1 As filed with the Securities and Exchange Commission on September 26, 2000 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): September 26, 2000 COSTAR GROUP, INC. (Exact name of registrant as specified in its charter) Commission File Number: 0-24531 DELAWARE 52-2091509 (State or other jurisdiction of incorporation) (I.R.S. employer identification number) 2 Bethesda Metro Center Bethesda, MD (Address of principal executive offices) 20814 (Zip Code) (301) 215-8300 (Registrant's telephone number, including area code) 2 INFORMATION INCLUDED IN THIS REPORT ITEM 5. OTHER EVENTS On September 26, 2000, the Registrant issued a press release announcing the appointment of its Chief Operating Officer, a copy of which is attached as Exhibit 99.1 to this Report and incorporated herein by reference. ITEM 7. FINANCIAL STATEMENT AND EXHIBITS (c) Exhibits 99.1 Press Release dated September 26, 2000 issued by the Registrant. 3 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/ ----------------------------- Name: Frank A. Carchedi Title: Chief Financial Officer Date: September 26, 2000