CoStar Group (NASDAQ: CSGP) marketplaces president buys 20,000 shares

Rhea-AI Filing Summary

CoStar Group, Inc. President, Marketplaces, Frederick G. Saint reported mixed share movements involving the company’s common stock. On March 2, 2026, he made an open-market purchase of 20,000 shares at an average price of $45.33 per share, increasing his directly held stake. On March 1, 2026, 11,096 shares were disposed of to cover tax obligations, using a price of $44.63–$44.63 as referenced in the filing. After these transactions, he directly owned 279,851 shares of CoStar Group common stock.

Insider Trade Summary

Net Buyer: 20,000 shares ($906,600)

Net Buy 2 txns

Insider SAINT FREDERICK G.

Role President, Marketplaces

Bought 20,000 shs ($907K)

Type	Security	Shares	Price	Value
Purchase	Common Stock, par value $0.01 per share	20,000	$45.33	$907K
Tax Withholding	Common Stock, par value $0.01 per share	11,096	$44.63	$495K

Holdings After Transaction: Common Stock, par value $0.01 per share — 279,851 shares (Direct)

Footnotes (1)

1. On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. Average based on sales prices ranging from $45.26 to $45.38

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^*

SAINT FREDERICK G.

(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)
	President, Marketplaces

3. Date of Earliest Transaction (Month/Day/Year)
03/01/2026

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	03/01/2026		F		11,096	D	$44.63(1)	259,851	D
Common Stock, par value $0.01 per share	03/02/2026		P		20,000	A	$45.33(2)	279,851	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 February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63.

2. Average based on sales prices ranging from $45.26 to $45.38

Remarks:

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

FAQ

What insider transactions did CoStar Group (CSGP) report for Frederick G. Saint?

CoStar Group’s President, Marketplaces, Frederick G. Saint reported one open-market purchase and one tax-related share disposition. He bought 20,000 common shares and had 11,096 shares withheld to cover tax obligations on equity compensation.

How many CoStar Group (CSGP) shares did Frederick G. Saint buy and at what price?

Frederick G. Saint purchased 20,000 shares of CoStar Group common stock in the open market. The reported average purchase price was $45.33 per share, based on individual trade prices ranging from $45.26 to $45.38.

What was the nature of Frederick G. Saint’s share disposition in CoStar Group (CSGP)?

The disposition of 11,096 CoStar Group shares was for tax withholding purposes, not an open-market sale. Shares were delivered to satisfy tax liabilities associated with equity awards, using a reference price tied to the company’s recent Nasdaq closing price.

How many CoStar Group (CSGP) shares does Frederick G. Saint own after these transactions?

Following the reported transactions, Frederick G. Saint directly owns 279,851 shares of CoStar Group common stock. This total reflects both the 20,000-share open-market purchase and the 11,096-share tax-withholding disposition reported in the Form 4.

What price information did the CoStar Group (CSGP) Form 4 disclose for these transactions?

The filing reports an average purchase price of $45.33 per share for the 20,000-share buy, with trades between $45.26 and $45.38. It also notes a Nasdaq closing price of $44.63 on February 27, 2026, used in connection with the tax-withholding transaction.