CoStar Group (CSGP) CEO Andrew Florance buys 55,720 shares

Rhea-AI Filing Summary

CoStar Group, Inc. President and CEO Andrew C. Florance reported an open-market purchase of 55,720 shares of common stock at an average price of $44.52 per share. Following this transaction, his directly held stake increased to 1,586,866.03 shares.

Insider Trade Summary

Net Buyer: 55,720 shares ($2,480,654)

Net Buy 1 txn

Insider FLORANCE ANDREW C

Role President and CEO

Bought 55,720 shs ($2.48M)

Type	Security	Shares	Price	Value
Purchase	Common Stock, par value $0.01 per share	55,720	$44.52	$2.48M

Holdings After Transaction: Common Stock, par value $0.01 per share — 1,586,866.03 shares (Direct)

Footnotes (1)

1. [object Object]

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^*

FLORANCE ANDREW C

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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	02/27/2026		P		55,720	A	$44.52(1)	1,586,866.03	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. Average based on sales prices ranging from $44.08 to $44.74.

Remarks:

	/s/ Gene Boxer, Attorney-in-Fact	03/02/2026
	** 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 transaction did CoStar Group (CSGP) report on this Form 4?

CoStar Group reported that President and CEO Andrew C. Florance bought 55,720 shares of common stock in an open-market transaction at an average price of $44.52 per share, increasing his directly held ownership position.

How many CoStar Group (CSGP) shares does Andrew C. Florance own after this trade?

After the reported purchase, Andrew C. Florance directly owns 1,586,866.03 shares of CoStar Group common stock. This figure reflects his holdings immediately following the 55,720-share open-market acquisition disclosed in the Form 4 filing.

What was the purchase price in Andrew C. Florance’s CoStar Group (CSGP) Form 4 trade?

The reported average purchase price was $44.52 per share. A footnote explains this is an average based on trade prices ranging from $44.08 to $44.74 for the CoStar Group common stock transactions.

Was the CoStar Group (CSGP) insider transaction a buy or a sell?

The transaction was a buy. The Form 4 classifies it as an open-market purchase, with transaction code “P” and a transaction direction labeled as “buy” for 55,720 CoStar Group common shares.

Who is the insider involved in this CoStar Group (CSGP) Form 4 filing?

The insider is Andrew C. Florance, who serves as President and CEO of CoStar Group, Inc. He is listed as both a director and an officer in the Form 4 reporting this open-market stock purchase.