Comfort Systems USA (FIX) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
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Comfort Systems USA, Inc. (FIX) insider buying and selling: no purchases, 35 sales
68 Form 4 Table I transactions filed with the SEC by Comfort Systems USA, Inc. insiders between 2025-08-25 and 2026-08-27 (15-month history): 0 open-market purchases and 35 sales, plus 33 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $25.8M by Lane Brian E. on 2026-08-26.
Comfort Systems USA insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, Comfort Systems USA insiders filed 30 sales worth $185.2M on the open market, and no purchases.
The biggest seller was Lane Brian E. (CHIEF EXECUTIVE OFF.): $68.1M in 4 sales, out of 12 different sellers.
The largest trade of the period was a sale of $25.8M on Aug 26, 2026, by Lane Brian E. (CHIEF EXECUTIVE OFF.). Form 4 on sec.gov (0001448240-26-000019).
None of the 30 sales carries the 10b5-1 plan flag on the Form 4 (sales scheduled months ahead).
The last three months show 4 sales, against 9 in the three before. The latest sale from Aug 26, 2026.
Against its sector (Industrials, 75 companies with an insider page on this site), over the same dates the median is 8 sales and 0 purchases on the open market. Comfort Systems USA has more sales than 67 of the other 74, ranks 4 of 75 by net dollars sold, and 28 of the 75 have at least one purchase.
The 20 most important trades
With no open-market purchases, the table starts with FIX's sales, largest first. The full history is in the tool above, already searched.
See all 68 FIX trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2026-08-26 | 2026-08-27 | Lane Brian E. | CHIEF EXECUTIVE OFF. | $25.8M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-05-05 | 2026-05-06 | Lane Brian E. | CHIEF EXECUTIVE OFF. | $21.9M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-02-25 | 2026-02-26 | Lane Brian E. | PRESIDENT/CHIEF EXECUTIVE OFF. | $13.6M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-06-24 | 2026-06-26 | Myers Franklin | Director | $13.1M | S — Open-market saleForm 4 footnoteF1 The Reporting Person contributed FIX common stock to an exchange fund in exchange for shares of the exchange fund. The FIX common stock was valued at $1,954.47 per share for the purpose of determining the number of shares of the exchange fund issuable to the Reporting Person. | SEC |
| 2026-02-23 | 2026-02-24 | George William Iii | CHIEF FINANCIAL OFFICER | $12.9M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-02-25 | 2026-02-27 | Myers Franklin | Director | $12.7M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-05-07 | 2026-05-08 | Myers Franklin | Director | $8.6M | S — Open-market saleForm 4 footnoteF2 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. | SEC |
| 2026-05-08 | 2026-05-12 | George William Iii | CHIEF FINANCIAL OFFICER | $7.8M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2025-11-24 | 2025-11-25 | Lane Brian E. | PRESIDENT/CHIEF EXECUTIVE OFF. | $6.8M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-08-11 | 2026-08-12 | Myers Franklin | Director | $6.8M | S — Open-market sale Indirect holding, through: Partnership Interest 2 Form 4 footnotesF1 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. F2 The shares held indirectly were transferred from direct to indirect beneficial ownership in a transaction exempt from Section 16 pursuant to Rule 16a-13. | SEC |
| 2026-03-03 | 2026-03-05 | Anderson Darcy | Director | $6.2M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-08-10 | 2026-08-12 | Myers Franklin | Director | $5.9M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2025-10-29 | 2025-10-31 | Myers Franklin | Director | $5.0M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-08-17 | 2026-08-18 | George William Iii | CHIEF FINANCIAL OFFICER | $4.7M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2025-12-01 | 2025-12-03 | George William Iii | CHIEF FINANCIAL OFFICER | $4.2M | S — Open-market saleForm 4 footnoteF3 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. | SEC |
