[Form 4] Comfort Systems USA, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Comfort Systems USA director Pablo G. Mercado reported a sale of 1,078 shares of common stock on 08/22/2025 at an average price of $695.88 per share. After the transaction he beneficially owns 6,500 shares, held directly. The Form 4 was signed by an attorney-in-fact on 08/25/2025. The filing identifies the director relationship and indicates this is a single reporting person filing.

Positive

• None.

Negative

• Director sold 1,078 shares of Comfort Systems USA at an average price of $695.88, reducing direct holdings to 6,500 shares

Insights

Financial Analyst

TL;DR: Insiders sold a small number of shares relative to reported holdings; no derivative activity disclosed.

The filing shows a routine sale of 1,078 shares at an average price of $695.88, leaving 6,500 shares beneficially owned directly by the reporting director. There are no derivative transactions reported. This disclosure provides transparency on insider liquidity but contains no operational or financial performance metrics to change a valuation model.

Corporate Governance Expert

TL;DR: Routine insider sale document; compliance with Section 16 reporting observed.

The Form 4 lists the reporting person as a director and indicates the form was filed by one reporting person. The execution and signature by an attorney-in-fact are included. The filing meets disclosure requirements by reporting the sale, the resulting direct ownership, and providing an explanatory note about the reported average price.

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Mercado, Pablo G.

(Last) (First) (Middle)

C/O COMFORT SYSTEMS USA, INC.

675 BERING DRIVE, SUITE 400

(Street)

HOUSTON TX 77057

(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)
08/22/2025

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	08/22/2025		S		1,078	D	$695.88(1)	6,500	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. Represents the average price of shares sold; full information regarding the number of shares sold and specific prices will be made available upon request to the Company's Office of the General Counsel.

	/s/ Rachel R. Eslicker, Attorney-in-Fact	08/25/2025
	** 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 transaction did Comfort Systems USA (FIX) director Pablo G. Mercado report?

He reported a sale of 1,078 shares of common stock on 08/22/2025 at an average price of $695.88 per share.

How many Comfort Systems USA shares does Pablo G. Mercado beneficially own after the reported trade?

Following the reported transaction he beneficially owns 6,500 shares, held directly.

Was any derivative activity reported on this Form 4 for FIX?

No derivative securities (options, warrants, or convertible instruments) are reported on the Form 4.

Who signed the Form 4 and when was it signed?

The Form 4 was signed by Rachel R. Eslicker, Attorney-in-Fact on 08/25/2025.

Does the filing indicate the reporting person’s relationship to the issuer?

Yes, the filing identifies Pablo G. Mercado as a Director of Comfort Systems USA.