reinvestment transactions.

Remarks:

	Catherine M. Mazzeo	01/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Southwest Gas (SWX) executive Catherine M. Mazzeo report in this Form 4?

Catherine M. Mazzeo, SVP/Chief Legal/Compensation Officer of Southwest Gas Holdings, Inc., reported a transaction coded "F" on January 8, 2026 involving 737.424 shares of the company’s common stock at $80.15 per share, along with her updated direct and indirect share holdings.

How many Southwest Gas (SWX) shares does Catherine M. Mazzeo own after the reported transaction?

Following the reported transaction, Catherine M. Mazzeo beneficially owns 10,496.228 shares of Southwest Gas common stock directly and 745.839 shares indirectly through a 401(k) plan.

What does the transaction code "F" mean in Catherine M. Mazzeo’s Southwest Gas Form 4?

The Form 4 lists the transaction code "F" for the January 8, 2026 common stock transaction. The code is taken directly from the form’s transaction table; the filing does not provide a narrative description of the code within the excerpt.

How are Catherine M. Mazzeo’s Southwest Gas (SWX) holdings split between direct and indirect ownership?

According to the filing, she holds 10,496.228 shares of Southwest Gas common stock as direct ownership, and an additional 745.839 shares as indirect ownership through a 401(k) plan.

What do the dividend reinvestment footnotes in Catherine M. Mazzeo’s Form 4 for Southwest Gas indicate?

The footnotes state that her direct balance includes 348.695 shares and her 401(k) balance includes 23.484 shares that were acquired through exempt dividend reinvestment transactions.

What is Catherine M. Mazzeo’s role at Southwest Gas Holdings (SWX)?

The filing identifies Catherine M. Mazzeo as an officer of Southwest Gas Holdings, Inc., serving as SVP/Chief Legal/Compensation Officer.