Michael J. Desmarais

CIK: 0001925959

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)1 (11.1%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (44.4%)

Compensation grants

Other (G, F, J, C, D, …)4 (44.4%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

CSGP

COSTAR GROUP, INC.

Officer

Discretionary Trading P&L

Holdings

Transaction History (9 total)

CSGP
COSTAR GROUP, INC.
Mar 15, 2026
Tax Payment(F)
Direct
2.9K shares at avg. $43.63$125K
CSGP
COSTAR GROUP, INC.
Mar 10, 2026
Award(A)
Direct
17.7K shares-
CSGP
COSTAR GROUP, INC.
Mar 1, 2026
Tax Payment(F)
Direct
6.4K shares at avg. $44.63$284K
CSGP
COSTAR GROUP, INC.
Feb 27, 2026
Award(A)
Restricted Stock Units
Direct
17.9K shares-
CSGP
COSTAR GROUP, INC.
Mar 15, 2025
Tax Payment(F)
Direct
3.6K shares at avg. $78.73$287K
CSGP
COSTAR GROUP, INC.
Mar 5, 2025
Award(A)
Direct
9K shares-
CSGP
COSTAR GROUP, INC.
Mar 1, 2025
Tax Payment(F)
Direct
3.9K shares at avg. $76.25$297K
CSGP
COSTAR GROUP, INC.
Feb 27, 2025
Award(A)
Direct
18.8K shares-
CSGP
COSTAR GROUP, INC.
Nov 26, 2024
Sale(S)
Direct
5.5K shares at avg. $79.88$439K

		Type	Shares	Price		Ownership
Mar 15, 2026	CSGP COSTAR GROUP, INC.	Tax Payment(F)	2,873	$43.63	$125,349	Direct
Mar 10, 2026	CSGP COSTAR GROUP, INC.	Award(A)	17,676	-	$0	Direct
Mar 1, 2026	CSGP COSTAR GROUP, INC.	Tax Payment(F)	6,353	$44.63	$283,534	Direct
Feb 27, 2026	CSGP COSTAR GROUP, INC.	Award(A) Restricted Stock Units	17,926	-	-	Direct
Mar 15, 2025	CSGP COSTAR GROUP, INC.	Tax Payment(F)	3,641	$78.73	$286,656	Direct
Mar 5, 2025	CSGP COSTAR GROUP, INC.	Award(A)	9,026	-	-	Direct
Mar 1, 2025	CSGP COSTAR GROUP, INC.	Tax Payment(F)	3,893	$76.25	$296,841	Direct
Feb 27, 2025	CSGP COSTAR GROUP, INC.	Award(A)	18,828	-	-	Direct
Nov 26, 2024	CSGP COSTAR GROUP, INC.	Sale(S)	5,500	$79.88	$439,340	Direct

1-9 of 9 transactions

About DESMARAIS MICHAEL J

DESMARAIS MICHAEL J (SEC CIK 0001925959) files insider reports with the SEC as Chief Human Resources Officer of COSTAR GROUP, INC. (CSGP).

Signal8 holds 7 ownership filings by DESMARAIS MICHAEL J, all Form 4s, filed between Nov 27, 2024 and Mar 17, 2026. Those filings report 9 transactions, from Nov 26, 2024 to Mar 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on DESMARAIS MICHAEL J's filings is in ARLINGTON, VA.

Recent filings by DESMARAIS MICHAEL J

Mar 15, 2026: Tax withholding of CSGP shares (Form 4, code F).
Mar 10, 2026: Grant or award of CSGP shares (Form 4, code A).
Mar 1, 2026: Tax withholding of CSGP shares (Form 4, code F).
Feb 27, 2026: Grant or award of CSGP derivative securities (Form 4, code A).
Mar 15, 2025: Tax withholding of CSGP shares (Form 4, code F).

Other insiders filing for COSTAR GROUP, INC. (CSGP)

Rossmann Robin Jack, Chief Financial Officer
Cann Cynthia Cammett, Chief Accounting Officer
Hill John W, Director
FLORANCE ANDREW C, Founder and CEO
SAINT FREDERICK G., President, Marketplaces
LOWN CHRISTIAN M., Chief Financial Officer

How to read Form 4 transaction codes