Gene Boxer - 15 Mar 2026 Form 4/A - Amendment Insider Report for COSTAR GROUP, INC. (CSGP)

Reporting relationship: General Counsel and Secretary
Issuer ticker: CSGP
Reported as of: 15 Mar 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 17 Mar 2026, 17:47:58 UTC
Original report date: 17 Mar 2026
Prior SEC filing: 11 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Gene Boxer

Key filing fact

Gene Boxer filed Form 4/A - Amendment for COSTAR GROUP, INC. (CSGP) on 17 Mar 2026.

Key facts

This page summarizes Gene Boxer's Form 4/A - Amendment filing for COSTAR GROUP, INC. (CSGP).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 17 Mar 2026, 17:47.

Change

Previous filing in this sequence was filed on 11 Mar 2026.
Current net transaction value: $0.

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/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001758152 Primary reporting owner

Boxer Gene

Relationship: General Counsel and Secretary
Address: C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON
Signature: /s/ Gene Boxer
Signature date: 17 Mar 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

Tax liability

Transaction value
Shares: -482
Change %: -0.5%
Price: $43.63^*
Shares after: 95,463
Date: 15 Mar 2026
Ownership: Direct
Footnotes: F1, 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

This amount reflects a correction due to administrative error.

Footnote F2

On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63.

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