| 2025-10-31 | 2025-11-03 | Anderson Darcy | Director | $3.8M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-02-24 | 2026-02-26 | Sandbrook William J | Director | $3.6M | S — Open-market sale2 Form 4 footnotesF1 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. F2 Shares held directly by the Reporting Person, including 170 shares held indirectly by the Reporting Person. | SEC |
| 2026-03-03 | 2026-03-04 | Shaeff Julie | CHIEF ACCOUNTING OFFICER | $3.2M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
| 2026-04-29 | 2026-04-30 | Sandbrook William J | Director | $2.6M | S — Open-market sale2 Form 4 footnotesF1 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. F2 Shares held directly by the Reporting Person, including 170 shares held indirectly by the Reporting Person. | SEC |
| 2025-10-29 | 2025-10-30 | Mercado, Pablo G. | Director | $2.5M | S — Open-market saleForm 4 footnoteF1 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. | SEC |
The period balance: money in, money out
In the Form 4 filings submitted between Aug 25, 2025 and Aug 27, 2026 there is not one open-market purchase of Comfort Systems USA, Inc.: 35 sales worth $189.6M and zero dollars bought.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like Comfort Systems USA, Inc.'s is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| S | Open-market sale | 35 | $189.6M |
| A | Grant or award | 15 | $0 |
| F | Tax withholding (shares surrendered for taxes) | 12 | $14.2M |
| G | Gift | 5 | $0 |
| M | Option exercise | 1 | $383k |
| Total | Everything filed in the period | 68 | $204.2M |
20 of the 68 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 16 distinct people or entities have filed Comfort Systems USA, Inc. transactions: none bought on the open market and 12 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
Of the 12 who sold on the open market (35 sales in all), the three biggest sellers account for $151.8M of the $189.6M: 80% of the money in three people.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Lane Brian E. | CHIEF EXECUTIVE OFF. | 7 | — | $68.1M (4) | 2026-08-27 |
| Myers Franklin | Director | 10 | — | $52.1M (6) | 2026-08-12 |
| George William Iii | CHIEF FINANCIAL OFFICER | 11 | — | $31.7M (5) | 2026-08-18 |
| Anderson Darcy | Director | 3 | — | $10.0M (2) | 2026-05-19 |
| Sandbrook William J | Director | 6 | — | $7.8M (5) | 2026-05-19 |
| Shaeff Julie | CHIEF ACCOUNTING OFFICER | 5 | — | $5.4M (2) | 2026-05-11 |
| Mercado, Pablo G. | Director | 5 | — | $4.9M (4) | 2026-05-19 |
| Bulls Herman E | Director | 4 | — | $4.2M (2) | 2026-05-19 |
Shown here are the 8 who moved the most money, out of 16. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Feb 2026: 0 purchases and 7 sales, worth $46.0M. 4 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 3 | $3.4M |
| Sep 2025 | 0 | $0 | 2 | $1.1M |
| Oct 2025 | 0 | $0 | 4 | $13.4M |
| Nov 2025 | 0 | $0 | 1 | $6.8M |
| Dec 2025 | 0 | $0 | 2 | $5.2M |
| Jan 2026 | 0 | $0 | 0 | $0 |
| Feb 2026 | 0 | $0 | 7 | $46.0M |
| Mar 2026 | 0 | $0 | 3 | $10.9M |
| Apr 2026 | 0 | $0 | 2 | $3.5M |
| May 2026 | 0 | $0 | 6 | $43.2M |
| Jun 2026 | 0 | $0 | 1 | $13.1M |
| Jul 2026 | 0 | $0 | 0 | $0 |
| Aug 2026 | 0 | $0 | 4 | $43.2M |
| Sep 2026 | 0 | $0 | 0 | $0 |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
Comfort Systems USA, Inc. (FIX) analysis page →
Other Industrials companies with insider trades
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Which insiders are buying their own company stock →
How to read this data
None of the 20 sales in the table is flagged as scheduled (10b5-1 plan), the kind signed months ahead and executed automatically. Comfort Systems USA has no open-market purchase (code P) in the history, the most common case in the S&P 500: insiders are already paid in stock. The latest filing is from Aug 27, 2026, and a Form 4 arrives up to two business days after the trade.
20 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.