CoStar Group (CSGP) Earnings: Q3 2026 Results

The quarter ended September 30, 2026 and CoStar Group published the results on October 27, 2026. Revenue and diluted EPS are shown against Q3 2025, the same quarter a year earlier, which takes seasonal swings out of the comparison. CoStar Group reports EPS two ways: GAAP, under the accounting rules every US filer follows, and Adjusted EPS, which leaves out items the company considers outside its operating results. The release reconciles the two, and when they diverge, the reconciliation says why.

• CoStar Group changed its segments from geography-based to product portfolio-based in the fourth quarter of 2025 and recast prior periods. It now reports Commercial Real Estate and Residential Real Estate.
• Q3 2025 was a net loss of $0.07 per diluted share. CoStar Group called its adjusted measure "non-GAAP net income per share" then and "Adjusted EPS" now; the year-ago figure is $0.23 under both names.

Source: CoStar Group Q3 2026 results, October 27, 2026. Also in the Form 10-Q for the quarter ended September 30, 2026. Figures as reported; checked against the release on November 10, 2026.

How CoStar Group splits revenue in its own release, under its own labels, for Q3 2026 against Q3 2025. Indented lines are parts of the line above them.

• CoStar Group's Commercial Real Estate revenue was $492 million in Q3 2026, up 7% from $461 million in Q3 2025, 52% of total revenue.
• CoStar Group's Residential Real Estate revenue was $460 million in Q3 2026, up 23% from $373 million in Q3 2025, 48% of total revenue.

Segment lines are the figures writers cite most often, because they show where the growth in a quarter came from. Companies redraw their segments from time to time and restate the prior year to match, so a year-ago figure here can differ from the one printed a year ago. When that has happened, the note above says so.

From the earnings release

In its Q3 2026 release, CoStar Group said:

“The Company is increasing its revenue guidance for 2026 to a range of $3.75 billion to $3.77 billion, representing revenue growth of approximately 16% year-over-year at the midpoint of the range.”

“The Company expects revenue for the fourth quarter of 2026 in the range of $976 million to $996 million, representing revenue growth of approximately 10% year-over-year at the midpoint of the range.”

“The Company is increasing its Adjusted EBITDA guidance for the full year of 2026 to a range of $820 million to $840 million”

“For the fourth quarter of 2026, the Company expects Adjusted EPS in a range of $0.46 to $0.50 based on 400 million shares.”

Source: CoStar Group Q3 2026 release, Oct 27, 2026.

This is the company's own guidance as of Oct 27, 2026, quoted as given. Walnut does not make forecasts of its own. Analyst estimates for the coming quarters are on the CSGP forecast page.

Revenue and diluted EPS for the last 5 quarters. Each date links to that quarter's release.

GAAP revenue and diluted EPS, each as first reported in that quarter's release. Q3 2025 was a net loss per share.

We do not hold a confirmed date for CoStar Group's next report. Companies post the date on their investor relations site a few weeks ahead, usually with the time of the conference call.

Each quarter keeps its own page with the figures as reported, so a link to one stays pointed at the same numbers after the next report.

• Q3 2026 (this page), reported Oct 27, 2026

CoStar Group's Q3 2026 revenue of $952 million came from two segments: Commercial Real Estate at $492 million and Residential Real Estate at $460 million. Inside Commercial Real Estate, the CoStar information product brought in $344 million, LoopNet $89 million and Other Commercial Real Estate $59 million. (CoStar Group Q3 2026 release, Oct 27, 2026)

CoStar Group said CoStar revenue rose $26 million, or 8%, on inflation-based price increases, more subscribers and additional sales of STR Benchmarking. LoopNet rose $10 million, or 13%, on more listings and the Domain acquisition completed in August 2025. Other Commercial Real Estate fell $5 million, or 8%, mainly because fewer properties transacted on Ten-X. (CoStar Group Form 10-Q, Q3 2026, Oct 28, 2026)

Residential Real Estate revenue rose $87 million, or 23%, to $460 million. $58 million of that came from the Domain and Zonda acquisitions (Zonda closed on August 21, 2026), and the rest from more memberships and properties advertised on the network. The segment's flagship U.S. brands are Apartments.com, Homes.com and Land.com. (CoStar Group Form 10-Q, Q3 2026, Oct 28, 2026; CoStar Group Form 10-K, 2025, Feb 26, 2026)

