[Form 4] COMFORT SYSTEMS USA INC Insider Trading Activity

Rhea-AI Filing Summary

Comfort Systems USA, Inc. (FIX)11/14/2025 in a transaction coded "G," which indicates a bona fide gift. The shares were contributed at a stated price of $0 as a charitable donation to a donor-advised fund.

After this gift, the reporting person beneficially owns 29,774 shares of Comfort Systems USA common stock in direct ownership. The filing reflects an individual reporting person, serving as a director of the company, with no derivative securities reported.

11/19/2025 - 05:00 PM

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

OMB APPROVAL

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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^*

BULLS HERMAN E

(Last) (First) (Middle)

C/O COMFORT SYSTEMS USA, INC.

9753 KATY FREEWAY, SUITE 700

(Street)

HOUSTON TX 77024

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
COMFORT SYSTEMS USA INC [ FIX ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

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	11/14/2025		G(1)		800	D	$0	29,774	D

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. This transaction represents a contribution of common stock to a charitable donor advised fund.

	/s/ Rachel R. Eslicker, Attorney-in-Fact	11/19/2025
	** 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 insider transaction did Comfort Systems USA (FIX) report on this Form 4?

A director of Comfort Systems USA, Inc. (FIX) reported a transaction coded "G" showing a bona fide gift of 800 shares of common stock on 11/14/2025.

How many Comfort Systems USA (FIX) shares were donated and at what price?

The director donated 800 shares of Comfort Systems USA common stock at a stated price of $0, consistent with a charitable gift.

What is the director’s remaining ownership in Comfort Systems USA (FIX) after the gift?

Following the reported gift, the director beneficially owns 29,774 shares of Comfort Systems USA common stock in direct ownership.

What does transaction code "G" mean in this Comfort Systems USA (FIX) Form 4?

Transaction code "G" on Form 4 indicates a bona fide gift of securities, in this case 800 shares of Comfort Systems USA common stock.

Was this Comfort Systems USA (FIX) Form 4 filed by one or multiple reporting persons?

The Form 4 was filed by one reporting person, who is identified as a director of Comfort Systems USA, Inc.

What is the purpose of the gifted Comfort Systems USA (FIX) shares?

The explanation states that the transaction represents a contribution of common stock to a charitable donor advised fund.