CoStar Group awards 26,078 RSUs to accounting chief

CoStar Group, Inc. Chief Accounting Officer Cynthia Cammett received a grant of 26,078 restricted stock units on July 31, 2026, each representing one share of common stock vesting in four equal installments on August 1, 2027, 2028, 2029, and 2030.

Rhea-AI Filing Summary

CoStar Group, Inc. Chief Accounting Officer Cynthia Cammett received a grant of 26,078 restricted stock units on July 31, 2026, each representing one share of common stock vesting in four equal installments on August 1, 2027, 2028, 2029, and 2030.

On August 1, 2026, 1,077 shares of common stock were withheld at $28.76 per share to satisfy tax obligations, leaving her with 23,610 CoStar common shares held directly, in addition to the new RSU award.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Cann Cynthia Cammett

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock, par value $0.01 per share	1,077	$28.76	$31K
Grant/Award	Restricted Stock Units F1, F2	26,078	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 26,078 contracts (Direct); Common Stock, par value $0.01 per share — 23,610 shares (Direct)

Footnotes (2)

1. F1. Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock.
2. F2. The restricted stock units vest in four equal installments on August 1, 2027, August 1, 2028, August 1, 2029, and August 1, 2030.

Key Figures

RSUs granted: 26,078 units Tax withholding shares: 1,077 shares Tax withholding price: $28.76 per share +2 more

5 metrics

RSUs granted 26,078 units Restricted stock units granted on July 31, 2026

Tax withholding shares 1,077 shares Common shares withheld on August 1, 2026 to satisfy tax liability

Tax withholding price $28.76 per share Implied value for 1,077 shares withheld for taxes

Common shares owned after transaction 23,610 shares Direct CoStar common stock holdings after August 1, 2026 withholding

RSUs underlying common stock 26,078 shares Each restricted stock unit represents one share of CoStar common stock

Key Terms

Restricted Stock Units, contingent right, Payment of exercise price or tax liability

3 terms

Restricted Stock Units financial

"The restricted stock units vest in four equal installments on August 1, 2027..."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"Each restricted stock unit represents a contingent right to receive one share..."

Payment of exercise price or tax liability financial

"Payment of exercise price or tax liability by delivering or withholding securities"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What equity award did CoStar Group (CSGP) grant to Cynthia Cammett?

CoStar Group granted Chief Accounting Officer Cynthia Cammett 26,078 restricted stock units. Each unit represents a right to receive one CoStar common share, vesting in four equal annual installments on August 1, 2027, 2028, 2029, and 2030, subject to continued service.

How do the 26,078 RSUs for CoStar Group (CSGP) vest over time?

The 26,078 restricted stock units vest in four equal installments. Vesting dates are August 1, 2027, August 1, 2028, August 1, 2029, and August 1, 2030, aligning the award with multi‑year retention and performance horizons for the Chief Accounting Officer.

Why were 1,077 CoStar Group (CSGP) shares disposed of in this Form 4?

The disposition of 1,077 common shares on August 1, 2026 reflects shares withheld at $28.76 per share to satisfy tax obligations. The transaction uses code F, which denotes payment of an exercise price or tax liability by delivering or withholding securities, not an open‑market sale.

How many CoStar Group (CSGP) shares does Cynthia Cammett hold after these transactions?

After the August 1, 2026 withholding, Cynthia Cammett directly holds 23,610 CoStar common shares. She also holds 26,078 restricted stock units, each representing a contingent right to receive one additional share of CoStar common stock as the units vest over time.

What type of insider activity did CoStar Group (CSGP) report for Cynthia Cammett?

The Form 4 reports a mixed activity: an acquisition of 26,078 RSUs as a compensation grant on July 31, 2026, and a disposition of 1,077 common shares on August 1, 2026, representing shares withheld to cover tax liabilities associated with equity compensation.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/04/2026 - 05:25 PM Accepted by SEC EDGAR 08/04/2026 - 05:24 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^*

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)
07/31/2026

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	08/01/2026		F		1,077	D	$28.76	23,610	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
Restricted Stock Units	(1)	07/31/2026		A		26,078		(2)	(2)	Common Stock, par value $0.01 per share	26,078	$0	26,078	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock.

2. The restricted stock units vest in four equal installments on August 1, 2027, August 1, 2028, August 1, 2029, and August 1, 2030.

Remarks:

	/s/ Gene Boxer, Attorney-in-Fact	08/04/2026
	** 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)