Andrew C. Florance - 01 May 2026 Form 4 Insider Report for COSTAR GROUP, INC. (CSGP)

Reporting relationship: President and CEO, Director
Issuer ticker: CSGP
Reported as of: 01 May 2026
Net transaction value: +$2,514,208
SEC form: 4
Accepted by SEC: 04 May 2026, 06:01:03 UTC
Prior SEC filing: 11 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Gene Boxer, Attorney-in-Fact

Key filing fact

Andrew C. Florance filed Form 4 for COSTAR GROUP, INC. (CSGP) on 04 May 2026.

Key facts

This page summarizes Andrew C. Florance's Form 4 filing for COSTAR GROUP, INC. (CSGP).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 04 May 2026, 06:01.

Change

Previous filing in this sequence was filed on 11 Mar 2026.
Current net transaction value: +$2,514,208.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001066061 Primary reporting owner

FLORANCE ANDREW C

Relationship: President and CEO, Director
Address: C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON
Signature: /s/ Gene Boxer, Attorney-in-Fact
Signature date: 04 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CSGP transaction

Common Stock, par value $0.01 per share

Purchase

Transaction value: $2,403,166
Shares: +68,330
Change %: +4.1%
Price: $35.17
Shares after: 1,719,765
Date: 01 May 2026
Ownership: Direct
Footnotes: F1

CSGP transaction

Common Stock, par value $0.01 per share

Purchase

Transaction value: $111,042
Shares: +3,100
Change %: +0.18%
Price: $35.82
Shares after: 1,722,865
Date: 01 May 2026
Ownership: Direct
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Average based on sales prices ranging from $34.67 to $35.67.

Footnote F2

Average based on sales prices ranging from $35.68 to $36.00.

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