Key facts
- This page summarizes Michael J. Desmarais's Form 4 filing for COSTAR GROUP, INC. (CSGP).
- 2 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 03 Mar 2026, 19:06.
Michael J. Desmarais - 27 Feb 2026 Form 4 Insider Report for COSTAR GROUP, INC. (CSGP)
- Reporting relationship
- Chief Human Resources Officer
- Issuer ticker
- CSGP
- Reported as of
- 27 Feb 2026
- Net transaction value
- -$283,534
- SEC form
- 4
- Accepted by SEC
- 03 Mar 2026, 19:06:17 UTC
- Prior SEC filing
- 18 Mar 2025
- Next SEC filing
- 11 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Gene Boxer, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Michael J. Desmarais filed Form 4 for COSTAR GROUP, INC. (CSGP) on 03 Mar 2026.
Change
- Previous filing in this sequence was filed on 18 Mar 2025.
- Current net transaction value: -$283,534.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001925959
Primary reporting owner
DESMARAIS MICHAEL J
- Relationship
- Chief Human Resources Officer
- Address
- C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON
- Signature
- /s/ Gene Boxer, Attorney-in-Fact
- Signature date
- 03 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
- $283,534
- Shares
- -6,353
- Change %
- -8%
- Price
- $44.63
- Shares after
- 72,922
- Date
- 01 Mar 2026
- Ownership
- Direct
- Footnotes
- F1, F2
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
CSGP
transaction
Derivative
Restricted Stock Units
Award
- Transaction value
- $0
- Shares
- +17,926
- Change %
- Price
- $0.000000
- Shares after
- 17,926
- Date
- 27 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock, par value $0.01 per share
- Underlying amount
- 17,926
- Exercise price
- Footnotes
- F3, F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 4 footnotes
Footnote F1
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63.
Footnote F2
Includes 157 shares acquired under the CoStar Group, Inc. Employee Stock Purchase Plan.
Footnote F3
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock.
Footnote F4
The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029.
SEC remarks
Exhibit 24 - Power of Attorney