CoStar (CSGP) director Christine McCarthy receives 8,262-share stock award

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

McCarthy Christine M reported acquisition or exercise transactions in this Form 4 filing.

COSTAR GROUP, INC. director Christine M. McCarthy received a grant of 8,262 shares of common stock as a restricted stock award. The award vests in full on the earlier of the first anniversary of the grant date or the Company’s 2027 Annual Meeting of Stockholders. After this grant and the inclusion of shares that were inadvertently omitted from a prior filing, she directly holds 11,585 shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider McCarthy Christine M

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 — 11,585 shares (Direct, null)

Footnotes (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. This amount includes shares that were inadvertently omitted from the insider's prior filing.

Key Figures

Restricted shares granted: 8,262 shares Holdings after transaction: 11,585 shares Grant price per share: $0.00 per share +2 more

5 metrics

Restricted shares granted 8,262 shares Grant/award acquisition on 2026-06-23

Holdings after transaction 11,585 shares Direct ownership following grant

Grant price per share $0.00 per share Reported transaction price for restricted stock award

Vesting trigger First anniversary or 2027 meeting Vests on earlier of first anniversary of grant or 2027 Annual Meeting of Stockholders

Transaction code Code A Classified as grant, award, or other acquisition

Key Terms

restricted stock award, Annual Meeting of Stockholders, grant, award, or other acquisition, Form 4

4 terms

restricted stock award financial

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

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.

Annual Meeting of Stockholders regulatory

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

grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/24/2026 - 09:13 PM Accepted by SEC EDGAR 06/24/2026 - 09:12 PM

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^*

McCarthy Christine M

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, par value $0.01 per share	06/23/2026		A		8,262⁽¹⁾	A	$0	11,585⁽²⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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.

2. This amount includes shares that were inadvertently omitted from the insider's prior filing.

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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did COSTAR GROUP (CSGP) report for Christine M. McCarthy?

Christine M. McCarthy received a grant of 8,262 shares of CoStar common stock. The filing describes this as a restricted stock award granted at no cash cost per share, increasing her directly held position to 11,585 shares after the transaction and adjustments.

How many COSTAR GROUP (CSGP) shares does Christine M. McCarthy hold after this Form 4?

After the reported grant, Christine M. McCarthy directly holds 11,585 CoStar shares. This total reflects the new 8,262-share restricted stock award as well as shares that the filing notes were inadvertently omitted from her prior ownership report.

What are the vesting terms of Christine M. McCarthy’s COSTAR GROUP restricted stock award?

The restricted stock award vests in full on a single future date. Vesting occurs on the earlier of the first anniversary of the grant date or the date of CoStar Group’s 2027 Annual Meeting of Stockholders, aligning the award with the company’s governance calendar.

Was Christine M. McCarthy’s COSTAR GROUP (CSGP) grant an open-market purchase?

No, the Form 4 classifies the transaction as a grant or award acquisition. The 8,262 shares were received as a restricted stock award at a reported price of $0.00 per share, indicating compensation rather than an open-market share purchase or sale.

Does the COSTAR GROUP (CSGP) Form 4 mention corrections to prior insider holdings for Christine M. McCarthy?

Yes, the filing notes that the reported holdings include previously omitted shares. A footnote explains that some shares were inadvertently left out of an earlier filing, and the current total of 11,585 shares now reflects those shares plus the new award.