CoStar Group (CSGP) director receives 8,262-share restricted stock award, now holds 26,539

Rhea-AI Filing Summary

Musslewhite Robert W reported acquisition or exercise transactions in this Form 4 filing.

COSTAR GROUP, INC. director Robert W. Musslewhite received an equity grant of 8,262 shares of common stock as a restricted stock award. The award was granted at no cash cost to him and increases his direct holdings to 26,539 shares. According to the terms, the restricted stock vests in full on the earlier of the first anniversary of the grant date or the date of the company’s 2027 Annual Meeting of Stockholders, tying his compensation more closely to the company’s future performance and continued board service.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Musslewhite Robert W

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	8,262	$0.00	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 26,539 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Restricted stock granted: 8,262 shares Grant price: $0.00 per share Shares owned after grant: 26,539 shares +1 more

4 metrics

Restricted stock granted 8,262 shares Common Stock award on June 23, 2026

Grant price $0.00 per share Equity compensation, no cash paid by director

Shares owned after grant 26,539 shares Director’s direct holdings following the award

Vesting condition Earlier of 1-year anniversary or 2027 meeting Full vesting trigger for restricted stock award

Key Terms

restricted stock award, vests in full, Annual Meeting of Stockholders, Common Stock, par value $0.01 per share

4 terms

restricted stock award financial

"The restricted stock award vests in full on the earlier of either the first anniversary of the grant date"

A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.

vests in full financial

"The restricted stock award vests in full on the earlier of either the first anniversary"

Annual Meeting of Stockholders financial

"the date of the Company's 2027 Annual Meeting of Stockholders"

Common Stock, par value $0.01 per share financial

"Common Stock, par value $0.01 per share"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/24/2026 - 09:14 PM Accepted by SEC EDGAR 06/24/2026 - 09:13 PM Learn about SEC filing dates

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^*

Musslewhite Robert W

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/23/2026

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
Common Stock, par value $0.01 per share	06/23/2026		A		8,262(1)	A	$0	26,539	D

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

Explanation of Responses:

1. The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders.

Remarks:

	/s/ Gene Boxer, Attorney-in-Fact	06/24/2026
	** 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)

FAQ

What insider transaction did CoStar Group (CSGP) report for Robert W. Musslewhite?

CoStar Group reported that director Robert W. Musslewhite received a grant of 8,262 shares of common stock as a restricted stock award. This is a compensation-related equity grant, not an open-market purchase or sale, and increases his direct ownership stake in the company.

How many CoStar Group (CSGP) shares does Robert W. Musslewhite own after this Form 4?

After the reported transaction, Robert W. Musslewhite directly holds 26,539 shares of CoStar Group common stock. This total reflects the addition of the 8,262 restricted shares granted in the award, which are subject to future vesting conditions tied to time and board service.

What are the vesting terms of Robert W. Musslewhite’s restricted stock award at CoStar Group (CSGP)?

The restricted stock award vests in full on the earlier of the first anniversary of the grant date or the date of CoStar Group’s 2027 Annual Meeting of Stockholders. Until vesting, the shares remain subject to forfeiture conditions typically linked to continued service on the board.

Did Robert W. Musslewhite pay cash for the CoStar Group (CSGP) shares reported in this Form 4?

No, the 8,262 shares were received as a restricted stock award at a reported price of $0.00 per share. This reflects a stock-based compensation grant from CoStar Group, rather than an open-market purchase funded with cash by the director.

Is the CoStar Group (CSGP) Form 4 for Robert W. Musslewhite a buy or sell signal?

The Form 4 reflects an acquisition through a grant of restricted stock, coded as a compensation-related award. It is not an open-market buy or sell decision, but part of the director’s equity-based compensation structure aligned with ongoing board service and future company performance.