Avoid the stress of overpaying for a stock or missing an opportunity by using the right tools and insights to evaluate CoStar Group, Inc. before investing.

In this article, we go over a few key elements for understanding CoStar Group, Inc.’s stock price such as:

• CoStar Group, Inc.’s current stock price and volume
• Why CoStar Group, Inc.’s stock price changed recently
• Upgrades and downgrades for CSGP from analysts
• CSGP’s stock price momentum as measured by its relative strength

About CoStar Group, Inc. (CSGP)

Before we jump into CoStar Group, Inc.’s stock price, history, target price and what caused it to recently dip, let’s take a look at some background.

CoStar Group, Inc. provides information, analytics, and online marketplace services to real estate and related business communities in the United States, Australia, Canada, Europe, the Asia Pacific, and Latin America. It offers CoStar Property that provides inventory of office, industrial, retail, multifamily, hospitality, and student housing, and land properties; CoStar Leasing, a data on lease transactions and tools to manage user-entered lease data; CoStar Sales, a database of commercial real estate sales transactions; CoStar Owners provides detailed portfolio information; CoStar Markets to view and report on market and submarket trends; and CoStar Tenant that provides tenant information. The company also provides hospitality benchmarking that allows hotels to measure performance against competitors; Debt Solutions, a tool for lenders to manage loan portfolios and risk; and real estate and lease management technology solutions, such as lease administration, lease accounting, and transaction management services. In addition, it offers Apartamentos.com, an apartment marketing sites; LoopNet.com, a commercial property marketing sites; Homes.com, a home for sale listings site; Ten-X, an online auction platform for commercial real estate; Land.com, a marketplace for rural land sales; and BizBuySell.com, a marketplace for operating businesses and franchises for sale. It serves sales, leasing, and mortgage brokers; property, real estate investment trust, insurance companies, and asset managers; and government agencies, property owners, mortgage-backed security issuers, appraisers, design and construction professionals, pension fund managers, real estate developers, reporters tenant vendors, bankers, building services vendors, mortgage bankers, communications providers, retailers, institutional advisors, hospitality owners, investors, and real estate agents. The company was founded in 1986 and is headquartered in Arlington, Virginia.

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CoStar Group, Inc.’s Stock Price as of Market Close

As of May 08, 2026, 10:46 AM, CST, CoStar Group, Inc.’s stock price was $33.480.

CoStar Group, Inc. is down 4.29% from its previous closing price of $34.980.

During the last market session, CoStar Group, Inc.’s stock traded between $33.090 and $34.640. Currently, there are approximately 413.00 million shares outstanding for CoStar Group, Inc..

CoStar Group, Inc.’s price-earnings (P/E) ratio is currently at 583.0, which is high compared to the Real Estate Management & Development industry median of 28.7. The price-earnings ratio gauges market expectation of future performance by relating a stock’s current share price to its earnings per share.

CoStar Group, Inc. Stock Price History

CoStar Group, Inc.’s (CSGP) price is currently down 3.27% so far this month.

During the month of May, CoStar Group, Inc.’s stock price has reached a high of $36.090 and a low of $33.090.

Over the last year, CoStar Group, Inc. has hit prices as high as $97.430 and as low as $33.315. Year to date, CoStar Group, Inc.’s stock is down 50.21%.

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What Caused CoStar Group, Inc. Stock’s Price to Dip?

Stock prices are primarily based on seller supply and buyer demand. But have you ever wondered about what other factors affect a stock's price?

When an analyst changes their opinion of a stock by upgrading or downgrading their rating, it often leads to a sudden stock price adjustment. As of May 07, 2026, there were 0 analysts who downgraded CoStar Group, Inc.’s stock and 1 analyst who upgraded over the last month.

Additionally, you'll want to evaluate CoStar Group, Inc.’s financial health and valuation. Investors can use AAII's Value Grade, which combines six key valuation metrics like P/E and P/S ratios for a comprehensive analysis to conduct analysis on CoStar Group, Inc.’s valuation and financial health. This approach mitigates the limitations of single-metric evaluations.

CoStar Group, Inc.’s current valuation based on AAII’s Value Grade is a F, which means it is considered to be Ultra Expensive.

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Lastly, news and media coverage as well as recent press reports about the company or its industry may cause stock prices to fluctuate. You can check out the most recent news articles about CoStar Group, Inc. (CSGP) by visiting AAII Stock Evaluator.

Relative Price Strength of CoStar Group, Inc.

Relative price strength measures a stock's performance against the market, helping investors identify stocks that are outperforming benchmarks.

For AAII’s Momentum Grade, a weighted relative price strength is calculated. Follow this link to learn more about the Momentum Grade.

As of May 07, 2026, CoStar Group, Inc. has a weighted four-quarter relative price strength of -23.50%, which translates to a Momentum Score of 8 and is considered to be Very Weak.

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CoStar Group, Inc. Stock Price: Bottom Line

As of May 8, 2026, CoStar Group, Inc.’s stock price is $33.480, which is down 4.29% from its previous closing price.

AAII advises against making stock decisions based solely on price or past returns. Instead, consider a variety of metrics, fundamentals, and analytics to evaluate a stock like CoStar Group, Inc. stock prices are influenced by market supply and demand and offer just a snapshot of a company's overall health.

Subscribing to AAII's A+ Investor provides access to comprehensive analytics and insights for confident investing.