How did Comfort Systems stock react to its Q3 earnings?

FIX fell 9.3% to $1,160.86 on Oct 23, 2026, after Comfort Systems reported Q3 revenue of $3.77B and diluted EPS of $13.91. The mechanical and electrical contractor’s earnings release reported net income of $489.0M. Revenue and earnings grew from a year earlier, while the shares fell from the Oct 22 close of $1,279.37.

The 8-K was accepted after the Oct 22 regular session. By then, the stock had already fallen 11.1% across four sessions. The next-day decline extended a retreat that began before the results were filed.

Q3 revenue rose 53.7%, from $2,450.969M to $3,766.302M. The Q3 10-Q reports net income rising 67.7%, from $291.615M to $489.044M, and diluted EPS rising 68.6%, from $8.25 to $13.91. Net income measures total profit; diluted EPS divides it across the diluted weighted-average share count.

Growth also continued from the previous quarter. The Q2 10-Q reports revenue of $3,265.656M, net income of $441.602M and diluted EPS of $12.53. Q3 revenue was 15.3% higher, net income was 10.7% higher and diluted EPS was 11.0% higher. The sequential increases were smaller than the annual increases across all three measures.

Gross margin was 24.8%, unchanged at the reported precision from Q3 2025 and below Q2’s 25.9%. Operating margin nevertheless rose to 16.6% from 15.5% a year earlier. Selling, general and administrative expenses fell from 9.4% to 8.3% of revenue. The business earned more operating profit per dollar of sales as overhead grew more slowly than revenue.

Backlog reached $17.81B on Sep 30, 2026, up from $14.06B on Jun 30, 2026, and $9.38B on Sep 30, 2025. The 10-Q reports growth of 26.7% sequentially and 90.0% year over year. Same-store backlog increased $3.67B sequentially and $8.01B year over year, separating growth in existing operations from additions through acquisitions.

The revenue comparison tells a similar story. Same-store activity contributed a 46.3% increase and acquisitions contributed a 7.4% increase, each measured against prior-year revenue. Management attributed same-store growth to strong market conditions and increased backlog, particularly demand from technology customers and data centers.

Backlog measures revenue still to be recognized under contracted or committed installation and replacement projects. Service agreements, service work and short-duration projects generally do not pass through it. It captures a large pool of future project work, but cancellations and adjustments can change how much becomes revenue or profit.

Comfort Systems reported $805.623M of free cash flow for Q3. The release’s cash-flow table starts with $1,010.126M of operating cash flow, subtracts $210.600M of property and equipment purchases, and adds $6.097M from asset sales. Operating cash flow was $553.271M in the year-earlier quarter.

Operating cash flow exceeded the quarter’s $489.044M of net income. The company’s free-cash-flow calculation includes equipment spending and asset-sale proceeds, so it shows what remained after those investments. That makes it a separate measure from the profit reported in the income statement.

The 10-Q describes the cash cycle behind the figures. Equipment and labor costs can precede customer payments. The company recognizes revenue and profit as projects progress, using estimates of the work and costs involved. Customer payments, project spending and recognized earnings therefore fall on different schedules.

FIX had fallen 29.6% from its Oct 6, 2026 close of $1,817.96 to $1,279.37 on Oct 22, before the results 8-K was accepted. That followed a 17.0% rise from the Sep 1 close of $1,554.37 to Oct 6. The stock’s direction had reversed well before the earnings disclosure.

The shorter window starts at $1,439.07 on Oct 16, 2026. The close fell 11.1% through Oct 22, then another 9.3% on Oct 23. The combined five-session decline was 19.3%. Those changes compound: the second decline starts from the lower Oct 22 price.

At $1,160.86 on Oct 23, 2026, FIX was 44.0% below its highest daily high of $2,073.99 in the trailing 252 sessions. Its closing-price change over 252 sessions was still positive at 46.8%. The recent retreat had erased the September run-up while leaving the stock above its older closing-price starting point.

The 9.3% next-session decline measures all trading between the Oct 22 and Oct 23, 2026 closes, not the effect of the results alone. The filings do not establish investors’ expectations, and that one session supplies neither a valuation nor a forecast.

Monk.trade read Comfort Systems’ Form 8-K filings reporting results of operations (Item 2.02) in the five sessions to the Oct 23, 2026 close and found one, filed on Oct 22 after the regular session. The reaction is the Oct 23 close against the Oct 22 close.

The four sessions before compare the Oct 22 close with the Oct 16 close; the week compares the Oct 23 close with the Oct 16 close. The 52-week high is the highest daily high in the last 252 sessions. Revenue, net income, earnings per share and backlog are quoted from the press release filed as Exhibit 99.1.

• This page reports what the company filed and how the stock closed; it does not compare the results with analysts’ estimates.
• The stock was falling before the filing, so the Oct 23 move is not a measure of the results alone.
• Closes are regular-session daily closes; trading after the Oct 22 close is not shown.
• Figures are as of the Oct 23, 2026 close.

• Form 8-K filed Oct 22, 2026 (0001104659-26-118156) ↗
• Exhibit 99.1: third quarter 2026 results press release ↗
• Q3 2026 Form 10-Q: results, acquisitions and backlog ↗
• Q2 2026 Form 10-Q: preceding-quarter comparison ↗

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