[Form 4] CoStar Group Inc Insider Trading Activity

Rhea-AI Filing Summary

CoStar Group, Inc. (CSGP) director John L. Berisford reported acquiring 2,973 shares of CoStar common stock on 09/09/2025. The transaction is coded "A" and shows a price of $0 per share, with 2,973 shares reported as beneficially owned following the transaction. The Form 4 was filed as a single reporting person filing and includes an electronic signature executed by Gene Boxer, Attorney-in-Fact, dated 09/11/2025. The reporting address is listed as C/O CoStar Group, Inc., 1201 Wilson Blvd., Arlington, VA 22209. No derivative securities or additional transactions are reported on this Form 4.

Insights

Securities Analyst

TL;DR: Director reported a small non-derivative acquisition of 2,973 CoStar shares; filing is routine and contains no additional disclosures.

The Form 4 records a direct acquisition (code "A") of 2,973 shares by Director John L. Berisford with a reported price of $0 and resulting beneficial ownership of 2,973 shares. The report contains no derivative positions, no dispositions, and no indications of a planned Rule 10b5-1 plan. The filing appears procedural and does not disclose material corporate events, compensation details, or sizeable ownership changes that would typically alter an investor thesis.

Corporate Governance Specialist

TL;DR: A routine Section 16 filing showing a director-level share acquisition; documentation and signature are in order.

The Form 4 is completed with issuer and reporting person details, relationship (Director), transaction date, and the number of shares acquired. The presence of an Attorney-in-Fact signature is noted. There are no explanatory remarks attached and no amendments. From a governance and disclosure perspective, the filing meets disclosure requirements but provides no additional context such as grant origin, vesting, or related-party arrangements.

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^*

BERISFORD JOHN L

(Last) (First) (Middle)

C/O COSTAR GROUP, INC.

1201 WILSON BLVD.

(Street)

ARLINGTON VA 22209

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2025

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

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

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

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	09/09/2025		A		2,973	A	$0	2,973	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:

Remarks:

	/s/ Gene Boxer, Attorney-in-Fact	09/11/2025
	** 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.

FAQ

What transaction did John L. Berisford report on the CoStar Group (CSGP) Form 4?

The Form 4 reports a direct acquisition of 2,973 shares of CoStar common stock on 09/09/2025.

What price per share was reported for the transaction on the Form 4?

The transaction is reported with a price of $0 per share on the Form 4.

What is John L. Berisford's relationship to CoStar Group in this filing?

The filing lists John L. Berisford as a Director of CoStar Group, Inc.

Were any derivative securities reported on this Form 4 for CSGP?

No. The Form 4 contains no derivative securities in Table II; only the non-derivative acquisition is reported.

Who signed and filed the Form 4 for this transaction?

The Form 4 bears the electronic signature of Gene Boxer, Attorney-in-Fact, dated 09/11/2025.