FRANK SIMURO - 01 Mar 2023 Form 4 Insider Report for COSTAR GROUP, INC. (CSGP)

Role: Chief Technology Officer
Signature: /s/ Michael Rosenthall, Attorney-in-Fact
Issuer symbol: CSGP
Transactions as of: 01 Mar 2023
Net transactions value: -$2,538,588
Form type: 4
Filing time: 03 Mar 2023, 16:45:59 UTC
Previous filing: 16 Feb 2023
Next filing: 21 Mar 2023
SEC: View on sec.gov

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	$429,966	-6,085	-1.8%	$70.66	337,577	01 Mar 2023	Direct
transaction	CSGP	Common Stock, par value $0.01 per share	Options Exercise	$359,948	+35,220	+10%	$10.22^*	372,797	01 Mar 2023	Direct
transaction	CSGP	Common Stock, par value $0.01 per share	Sale	$2,468,570	-35,220	-9.4%	$70.09	337,577	01 Mar 2023	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CSGP	Option to Acquire Common Stock	Options Exercise	$0	-35,220	-100%	$0.000000^*	0	01 Mar 2023	Common Stock	35,220	$10.22	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Average based on sales prices ranging from $69.92 to $70.37.
F2	The option vested in three equal installments on March 11, 2014, March 11, 2015, and March 11, 2016.