CoStar Group has the GF Score of 56, which implies that the company
might have
Poor future performance potential.
The GF Score is a stock performance ranking system developed by GuruFocus using five aspects of valuation, which has been found to be closely correlated to the long-term performances of stocks by backtesting from 2006 to 2021. The stocks with a higher GF Score generally generate higher returns than those with lower GF Scores. Therefore, when picking stocks, investors should invest in companies with high GF Scores. The GF Score ranges from 0 to 100, with 100 as the highest rank.
GF Score takes following five key aspects into consideration:
Each one of these components is ranked and the ranks also have positive correlation with the long term performances of stocks. The GF score is calculated using the five key aspects of analysis. Through backtesting, we know that each of these key aspects has a different impact on the stock price performance. Thus, they are weighted differently when calculating the total score. The Profitability Rank and the Growth Rank are weighted fully, while other parameters have less weight.
Based on research and backtesting result, GuruFocus believes CoStar Group
might have
Poor future performance potential.
Please click GF Score to see more details on the GF Score's 5 Key Aspects of Analysis.
CoStar Group (MIL:1CSGP) GF Score Explanation
Based on the historical long-term performances among five valuation aspects, the GF Score is found to be closely correlated to the long-term performances of stocks. It ranges from 0 to 100, with 100 as the highest. GuruFocus divided GF Score into following 5 categories:
GF Score
Performance Potential and All-in-One Screener Examples (1)
(1) These are some simple examples. You can access our GF Score filter under All-in-One Screener’s Fundamental tab.
CoStar Group GF Score Related Terms
MIL:1CSGP vs JLL, BEKE, COMP: GF Score Comparison
For the Real Estate Services subindustry, CoStar Group's GF Score, along with its competitors' market caps and GF Score data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
CoStar Group GF Score vs Real Estate Industry
For the Real Estate industry and Real Estate sector, CoStar Group's GF Score distribution charts can be found below:
* The bar in red indicates where CoStar Group's GF Score falls into.
CoStar Group (MIL:1CSGP) has a GF Score of 56 as of Jun. 28, 2026. GF Score is a stock performance ranking system developed by GuruFocus using five aspects of valuation. View historical data on CoStar Group and its competitors. This is 14% below median its historical median of 65.00. Over the past decade, CoStar Group's GF Score has ranged from 55.00 to 93.00.
Is CoStar Group's GF Score too high?
CoStar Group's current GF Score of 56 is 14% below median its 10-year median of 65.00. Over the past 10 years, this metric has ranged from a low of 55.00 to a high of 93.00. Overall, CoStar Group has a GF Score™ of 56/100 and is considered Significantly Undervalued, reflecting its overall financial health beyond just this single metric.
How does CoStar Group's GF Score compare to JLL and BEKE?
CoStar Group's GF Score of 56 can be compared against companies in the Real Estate industry. Historically, CoStar Group's own GF Score has ranged from 55.00 to 93.00 over the past decade. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good GF Score for a Real Estate company?
A good GF Score depends on the Real Estate industry context. However, GF Score should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high GF Score mean?
A high GF Score can signal that a stock is expensive relative to its fundamentals. GF Score is a stock performance ranking system developed by GuruFocus using five aspects of valuation. View historical data on CoStar Group and its competitors. CoStar Group's current GF Score is 56, which is 14% below median its own 10-year median of 65.00. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is CoStar Group stock overvalued right now?
Based on GuruFocus' analysis, CoStar Group (MIL:1CSGP) is currently considered Significantly Undervalued. The stock's GF Value™ is €90.73, compared to a current price of €26.90 — trading 70.4% below its estimated fair value. The current GF Score is 56, which is 14% below median its 10-year median of 65.00. CoStar Group's overall GF Score™ is 56/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is GF Score calculated?
GF Score is calculated from a company's financial statements. For CoStar Group (MIL:1CSGP), the current GF Score is 56 as of Jun. 28, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is CoStar Group (MIL:1CSGP) Overvalued in 2026?
Based on GuruFocus' analysis, CoStar Group stock appears to be undervalued.
The current stock price of €26.90 is trading 70.4% below its estimated GF Value™ of €90.73.
GuruFocus considers CoStar Group to be Significantly Undervalued.
Key valuation signals for MIL:1CSGP:
GF Score: 56 (14% below median its 10-year median of 65.00)
GF Value™: €90.73 vs. price of €26.90 (70.4% below fair value)
No single metric tells the full story. See the MIL:1CSGP stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
CoStar Group is a global provider of proprietary information, analytics, and online marketplaces serving both commercial and residential real estate. The firm operates through a diverse portfolio of brands, including CoStar Suite for commercial real estate research, LoopNet for commercial listings, Apartments.com for multifamily rentals, and Homes.com for residential brokerage. It primarily sells high-margin software-as-a-service subscriptions that provide institutional clients with forensic property data and premium advertising visibility. With operations across North America, Europe, and Asia-Pacific, CoStar maintains the industry's most comprehensive centralized real estate database, functioning as a critical information utility for brokers, lenders, and owners worldwide.
56GF Score
Get the complete analysis for MIL:1CSGP
GF Score is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
MIL:1CSGP has been successfully added to your 