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

Rhea-AI Filing Summary

Comfort Systems USA (FIX) Chief Financial Officer George William III reported option exercises and a concurrent sale on 08/08/2025. He exercised options with strike prices of $36.25 and $42.50 to acquire 2,922 and 5,514 shares respectively, and the filing reports a sale of 8,436 shares at an average price of $692.6014. Following these transactions the reporting person beneficially owns 47,473 shares of common stock and holds 9,000 derivative securities (options) as reported. The form notes option grant and vesting dates and states additional price details are available from the company counsel.

Positive

• CFO exercised options at strike prices of $36.25 and $42.50, acquiring 2,922 and 5,514 shares respectively, as disclosed on the form.
• Filing includes grant and vesting history for the exercised options, providing clear documentation of option provenance and vesting completion.

Negative

• Reported sale of 8,436 shares on the same reporting date reduced beneficial stock holdings to 47,473 shares.
• Full transaction price details beyond the reported average sale price are not included in the form and are available only upon request to company counsel.

Insights

Financial Analyst

TL;DR: CFO exercised options and sold shares; net reported holdings are 47,473 shares and 9,000 options.

The Form 4 shows routine equity compensation activity: exercises of options at stated strike prices of $36.25 (2,922 shares) and $42.50 (5,514 shares) and a reported sale of 8,436 shares at an average price of $692.6014. After these transactions the filing lists beneficial ownership of 47,473 common shares and 9,000 derivative securities. The form includes grant and vesting history for the exercised options, supporting the mechanics of the reported activity.

Corporate Governance Expert

TL;DR: Disclosure is consistent with Section 16 reporting; vesting and exercise details are provided for transparency.

The filing documents option grants (with original grant dates and vesting schedules) and reports resulting share and derivative holdings, which meets Section 16 disclosure objectives. The explanation clarifies that the reported average sale price reflects the shares sold and that further transaction pricing information is available from the company counsel. The form is signed by an attorney-in-fact, indicating the filing was submitted on behalf of the reporting person.

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
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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^*

GEORGE WILLIAM III

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
08/08/2025

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	08/08/2025		M		2,922	A	$36.25	50,395	D
Common Stock	08/08/2025		M		5,514	A	$42.5	55,909	D
Common Stock	08/08/2025		S		8,436	D	$692.6014(1)	47,473	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
Option to Buy	$36.25	08/08/2025		M			2,922	04/01/2020(2)	03/08/2027	Common Stock	2,922	$0	0	D
Option to Buy	$42.5	08/08/2025		M			5,514	04/01/2021(3)	03/07/2028	Common Stock	5,514	$0	9,000	D

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.

2. Stock options were granted on 03/08/2017, vested ratably over a three-year period, and were fully vested on 04/01/2020.

3. Stock options were granted on 03/07/2018, vested ratably over a three-year period, and were fully vested on 04/01/2021.

	/s/ Rachel R. Eslicker, Attorney-in-Fact	08/11/2025
	** 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 did the CFO of Comfort Systems USA (FIX) do on 08/08/2025?

The filing reports exercises of options to acquire 2,922 and 5,514 shares and a sale of 8,436 shares, all reported for 08/08/2025.

How many shares does George William III beneficially own after the transactions (FIX)?

Following the reported transactions the Form 4 lists beneficial ownership of 47,473 common shares.

How many derivative securities (options) does the CFO hold after these transactions?

The filing reports 9,000 derivative securities (options) beneficially owned following the reported transactions.

At what strike prices were the exercised options reported on the FIX Form 4?

The exercised options had strike prices of $36.25 and $42.50 as stated on the form.

What was the reported sale price for the 8,436 shares on the Form 4?

The Form 4 reports an average sale price of $692.6014 for the 8,436 shares sold and notes that full price details are available from the company counsel.