[8-K] COSTAR GROUP, INC. Reports Material Event

Rhea-AI Filing Summary

CoStar Group (CSGP) announced its financial and operating results for the quarter ended September 30, 2025, and furnished the related press release as Exhibit 99.1. The company stated this information is furnished, not filed, under the securities laws.

CoStar also noted it plans to use its investor website (investors.costargroup.com) as a channel for material company information, including investor presentations.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 28, 2025

COSTAR GROUP, INC.

(Exact name of registrant as specified in its charter)

Delaware			0-24531			52-2091509
(State or other jurisdiction of incorporation or organization)			(Commission File Number)			(I.R.S. Employer Identification No.)

1201 Wilson Blvd.

Arlington,

VA

22209

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code: (202) 346-6500

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:  

Title of each class			Trading Symbol			Name of each exchange on which registered
Common Stock ($0.01 par value)			CSGP			Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

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Item 2.02     Results of Operations and Financial Condition.

On October 28, 2025, CoStar Group, Inc. (“CoStar Group” or the “Company”) announced its financial and operating results for the quarter ended September 30, 2025. The full text of the press release (the “Press Release”) issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information contained in this Item 2.02 and the Press Release shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the Securities and Exchange Commission (the "SEC"), whether made before or after the date hereof, except as expressly set forth by specific reference in such a filing.

Item 7.01    Regulation FD Disclosure.

The Company intends to utilize its corporate website as a channel of distribution for material company information, including, but not limited to, the posting of investor presentations from time to time. For more information, visit investors.costargroup.com. The information posted on the Company's website is not incorporated by reference into this Current Report on Form 8-K or in any other report or document the Company files with the SEC.

Item 9.01     Financial Statements and Exhibits.

Exhibit No.			Description
99.1			CoStar Group, Inc. Press Release Dated October 28, 2025.
104			Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

						COSTAR GROUP, INC.
						By: /s/ Christian M. Lown
Date:			October 28, 2025			Name: Christian M. Lown
						Title: Chief Financial Officer

FAQ

What did CoStar Group (CSGP) announce?

CoStar announced financial and operating results for the quarter ended September 30, 2025, with details provided in a press release.

Where can I find CoStar’s press release for the results?

It is furnished as Exhibit 99.1 to the report.

Is the information considered filed with the SEC?

No. The company stated the information is furnished, not filed, and not subject to liabilities of Section 18.

Where will CoStar post material company information going forward?

CoStar intends to use its investor website at investors.costargroup.com for distributing material information.

What exchange lists CoStar Group’s common stock and under what symbol?

Nasdaq Global Select Market under the symbol CSGP.

When was the press release dated?

October 28, 2025.