Revenue from subscription-based contracts was about 89% of CoStar Group's total in the quarter, down from 92%, which the 10-Q attributes primarily to Domain and to Matterport's transactional products. For the trailing 12 months the contract renewal rate for subscription services with a term of at least one year was about 88%, against 89% a year earlier. (CoStar Group Form 10-Q, Q3 2026, Oct 28, 2026)

CoStar Group earned $0.18 per diluted share on a GAAP basis in Q3 2026, against a loss of $0.07 a year earlier. Adjusted EPS was $0.38. Adjusted Net Income of $153 million adds back amortization of acquired intangible assets ($73 million), stock-based compensation ($32 million), acquisition and integration costs ($15 million) and settlements and impairments ($3 million), then applies an assumed 26% tax rate. (CoStar Group Q3 2026 release, Oct 27, 2026)

Buybacks cut the diluted share count to 401.9 million from 419.9 million. Under its $1.5 billion program CoStar Group repurchased 16.5 million shares for $668 million in the first nine months of 2026, including 11.2 million shares through a $500 million accelerated repurchase completed in March 2026 at $44.27 per share. Cash and cash equivalents fell to $500 million from $1,633 million at the end of 2025. (CoStar Group Q3 2026 release, Oct 27, 2026; CoStar Group Form 10-Q, Q3 2026, Oct 28, 2026)

The effective tax rate was about 12%, against 33% a year earlier. CoStar Group said the change was primarily due to income in the U.K. in 2026, compared with 2025 losses that were subject to a full valuation allowance. Net interest swung from $26 million of income a year earlier to $1 million of expense. (CoStar Group Form 10-Q, Q3 2026, Oct 28, 2026; CoStar Group Q3 2026 release, Oct 27, 2026)

Diluted EPS divides net income by the weighted average number of shares outstanding in the quarter, plus the shares that options and other equity awards could add. Buybacks shrink that count and lift EPS for the same profit; share issuance and stock awards enlarge it.

CoStar Group gives quarterly and full-year guidance in its release. With Q3 2026 it raised 2026 revenue guidance to $3.75 billion to $3.77 billion and Adjusted EBITDA to $820 million to $840 million, and guided Q4 2026 revenue of $976 million to $996 million and Adjusted EPS of $0.46 to $0.50 on 400 million shares. Full-year Adjusted EPS guidance is $1.38 to $1.41 on 405 million shares, with a non-GAAP tax rate of 26%. (CoStar Group Q3 2026 release, Oct 27, 2026)

On a GAAP basis the guidance implies diluted EPS of $0.24 to $0.27 for Q4 2026 and $0.56 to $0.60 for the year. CoStar Group also restated its 2028 Adjusted EBITDA target of $1.25 billion and said its expense review had identified potential additional savings of at least $200 million over the next 12 to 18 months. (CoStar Group Q3 2026 release, Oct 27, 2026)

A consensus figure is the average of the models published by the analysts who cover CoStar Group, collected by a data provider and revised up to the day of the report. A quarter that lands above it says how expectations were set as much as how the business did, and the share price on the day also reflects the guidance and the lines no consensus covers.

The consensus figures on this page are Yahoo Finance's, as pulled on the date shown. Each comes with the number of analysts behind it; the smaller that number, the more one revised estimate can move the average.

The figures below are the ones CoStar Group's own release and filings put weight on for Q3 2026, with the latest reported value for each.

What the quarter means for a holding is a separate question from what it reported. The case for and against owning CSGP is on is CSGP a buy or a sell?, what analysts expect next is on the CSGP forecast, and what the company does is on the CoStar Group (CSGP) stock page.

Every number on this page can be traced to a document CoStar Group published. Checking one takes a couple of minutes, and it is worth doing before you quote a figure anywhere.

• The results release is the document linked in the source line above. Companies publish it on their investor relations site at the moment results go out, and it carries the headline tables: revenue, operating income, net income and EPS for the quarter and the year-ago quarter.
• The same release is filed with the SEC as Exhibit 99.1 to a Form 8-K under Item 2.02, usually on the day of the report. The SEC copy does not change after the fact, which makes it the safer thing to link when you cite a number.
• The quarterly report (Form 10-Q) follows within a few weeks and carries the full financial statements, the segment note and management's discussion of what changed. The fourth quarter is covered by the annual report (Form 10-K) instead.
• Restated comparisons are flagged in the notes on this page. When a company redraws its segments or changes how it adjusts EPS, it restates the year-ago column, so the year-ago figure in a new release can differ from the one printed a year ago. This page always uses the comparison in the newer release, because that is the like-for-like one.

A walk-through of every line in a release, with what each one tells you, is in how to read an earnings report.