5 Most Oversold S&P 500 Stocks So Far in 2026

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1. CoStar Group, Inc. (NASDAQ:CSGP)

Share Price Decline Versus 52-Week High: 66.85%

Relative Strength Index: 34.08

Number of Hedge Fund Holders: 62

CoStar Group, Inc. (NASDAQ:CSGP) is among the 10 Most Oversold S&P 500 Stocks So Far in 2026. On May 29, the company announced that it had reached a definitive agreement to acquire housing‑market data provider Zonda for $800 million in cash.

The acquisition will expand the company’s offerings with the inclusion of the leading B2B information platform in the home construction industry and will also add NewHomeSource.com to its family of marketplaces.

CoStar Group, Inc. (NASDAQ:CSGP) described Zonda as an appealing business with strong profit margins and an impressive customer retention rate, while adding that much of its revenue is generated through subscriptions.

The transaction is expected to close during the back half of 2026. The acquisition is anticipated to be accretive to adjusted earnings per share in the first full year of ownership.

Following the news, William Blair analyst Stephen Sheldon reiterated the firm’s bullish outlook on the stock by maintaining a Buy rating.

As of the close of business on May 29, CSGP is a Strong Buy based on the recommendations from 14 analysts, and has an average share price upside potential of 57%.

CoStar Group, Inc. (NASDAQ:CSGP) is a leading provider of online real estate marketplaces, analytics, information, and 3D digital twin technology. The company was founded in 1986 and is focused on digitizing the real estate space.

While we acknowledge the potential of CSGP to grow, our conviction lies in the belief that some AI stocks hold greater promise for delivering higher returns and have limited downside risk. If you are looking for an AI stock that is more promising than CSGP and that has 100x upside potential, check out our report about the cheapest AI stock.

READ NEXT: 10 Best Performing Defense Stocks So Far in 2026 and 10 Stocks That Will Make You Rich Over the Next Decade.

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