• EN

    • -+ 0.00%
    -+ 0.00%
    -+ 0.00%

    Is CoStar Group (CSGP) A Bargain After Q3 Expectations Put Apartments.com In Focus?

    Simply Wall St·10/18/2026 01:33:38
    Listen to the news

    Q3 expectations put CoStar Group in the spotlight

    Investor focus has zeroed in on CoStar Group (CSGP) ahead of its October 27 Q3 report, with attention split between expected adjusted EPS and EBITDA performance, as well as lingering questions around Apartments.com platform stability.

    Recent trading has turned more constructive for CoStar Group, with the share price up 8.9% over the past week and 11.1% over the past month. However, the year to date share price return is still down 50.8% and the 1 year total shareholder return has fallen 56.3%, which keeps attention fixed on whether upcoming Q3 numbers and the Apartments.com recovery can shift the longer term narrative.

    Scan how CoStar Group’s setup compares to other potential rebound stories by reviewing our hand-picked list of 33 high quality undervalued stocks.

    CoStar Group’s sharp bounce hints either at rising confidence in the underlying real estate platforms or at a short term mood swing in the market. The next step is to see which story the current valuation supports.

    Most Popular Narrative: 13% Undervalued

    Against a last close of $32.31, the most followed narrative pegs CoStar Group’s fair value at $37.30. This frames today’s rebound as investors testing how much of that gap they actually believe.

    The key thing that has to go right is that CoStar Group turns Homes.com, Apartments.com, Zonda, international portals and AI products into a durable, profitable multi-vertical platform, despite muted bookings, lower revenue guidance and competitive pressure in multifamily advertising.

    The current valuation of CoStar Group implies that the market is discounting execution risk around revenue growth, Homes.com scalability and AI disruption more heavily than the recent uplift in margins and record adjusted EBITDA guidance.

    See why 30 investors see CoStar Group as 13% undervalued.

    Result: Fair Value of $37.30 (UNDERVALUED)

    Still, this narrative can wobble if muted net new bookings persist, or if pressure on Apartments.com pricing continues to weigh on average revenue per property.

    Find out about the key risks to this CoStar Group narrative.

    Another view on CoStar Group’s valuation

    The narrative leans on future earnings power, yet today’s pricing paints a slightly different picture. CoStar Group trades on a P/S of 3.7x, compared with 2.5x for the wider US real estate sector and 1.3x for peers, while matching its own fair ratio of 3.7x. That keeps the stock looking reasonably priced on sales, but raises the question of how much upside is already reflected in current expectations.

    For a closer look at what the numbers imply at different price points, take a look at our valuation breakdown, including the detailed sales multiples and peer checks, in See what the numbers say about this price — find out in our valuation breakdown.

    NasdaqGS:CSGP P/S Ratio as at Oct 2026
    NasdaqGS:CSGP P/S Ratio as at Oct 2026

    Next Steps

    Mixed signals on CoStar Group can be useful if you treat them as raw material, not a verdict. Move quickly to shape your own takeaway using 2 key rewards and 1 important warning sign.

    Looking for more CoStar Group sized opportunities?

    CoStar Group might be your starting point, but your edge comes from lining up multiple ideas and seeing which ones truly fit your plan.

    This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.