Chicago Firm Trims Stake in CoStar Group

Investment firm reduces holdings in real estate data and analytics company

Apr. 18, 2026 at 7:37am

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A photorealistic studio still life featuring a stack of financial reports, a tablet displaying real estate data visualizations, and a geometric paperweight in muted shades of grey and blue, conceptually representing the analytical tools and data used by investors in the commercial real estate sector.Institutional investors closely monitor data and analytics firms serving the commercial real estate industry.Chicago Today

Chicago Capital LLC reduced its stake in CoStar Group, Inc. (NASDAQ: CSGP) by 13.8% in the fourth quarter, according to a recent SEC filing. The firm now owns approximately 827,123 shares of the technology company, making it one of CoStar's largest institutional investors.

Why it matters

CoStar Group is a leading provider of commercial real estate data and analytics, serving brokers, investors, and other industry professionals. Changes in ownership by major institutional investors can signal shifts in market sentiment or confidence around a company's performance and future prospects.

The details

According to the 13F filing, Chicago Capital LLC sold 132,919 shares of CoStar Group during the fourth quarter. The firm now owns approximately 0.20% of CoStar's outstanding shares, valued at $55.6 million as of the end of 2025. Several other major hedge funds and institutional investors also adjusted their CoStar positions during the quarter, with both increases and decreases in ownership reported.

  • Chicago Capital LLC filed its 13F report for the fourth quarter of 2025 on April 18, 2026.
  • The firm reduced its CoStar Group holdings by 13.8% during the October-December 2025 period.

The players

Chicago Capital LLC

A Chicago-based investment management firm that owns stakes in various technology and real estate companies.

CoStar Group, Inc.

A leading provider of commercial real estate data, analytics, and online marketplaces, serving brokers, investors, and other industry professionals.

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The takeaway

The reduction in Chicago Capital's CoStar Group holdings reflects broader market uncertainty around the commercial real estate data and analytics sector, as investors weigh factors like rising interest rates, economic conditions, and the evolving needs of real estate professionals.