COSTAR GROUP, INC. — Director's Dealing 2023

May 2, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP, INC. (CSGP)
CIK: 0001057352
Period of Report: 2023-04-28

Reporting Person: FLORANCE ANDREW C (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-04-28	Common Stock, par value $0.01 per share	M	360530	$18.28	Acquired	1334839	Direct
2023-04-28	Common Stock, par value $0.01 per share	S	360530	$76.77	Disposed	974309	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-04-28	Option to Acquire Common Stock	$18.28	M	360530	Disposed	2026-03-10	Common Stock (360530.0)	Direct

Footnotes

F1: Average based on sales prices ranging from $76.61 to $77.07.

F2: The option vested in three equal installments on March 11, 2017, March 11, 2018, and March 11, 2019.