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

Rhea-AI Filing Summary

Insider sale by director Herman E. Bulls: The filing shows that Herman E. Bulls, a director of Comfort Systems USA, Inc. (FIX), sold 3,000 shares of Common Stock on 08/27/2025 at an average price of $710 per share. After the sale, Mr. Bulls is reported to beneficially own 32,574 shares directly.

The form is a routine Section 16 disclosure showing a single non-derivative sale processed under a reported transaction code S. The explanatory note states the $710 figure is the average price and that full transaction pricing details are available from the companys Office of the General Counsel.

Positive

• Complete disclosure of key sale details: reporting person, transaction date, shares sold, average price, and post-sale ownership are provided
• Post-transaction beneficial ownership disclosed: 32,574 shares remain beneficially owned, giving transparency to remaining insider stake

Negative

• Limited pricing detail in form: only an average price ($710) is provided with a note that full pricing per-share details require a request
• Single insider sale reported: while routine, any insider sale could be viewed negatively by some investors depending on context

Insights

Financial Analyst

TL;DR: A director sold a modest stake; transaction size and post-sale holdings are disclosed, suggesting routine liquidity rather than material corporate change.

The 3,000-share sale by a director represents a specific, disclosed reduction in insider holdings with clear post-transaction beneficial ownership of 32,574 shares. The reported average price of $710 per share provides immediate valuation context for the disposition. This Form 4 reports a common non-derivative sale and uses transaction code S, consistent with an ordinary sale. For investors, the filing documents insider trading activity but does not by itself indicate a change in company operations, governance, or financial condition.

Corporate Governance Expert

TL;DR: Disclosure is complete for a single director sale; filing fulfills Section 16 requirements and raises no governance red flags.

The report identifies the reporting person, relationship (Director), transaction date, number of shares sold, reported average price, and post-transaction ownership, meeting standard disclosure expectations. The explanatory note clarifies that the $710 figure is an average and that more granular pricing/time details can be obtained from corporate counsel. No multiple transactions, pledges, or derivative activity are reported. From a governance perspective, this appears to be a routine liquidity event rather than a signal of material corporate developments.

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^*

BULLS HERMAN E

(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)
08/27/2025

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	08/27/2025		S		3,000	D	$710(1)	32,574	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	08/28/2025
	** 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 Comfort Systems USA (FIX) director Herman E. Bulls report on Form 4?

The Form 4 reports that director Herman E. Bulls sold 3,000 shares of Comfort Systems USA common stock on 08/27/2025.

At what price were the shares sold according to the Form 4 for FIX?

The filing lists an average price of $710 per share and notes that this is an average and that full per-share pricing details can be requested from the company's counsel.

How many FIX shares does Herman E. Bulls beneficially own after the sale?

After the reported sale, Mr. Bulls is shown to beneficially own 32,574 shares directly.

Does the Form 4 indicate any derivative transactions or other complex activity for FIX?

No. Table II (derivative securities) contains no reported transactions; the filing shows only a non-derivative sale of common stock.

Who signed the Form 4 for the reported FIX transaction?

The Form 4 was signed by Rachel R. Eslicker, Attorney-in-Fact on 08/28/2025.