CoStar Group grants 34,771 RSUs to CFO

Rossmann Robin Jack reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 08/04/2026 - 05:24 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Rossmann Robin Jack reported acquisition or exercise transactions in this Form 4 filing.

CoStar Group, Inc. granted Chief Financial Officer Robin Jack Rossmann 34,771 restricted stock units on July 31, 2026. Each unit represents a contingent right to receive one share of common stock. The award vests in three equal installments on August 1, 2027, 2028 and 2029, and Rossmann now directly holds 34,771 RSUs.

Insider Trade Summary

Grant/Award: 34,771 shares

Grant/Award 1 txn

Insider Rossmann Robin Jack

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1, F2	34,771	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 34,771 contracts (Direct)

Footnotes (2)

1. F1. Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock.
2. F2. The restricted stock units vest in three equal installments on August 1, 2027, August 1, 2028 and August 1, 2029.

Key Figures

RSUs granted: 34,771 units Transaction price per unit: $0.00 per unit Underlying common shares: 34,771 shares +4 more

7 metrics

RSUs granted 34,771 units Restricted stock units granted on July 31, 2026 to the Chief Financial Officer

Transaction price per unit $0.00 per unit Reported transaction price per restricted stock unit in the award

Underlying common shares 34,771 shares Each restricted stock unit represents a contingent right to one share of common stock

Holdings after grant 34,771 units Total restricted stock units held directly by the CFO following the transaction

Vesting date 1 August 1, 2027 First one-third of the restricted stock units scheduled to vest

Vesting date 2 August 1, 2028 Second one-third of the restricted stock units scheduled to vest

Vesting date 3 August 1, 2029 Final one-third of the restricted stock units scheduled to vest

Key Terms

Restricted Stock Units, contingent right, vesting

3 terms

Restricted Stock Units financial

"Security title reported as Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"represents a contingent right to receive one share"

vesting financial

"restricted stock units vest in three equal installments"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did CoStar Group (CSGP) report for its CFO?

CoStar Group’s Chief Financial Officer, Robin Jack Rossmann, was granted 34,771 restricted stock units on July 31, 2026. Each unit is a contingent right to receive one share of CoStar Group common stock, vesting over three years starting August 1, 2027.

How many CoStar Group (CSGP) shares underlie the CFO’s new RSU grant?

The grant covers 34,771 restricted stock units, and each unit corresponds to one share of CoStar Group common stock. In total, the award represents rights over 34,771 shares, subject to the specified vesting schedule through 2029.

What is the vesting schedule for CoStar Group (CSGP) CFO Rossmann’s RSUs?

The 34,771 restricted stock units vest in three equal installments. Vesting occurs on August 1, 2027, August 1, 2028, and August 1, 2029, so one-third of the units becomes deliverable as common stock on each of those dates.

What price is associated with the CoStar Group (CSGP) CFO’s RSU award?

The award was reported with a transaction price of $0.00 per restricted stock unit. RSUs are equity compensation, so there is no purchase price; each vested unit entitles the holder to receive one share of common stock without additional cash payment.

How many CoStar Group (CSGP) RSUs does the CFO hold after this transaction?

Following this grant, Chief Financial Officer Robin Jack Rossmann directly holds 34,771 restricted stock units. These RSUs, once vested on the scheduled dates, can each settle into one share of CoStar Group common stock, increasing his equity-based compensation exposure.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Rossmann Robin Jack

(Last) (First) (Middle)

C/O COSTAR GROUP, INC.

1201 WILSON BLVD.

(Street)

ARLINGTON VIRGINIA 22209

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
COSTAR GROUP, INC. [ CSGP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	07/31/2026		A		34,771		(2)	(2)	Common Stock, par value $0.01 per share	34,771	$0	34,771	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock.

2. The restricted stock units vest in three equal installments on August 1, 2027, August 1, 2028 and August 1, 2029.

Remarks:

	/s/ Gene Boxer, Attorney-in-Fact	08/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)