SCHEDULE: Vanguard Discloses 7.53% Stake in CoStar Group

Vanguard Capital Management has reported a beneficial ownership of 7.53% in CoStar Group Inc. common stock as of March 31, 2026.

Summary

• Vanguard Capital Management, along with its affiliates, now beneficially owns 31,613,997 shares of CoStar Group Inc. common stock.
• This holding represents 7.53% of the class of securities.
• Vanguard Capital Management has sole voting power over 4,190,094 shares and sole dispositive power over 31,613,997 shares.
• The filing indicates that Vanguard funds and other managed accounts have the right to receive or direct the receipt of dividends and sale proceeds, but no single other person's interest exceeds 5%.

Sentiment

Score: 6

Explanation: StockSavvy.ai views this as a neutral to slightly positive filing, indicating significant institutional interest from a major player like Vanguard, but without specific operational or financial performance data from CoStar Group itself.

Positives

• Vanguard's significant stake suggests confidence in CoStar Group's long-term prospects.
• The filing confirms Vanguard's role as a major institutional investor, which can provide stability and credibility.

Negatives

• The filing does not contain any negative financial or operational information about CoStar Group.

Risks

• Potential for increased shareholder activism or influence from Vanguard due to its substantial ownership.
• Market perception of Vanguard's investment could be influenced by broader market conditions affecting technology and real estate data companies.

Future Outlook

The filing is a snapshot of ownership as of March 31, 2026, and does not contain forward-looking statements or guidance from CoStar Group itself. Vanguard's future actions regarding its stake are not disclosed.

Management Comments

• In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd.
• This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power.
• This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.
• Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.
• By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under 240.14a-11.

Industry Context

StockSavvy.ai notes that Vanguard's increased stake in CoStar Group, a leader in commercial real estate information and analytics, aligns with broader trends of institutional investors consolidating positions in data-centric companies that benefit from recurring revenue models and network effects.

Stakeholder Impact

• Shareholders: The increased stake by a major institutional investor like Vanguard may be viewed positively, potentially increasing demand for the stock and signaling confidence in the company's future.
• Management: CoStar Group's management will need to consider Vanguard's significant ownership in strategic decisions and corporate governance matters.
• Other Investors: The filing provides transparency on ownership, allowing other investors to assess the shareholder base.

Next Steps

• Vanguard will continue to hold and potentially adjust its stake in CoStar Group based on its investment strategies.
• CoStar Group may engage with Vanguard as a significant shareholder on corporate matters.

Key Dates

Recommendation

This filing is a disclosure of ownership by Vanguard and does not contain operational or financial results for CoStar Group. While Vanguard's significant stake is a positive indicator of institutional confidence, it does not provide sufficient information to warrant a buy or sell recommendation on its own. A 'hold' recommendation is appropriate pending further analysis of CoStar Group's performance.

Keywords

CoStar Group, Vanguard, Schedule 13G, Beneficial Ownership, Institutional Investor, Common Stock, SEC Filing, Investment Management