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Comfort Systems USA (FIX) filed a notice of proposed sale of common stock under Rule 144.
The filing covers the planned sale of 1,000 shares of common stock through broker Stifel Nicolaus & Company Inc. on the NYSE, with an aggregate market value of 996000.00. The filing lists total common shares outstanding as 35,271,950, which is a baseline figure, not the amount being sold.
The seller acquired these shares as company stock compensation, including 879 shares on 04/09/2024 and 121 shares on 03/27/2024, both from the issuer. The person for whose account the securities are to be sold represents that they are not aware of any undisclosed material adverse information about the issuer’s current or prospective operations.
BlackRock, Inc. has filed an amended Schedule 13G reporting its beneficial ownership of common stock of Comfort Systems USA, Inc. as of 11/30/2025. BlackRock reports beneficial ownership of 3,803,901 shares of common stock, representing 10.8% of the outstanding class. It has sole power to vote 3,606,513 shares and sole power to dispose of 3,803,901 shares, with no shared voting or dispositive power.
The filing notes that these securities are held by certain BlackRock business units in the ordinary course of business and are not held for the purpose of changing or influencing control of Comfort Systems USA. Various underlying clients have rights to dividends or sale proceeds, but no single client holds more than five percent of the company’s outstanding common shares.
Comfort Systems USA, Inc. director reported a small change in ownership of company stock. On 12/03/2025, the reporting person made a transaction in Common Stock coded as "G," which the footnotes explain is a charitable donation of 270 shares at a stated price of $0.
After this donation, the director beneficially owns 82,631 shares of Comfort Systems USA stock directly and 12,495 shares indirectly through a partnership interest. The indirect transfer details for the 12,495 shares are referenced as being described in a prior filing dated 10/31/2025.
Comfort Systems USA, Inc. reported insider stock activity by its Chief Financial Officer on a Form 4. On December 1, 2025, the CFO had 3,279 shares of common stock forfeited in connection with the second vesting of restricted stock units granted on November 14, 2023, based on an average price of $955.725. The same day, the CFO sold 4,370 shares of common stock at an average price of $958.8785, with full trade details available from the company’s Office of the General Counsel on request. The filing also reports a 2,000‑share charitable donation of common stock. After these transactions, the CFO beneficially owned 37,824 shares of Comfort Systems USA common stock, held directly.
Comfort Systems USA, Inc. (FIX) disclosed an insider stock sale by its President and Chief Executive Officer, who is also a director. On 11/24/2025, the reporting person sold 7,158 shares of common stock in an open market transaction coded as a sale. The filing reports an average sale price of $947.9806 per share, with a note that detailed trade prices and share breakdown are available upon request from the company’s Office of the General Counsel.
After this transaction, the insider beneficially owns 180,888 shares of Comfort Systems USA common stock in direct form. The filing is made on Form 4, which is used to report changes in the ownership of company securities by officers, directors, and other insiders.
FIX filed a Form 144 notice for a planned sale of 7,158 common shares. The shares are to be sold on the NYSE through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated aggregate market value of $6,785,645.13 and with 35,271,950 shares of the class shown as outstanding. The approximate sale date is 11/24/2025.
The securities were acquired on 04/03/2017 from the issuer as compensation for past services, with payment also dated 04/03/2017 and described as compensation. By signing, the selling person represents that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.
Comfort Systems USA, Inc. (FIX) disclosed an insider stock transfer on a Form 4. A company director reported giving away 800 shares of common stock on 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.
Capital World Investors filed Amendment No. 1 to a Schedule 13G reporting beneficial ownership of 1,799,310 shares of Comfort Systems USA (FIX) common stock, representing 5.1% of the class as of 09/30/2025.
The filer reports sole voting power over 1,799,310 shares and sole dispositive power over 1,799,310 shares, with no shared power. The percentage is based on 35,281,452 shares believed to be outstanding. The filing is made on a passive basis, certifying the securities were acquired and are held in the ordinary course and not to change or influence control.
FMR LLC filed a Schedule 13G reporting a passive ownership stake in Comfort Systems USA, Inc. (FIX). FMR beneficially owns 1,892,021.47 shares of common stock, representing 5.4% of the class as of 09/30/2025. FMR reports sole voting power over 1,878,665.40 shares and sole dispositive power over 1,892,021.47 shares.
Abigail P. Johnson is also listed as a reporting person with sole dispositive power over 1,892,021.47 shares and no voting power. The filing certifies the securities were acquired and are held in the ordinary course of business and not to change or influence control. Item 6 notes one or more other persons may have rights to dividends or sale proceeds, with no single person over five percent.
Comfort Systems USA (FIX) reported an insider transaction on a Form 4. A director sold 4,000 shares of common stock on 10/31/2025 at an average price of $958.7222.
Following the sale, the reporting person beneficially owned 22,535 shares, held directly. The filing notes the price shown represents an average; full trade details are available upon request from the company’s Office of the General Counsel.