Key Highlights

● CoStar reported third-quarter revenue of $952 million.

● The company raised its full-year guidance.

● Investors viewed the guidance as only matching expectations.

● Real estate was among the weakest S&P 500 sectors.

CoStar Group posted double-digit revenue growth and lifted its full-year outlook, but shares still sank as investors judged the revenue guidance underwhelming.

CoStar Group (NASDAQ:CSGP) sank on Wednesday, October 28, ranking among the steepest decliners in the S&P 500 on a day when the benchmark index rose for a third straight session.

Growth, but Not Enough of a Surprise

The commercial real-estate data and online marketplace company reported third-quarter revenue of $952 million, growing at a double-digit pace from a year earlier, and raised its full-year guidance. Yet the stock moved sharply in the opposite direction.

According to one closing market recap, CoStar's full-year revenue guidance only matched expectations and was viewed as disappointing. Taken together, the picture is of a market that wanted more than an incremental raise.

What CoStar Does

CoStar runs a portfolio of property-information and listings businesses, including its flagship commercial real-estate database and residential and rental marketplaces. The company has spent heavily in recent years to build out its residential platform, and investors have been watching closely for signs that the spending is translating into faster top-line growth.

A $952 million quarter and a lifted outlook would normally be read as good news. But when a raise lands only where analysts were already expecting, it can leave little room for upside. That reaction echoed other moves on Wednesday: several companies that merely met forecasts fell, while some posting clear beats and big raises tied to AI infrastructure rallied.

A Tough Day for Rate-Sensitive Real Estate

CoStar's business is closely tied to property markets, and Wednesday was not kind to real-estate-linked stocks. Real estate was among the weakest S&P 500 sectors, alongside utilities and consumer staples, as long-dated Treasury yields climbed. The 10-year yield pushed past a key psychological threshold, its largest daily gain since late September.

Higher borrowing costs tend to weigh on property transactions and valuations, which matters for a company whose customers include brokers, landlords, lenders and investors. CoStar was one of several S&P 500 members punished for guidance that failed to excite, alongside F5 (NASDAQ:FFIV) and Boston Scientific (NYSE:BSX).

What to Watch

The S&P 500 closed up 21.38 points at 7,743.98, the Dow Jones Industrial Average rose 97.53 points to 52,475.10 and the Nasdaq Composite gained 72.04 points to 26,549.85. Gains were narrow, however, with the equal-weight S&P 500 slipping slightly.

Investors will be looking for analysts' reaction to CoStar's outlook. More broadly, Thursday brings the advance estimate of third-quarter GDP and September PCE inflation at 8:30 a.m. ET, data that could shift expectations for another Fed hike in December.