CoStar Group (CSGP) CAO sells 4,788 shares at $30.78 each

Rhea-AI Filing Summary

COSTAR GROUP, INC. Chief Accounting Officer Cynthia Cammett Cann reported a sale of 4,788 shares of common stock on 2026-08-07 in an open market or private transaction at $30.78 per share. Following this transaction, she holds 18,822 shares of CoStar Group common stock directly.

Insider Trade Summary

Net Seller: 4,788 shares

Net Sell 1 txn

Insider Cann Cynthia Cammett

Role Chief Accounting Officer

Sold 4,788 shs ($147K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.01 per share	4,788	$30.78	$147K

Holdings After Transaction: Common Stock, par value $0.01 per share — 18,822 shares (Direct)

Key Figures

Shares sold: 4,788 shares Sale price per share: $30.78 per share Shares held after transaction: 18,822 shares

3 metrics

Shares sold 4,788 shares Common stock sale on 2026-08-07 by Chief Accounting Officer

Sale price per share $30.78 per share Price for the 4,788 CoStar Group common shares sold

Shares held after transaction 18,822 shares Direct ownership by the CAO following the reported sale

Key Terms

open market or private transaction, Common Stock, par value $0.01 per share, Chief Accounting Officer

3 terms

open market or private transaction financial

"transaction code description states it was a sale in an open market or private transaction"

Common Stock, par value $0.01 per share financial

"security title is listed as Common Stock, par value $0.01 per share"

Chief Accounting Officer financial

"reporting person serves as Chief Accounting Officer of the company"

A chief accounting officer is a senior executive responsible for overseeing a company's financial records and ensuring all accounting practices are accurate and compliant with regulations. They play a key role in preparing financial reports that help investors understand the company's financial health, much like a trusted navigator guiding a ship through complex waters. Their work ensures transparency and trust in the company's financial information.

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

FAQ

What insider transaction did CoStar Group (CSGP) report?

CoStar Group reported that Chief Accounting Officer Cynthia Cammett Cann sold 4,788 shares of common stock on 2026-08-07 in an open market or private transaction at $30.78 per share.

How many CoStar Group (CSGP) shares did the CAO sell and at what price?

Chief Accounting Officer Cynthia Cammett Cann sold 4,788 CoStar Group shares at a price of $30.78 per share. The transaction involved the company’s common stock with a par value of $0.01 per share.

What are the CoStar Group (CSGP) CAO’s holdings after this Form 4 sale?

After the reported sale, Chief Accounting Officer Cynthia Cammett Cann directly holds 18,822 shares of CoStar Group common stock. This reflects her post-transaction ownership as disclosed in the Form 4 filing.

What security was involved in the CoStar Group (CSGP) insider sale?

The transaction involved CoStar Group’s Common Stock, par value $0.01 per share. The Chief Accounting Officer sold 4,788 shares at $30.78 per share in an open market or private transaction.

Was the CoStar Group (CSGP) insider trade reported as a purchase or a sale?

The transaction was reported as a sale of common stock. The Form 4 lists transaction code “S”, indicating a sale in an open market or private transaction of 4,788 shares at $30.78 per share.

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^*

Cann Cynthia Cammett

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/07/2026

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	08/07/2026		S		4,788	D	$30.78	18,822	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)