COSTAR GROUP, INC. — Director's Dealing 2026

Mar 4, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP, INC. (CSGP)
CIK: 0001057352
Period of Report: 2026-02-27

Reporting Person: Ruggles Lisa (Senior VP, Global Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-03-01	Common Stock, par value $0.01 per share	F	8931	$44.63	Disposed	177892	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-27	Restricted Stock Units	$	A	28197	Acquired		Common Stock, par value $0.01 per share (28197)	Direct

Footnotes

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: Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock.

F3: The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029.