FREDERICK G. SAINT - 01 Mar 2026 Form 4 Insider Report for COSTAR GROUP, INC. (CSGP)

Role: President, Marketplaces
Signature: /s/ Gene Boxer, Attorney-in-Fact
Issuer symbol: CSGP
Transactions as of: 01 Mar 2026
Net transactions value: +$411,386
Form type: 4
Filing time: 03 Mar 2026, 16:09:07 UTC
Previous filing: 03 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SAINT FREDERICK G.	President, Marketplaces	C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON	/s/ Gene Boxer, Attorney-in-Fact	03 Mar 2026	0001500076

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CSGP	Common Stock, par value $0.01 per share	Tax liability	$495,214	-11,096	-4.1%	$44.63	259,851	01 Mar 2026	Direct	F1
transaction	CSGP	Common Stock, par value $0.01 per share	Purchase	$906,600	+20,000	+7.7%	$45.33	279,851	02 Mar 2026	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63.
F2	Average based on sales prices ranging from $45.26 to $45.38