CoStar Group (CSGP) CFO has shares withheld to cover equity taxes

Rhea-AI Filing Summary

CoStar Group, Inc. Chief Financial Officer Christian M. Lown reported a tax-withholding disposition of company stock. On this Form 4, 5,597 shares of common stock were delivered at $29.36 per share to satisfy tax obligations tied to equity compensation. Following this transaction, he continues to hold 129,653 shares of CoStar Group common stock directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider LOWN CHRISTIAN M.

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock, par value $0.01 per share	5,597	$29.36	$164K

Holdings After Transaction: Common Stock, par value $0.01 per share — 129,653 shares (Direct, null)

Footnotes (1)

Key Figures

Tax-withholding shares: 5,597 shares Price per share: $29.36 per share Shares held after transaction: 129,653 shares

3 metrics

Tax-withholding shares 5,597 shares Shares delivered to satisfy tax obligations on equity compensation

Price per share $29.36 per share Value used for the tax-withholding disposition

Shares held after transaction 129,653 shares Direct CoStar Group common stock holdings after the Form 4 event

Key Terms

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

3 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.

Common Stock, par value $0.01 per share financial

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

Payment of exercise price or tax liability by delivering securities financial

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/06/2026 - 04:06 PM Accepted by SEC EDGAR 07/06/2026 - 04:05 PM 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^*

LOWN CHRISTIAN M.

(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 Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

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	07/01/2026		F		5,597	D	$29.36	129,653	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/ Lisa M. Tanzi, Attorney-in-Fact	07/06/2026
	** 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 its CFO?

CoStar Group’s CFO Christian M. Lown reported a tax-withholding disposition of 5,597 common shares. The shares were delivered to cover tax obligations related to equity compensation, rather than sold in the open market, and he retained 129,653 shares afterward.

Was the CoStar Group (CSGP) CFO’s Form 4 transaction an open-market sale?

No, the transaction was a tax-withholding disposition, not an open-market sale. Shares valued at $29.36 each were delivered to satisfy tax obligations from equity compensation, while the CFO maintained direct ownership of 129,653 CoStar Group common shares.

How many CoStar Group (CSGP) shares were used for the CFO’s tax withholding?

The Form 4 shows 5,597 CoStar Group common shares were delivered for tax withholding. These shares, priced at $29.36 each, covered the exercise price or tax liability associated with equity awards granted to Chief Financial Officer Christian M. Lown.

How many CoStar Group (CSGP) shares does the CFO hold after this Form 4?

After the reported tax-withholding disposition, CoStar Group’s CFO directly holds 129,653 common shares. This post-transaction figure reflects his continuing ownership stake following the delivery of 5,597 shares to cover tax-related obligations on equity compensation.

What does transaction code "F" mean in the CoStar Group (CSGP) Form 4?

Transaction code “F” indicates payment of an exercise price or tax liability by delivering securities. In this CoStar Group filing, 5,597 shares were used to settle tax obligations, rather than being sold on the market, as part of routine equity award administration.