CoStar director granted 8,262 restricted shares

Sams Louise S reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Sams Louise S reported acquisition or exercise transactions in this Form 4 filing.

CoStar Group director Louise S. Sams received a grant of 8,262 shares of restricted common stock at no purchase price. 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, she directly holds 28,671 shares.

Insider Trade Summary

Grant/Award: 8,262 shares

Grant/Award 1 txn

Insider Sams Louise S

Role Director

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

Holdings After Transaction: Common Stock, par value $0.01 per share — 28,671 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Restricted shares granted: 8,262 shares Grant price per share: $0.00 per share Shares after transaction: 28,671 shares +1 more

4 metrics

Restricted shares granted 8,262 shares Restricted stock award to director Louise S. Sams

Grant price per share $0.00 per share Compensation grant with no purchase price

Shares after transaction 28,671 shares Total common stock directly held after grant

Transaction code A Grant, award, or other acquisition of stock

Key Terms

restricted stock award, vests in full, Annual Meeting of Stockholders, Form 4, +1 more

5 terms

restricted stock award financial

"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."

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

Annual Meeting of Stockholders regulatory

"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."

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.

transaction code "A" financial

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

FAQ

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

What did CoStar Group (CSGP) director Louise S. Sams report in this Form 4?

Louise S. Sams reported receiving a grant of 8,262 shares of CoStar Group common stock. The shares are a restricted stock award granted at no purchase price, increasing her direct holdings to 28,671 shares following the transaction.

What type of shares did Louise S. Sams receive from CoStar Group (CSGP)?

She received a restricted stock award of 8,262 shares of CoStar Group common stock. Restricted stock typically vests over time or upon specific events, meaning the holder gains full ownership rights only after the vesting conditions are satisfied.

When do the restricted shares granted to Louise S. Sams at CoStar Group (CSGP) vest?

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. Vesting timing affects when she gains unrestricted ownership of the shares.

How many CoStar Group (CSGP) shares does Louise S. Sams hold after this grant?

After the reported grant, Louise S. Sams directly holds 28,671 shares of CoStar Group common stock. This total includes the newly awarded 8,262 restricted shares, which remain subject to vesting conditions until they fully vest in the future.

Did Louise S. Sams buy CoStar Group (CSGP) shares on the open market?

No, the Form 4 shows a grant or award acquisition coded as “A,” not an open-market purchase. The 8,262 restricted shares were awarded at a price of $0.00 per share, reflecting compensation rather than a discretionary market transaction.

What does transaction code “A” mean in the CoStar Group (CSGP) Form 4 filing?

Transaction code “A” indicates a grant, award, or other acquisition of stock rather than an open-market trade. In this case, Louise S. Sams received 8,262 restricted shares as compensation, which will vest based on the specified vesting schedule.

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

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Accepted by SEC EDGAR 06/24/2026 - 09:13 PM EDT 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^*

Sams Louise S

(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	28,671	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)