CoStar Group (CSGP) director John Hill offloads 3,500 shares at $30.21

Rhea-AI Filing Summary

CoStar Group, Inc. director John W. Hill reported a sale of 3,500 shares of common stock on 2026-08-05 at $30.21 per share in an open market or private transaction. Following this sale, Hill directly holds 22,993 shares of CoStar Group common stock.

Insider Trade Summary

Net Seller: 3,500 shares

Net Sell 1 txn

Insider Hill John W

Role Director

Sold 3,500 shs ($106K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.01 per share	3,500	$30.21	$106K

Holdings After Transaction: Common Stock, par value $0.01 per share — 22,993 shares (Direct)

Key Figures

Shares sold: 3,500 shares Sale price per share: $30.21 per share Shares held after sale: 22,993 shares

3 metrics

Shares sold 3,500 shares Common stock sale reported for 2026-08-05

Sale price per share $30.21 per share Price for the 3,500 CoStar Group shares sold

Shares held after sale 22,993 shares Direct holdings of John W. Hill following the transaction

Key Terms

Sale in open market or private transaction, Common Stock, par value $0.01 per share, Form 4

3 terms

Sale in open market or private transaction regulatory

"transaction_code_description: Sale in open market or private transaction"

Common Stock, par value $0.01 per share financial

"security_title: Common Stock, par value $0.01 per share"

Form 4 regulatory

"reported on a Form 4 filing by the insider"

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.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/10/2026 - 04:07 PM Accepted by SEC EDGAR 08/10/2026 - 04:06 PM Learn about SEC filing dates

FAQ

What insider transaction did CoStar Group (CSGP) disclose for John W. Hill?

CoStar Group (CSGP) disclosed that director John W. Hill sold 3,500 shares of common stock. The transaction took place on 2026-08-05 and was reported as a sale in an open market or private transaction on a Form 4 filing.

At what price did John W. Hill sell CoStar Group (CSGP) shares?

John W. Hill sold CoStar Group (CSGP) common stock at an average price of $30.21 per share. The Form 4 characterizes the transaction as a sale in open market or private transaction, with the reported price given on a per-share basis.

How many CoStar Group (CSGP) shares does John W. Hill hold after this sale?

After the reported sale, John W. Hill directly holds 22,993 shares of CoStar Group (CSGP) common stock. This post-transaction holding reflects the remaining position after disposing of 3,500 shares in the 2026-08-05 open market or private transaction.

What was the size of John W. Hill’s CoStar Group (CSGP) stock sale?

John W. Hill’s reported transaction involved the sale of 3,500 shares of CoStar Group (CSGP) common stock. Based on the reported price of $30.21 per share, the sale represents a notable but limited portion of his remaining 22,993-share direct stake.

Was John W. Hill’s CoStar Group (CSGP) trade reported under a Rule 10b5-1 plan?

The Form 4 for CoStar Group (CSGP) indicates the Rule 10b5-1 checkbox as not affirmed. This means the sale of 3,500 shares by director John W. Hill was not reported as executed under an affirmative Rule 10b5-1 trading plan.

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^*

Hill John 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)
08/05/2026

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	08/05/2026		S		3,500	D	$30.21	22,993	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	08/10/2026
	** 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)