Christian M. Lown - 27 Feb 2026 Form 4 Insider Report for COSTAR GROUP, INC. (CSGP)

Role
Chief Financial Officer
Signature
/s/ Gene Boxer, Attorney-in-Fact
Issuer symbol
CSGP
Transactions as of
27 Feb 2026
Net transactions value
-$320,220
Form type
4
Filing time
03 Mar 2026, 19:06:40 UTC
Previous filing
02 Jul 2025
Next filing
11 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
LOWN CHRISTIAN M. Chief Financial Officer C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON /s/ Gene Boxer, Attorney-in-Fact 03 Mar 2026 0001701994

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 $320,220 -7,175 -5.5% $44.63 122,982 01 Mar 2026 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 Restricted Stock Units Award $0 +39,652 $0.000000 39,652 27 Feb 2026 Common Stock, par value $0.01 per share 39,652 Direct F2, F3
* 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 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.

Remarks:

Exhibit 24 - Power of Attorney