Key Highlights

  • CoStar Group shares rose 5.99% on October 30, 2026.
  • No company-specific news dated October 29 or 30 was identified.
  • The shares had fallen about 9.7% over October 27 and 28.
  • Third-quarter Revenue was a record $952 million, up 14%.

CoStar Group (NASDAQ:CSGP), the Washington-based provider of Commercial Real Estate data and online marketplaces including LoopNet, Apartments.com and Homes.com, rose 5.99% on Friday and held the gain through the session even as the broad market slid. A search of news and filings dated October 29 and 30 found no new company-specific announcement.

Context From the October 27 Report

The most recent major news was CoStar's third-quarter report on Tuesday, October 27, which showed record revenue of $952 million, up 14%, Net Income of $74 million and record adjusted EBITDA of $229 million, roughly double the prior-year level. CoStar raised its full-year 2026 adjusted EBITDA guidance, and coverage noted a planned Acquisition of aerial imagery company Vexcel for about $730 million.

A Rebound After a Slide

The initial reaction was not positive. The shares fell about 9.7% across October 27 and 28 on soft revenue guidance and bookings that disappointed, even as EBITDA doubled. Friday's gain therefore looks more like a rebound than a reaction to new information, as some investors revisited the profit improvement. Month-end Rebalancing may also have played a part, since Friday was the last trading day of October.

Rotation Away From the AI Trade

The S&P 500 fell 140.32 points, or 1.8%, to 7,580.07 and the Nasdaq Composite dropped 747.73 points, or 2.9%, to 25,437.00, as Intel (NASDAQ:INTC)'s weak outlook triggered a chip rout and Amazon (NASDAQ:AMZN)'s results revived worries about AI spending. Investors looking for companies with improving profits and less exposure to the AI hardware cycle may have rotated toward names like CoStar, whose businesses rest on real estate information and advertising.

The Homes.com Question

CoStar's story has long been the trade-off between its profitable commercial information Business and heavy spending to build Homes.com. Investors will watch Homes.com growth, sales productivity after the shift to field-based selling and progress closing and integrating Vexcel.