CoStar Group (CSGP) CAO covers tax liability with 461 company shares

Rhea-AI Filing Summary

CoStar Group’s Chief Accounting Officer Cynthia Cammett reported a routine tax-withholding transaction. On June 15, 2026, 461 shares of common stock were disposed of at $32.04 per share to cover tax obligations. After this non-market event, she directly holds 24,687 shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Cann Cynthia Cammett

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock, par value $0.01 per share	461	$32.04	$15K

Holdings After Transaction: Common Stock, par value $0.01 per share — 24,687 shares (Direct, null)

Footnotes (1)

Key Figures

Tax-withholding shares: 461 shares Reference price: $32.04 per share Post-transaction holdings: 24,687 shares +1 more

4 metrics

Tax-withholding shares 461 shares Disposed on June 15, 2026 to cover taxes

Reference price $32.04 per share Price used for the 461-share tax-withholding disposition

Post-transaction holdings 24,687 shares Directly held by Cynthia Cammett after the transaction

Tax-withholding count 1 transaction Single tax-withholding event reported in this Form 4

Key Terms

tax-withholding disposition, Payment of exercise price or tax liability by delivering securities, Common Stock, par value $0.01 per share, direct ownership

4 terms

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Payment of exercise price or tax liability by delivering securities financial

"transaction_code_description: "Payment of exercise price or tax liability by delivering securities""

Common Stock, par value $0.01 per share financial

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

direct ownership financial

"ownership_type: "direct" and ownership_code: "D""

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Form 4 Insider Transactions: What Each Field Means →

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)
06/15/2026

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	06/15/2026		F		461	D	$32.04	24,687	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	06/16/2026
	** 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)

FAQ

What insider transaction did CoStar Group (CSGP) report for Cynthia Cammett?

CoStar Group reported that Chief Accounting Officer Cynthia Cammett had 461 shares of common stock disposed of to satisfy tax obligations. This Form 4 event reflects tax withholding, not an open-market sale or purchase of CoStar Group shares.

How many CoStar Group (CSGP) shares were used for tax withholding?

A total of 461 CoStar Group common shares were used for tax withholding at a reference price of $32.04 per share. This transaction is coded as a tax-withholding disposition rather than a discretionary buy or sell in the market.

How many CoStar Group (CSGP) shares does Cynthia Cammett hold after this transaction?

Following the tax-withholding disposition, Cynthia Cammett directly holds 24,687 CoStar Group common shares. This figure represents her reported direct ownership after 461 shares were withheld to cover tax liabilities associated with equity compensation.

Was the CoStar Group (CSGP) insider transaction a market sale or purchase?

The transaction was not a market sale or open-market purchase. It is classified as a tax-withholding disposition, meaning shares were delivered to cover tax liabilities, a common administrative step for equity awards rather than a discretionary trade.

What does transaction code F mean for CoStar Group (CSGP) insiders?

Transaction code F indicates payment of exercise price or tax liability by delivering securities. For CoStar Group, Cynthia Cammett’s 461-share event reflects shares withheld for taxes, not a typical buy or sell order executed on the open market.