COSTAR GROUP, INC. (CSGP) · Initial Holdings (Form 3) SEC Filing

Initial Statement of Beneficial Ownership

descriptionView SEC Filing

ACC: 0002146463-26-000003open_in_new

Total Value$0

Trades2

Insiders1

Transaction Details

Rossmann Robin Jack

Chief Financial Officer·Direct

Restricted Stock UnitsDerivative

Shares0

Price-

Total Value$0

Holding Only

Footnotes ▸

Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. | The restricted stock units vest in four equal installments on March 15, 2027, March 15, 2028, March 15, 2029, and March 15, 2030. | The restricted stock units vest in four equal installments on March 15, 2027, March 15, 2028, March 15, 2029, and March 15, 2030.

Rossmann Robin Jack

Chief Financial Officer·Direct

Common Stock, par value $0.01 per share

Shares0

Price-

Total Value$0

Shares Owned After86.69K

Post-Transaction Holdings

Rossmann Robin Jack

Security	Shares	Change
Common Stock, par value $0.01 per share	86.69K	-
Restricted Stock Units	-	-

Original SEC Filing Textexpand_more

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-07-31 --- Issuer --- Name: COSTAR GROUP, INC. (CSGP) CIK: 0001057352 --- Reporting Owner --- Name: Rossmann Robin Jack CIK: 0002146463 Role: Officer (Chief Financial Officer) --- Holdings --- [Holding #1] Security: Common Stock, par value $0.01 per share Ownership: D (Direct) [Holding #2] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F2] Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. [F1] The restricted stock units vest in four equal installments on March 15, 2027, March 15, 2028, March 15, 2029, and March 15, 2030. [F1] The restricted stock units vest in four equal installments on March 15, 2027, March 15, 2028, March 15, 2029, and March 15, 2030. --- Footnotes (Complete Index) --- F1: The restricted stock units vest in four equal installments on March 15, 2027, March 15, 2028, March 15, 2029, and March 15, 2030. F2: Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. --- Signature --- /s/ /s/ Gene Boxer, Attorney-in-Fact (2026-08-04)