CoStar Group (CSGP) SVP reports 2,977-share tax-withholding transaction

Rhea-AI Filing Summary

CoStar Group Senior VP Lisa Ruggles reported a routine tax-withholding transaction involving company stock. On March 15, 2026, 2,977 shares of common stock were disposed of at $43.63 per share to cover tax obligations tied to equity compensation. After this non-market transaction, she directly holds 174,915 shares of CoStar Group common stock.

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

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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^*

Ruggles Lisa

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior VP, Global Operations

3. Date of Earliest Transaction (Month/Day/Year)
03/15/2026

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	03/15/2026		F		2,977	D	$43.63(1)	174,915	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:

1. On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63.

Remarks:

	/s/ Gene Boxer, Attorney-in-Fact	03/17/2026
	** 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).
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FAQ

What did CoStar Group (CSGP) executive Lisa Ruggles report in this Form 4?

Lisa Ruggles reported a tax-withholding disposition of CoStar Group common stock. The transaction covered tax obligations from equity compensation and did not represent an open-market purchase or sale. It reflects required share withholding rather than a discretionary trading decision.

How many CoStar Group (CSGP) shares were withheld for taxes in Lisa Ruggles’ filing?

The filing shows 2,977 shares of CoStar Group common stock were disposed of for tax withholding. These shares were used to satisfy tax liabilities related to stock-based compensation, rather than being sold as part of an elective trading strategy in the open market.

What is Lisa Ruggles’ CoStar Group (CSGP) share ownership after this Form 4 transaction?

Following the tax-withholding disposition, Lisa Ruggles directly owns 174,915 shares of CoStar Group common stock. This reflects her remaining stake after 2,977 shares were delivered to satisfy tax obligations associated with her equity compensation awards.

Was Lisa Ruggles’ CoStar Group (CSGP) transaction an open-market sale of shares?

No, the transaction was a tax-withholding disposition, not an open-market sale. Shares were delivered to cover tax liabilities tied to equity compensation, a common administrative process that does not reflect an elective buy or sell decision in the market.

At what price were the CoStar Group (CSGP) shares valued for Lisa Ruggles’ tax withholding?

The 2,977 shares were valued at $43.63 per share for the tax-withholding disposition. A footnote notes that this price matched the Nasdaq closing price of CoStar Group common stock on March 13, 2026, the last preceding business day.

What role does Lisa Ruggles hold at CoStar Group (CSGP) in this Form 4?

In this Form 4, Lisa Ruggles is identified as Senior Vice President, Global Operations of CoStar Group. Her reported transaction involves company common stock used to satisfy tax obligations stemming from her executive equity compensation.