CoStar Group director proposes $92.6K share sale

Available on EDGAR 11/12/2026 - 01:14 PM EST Accepted by SEC EDGAR 11/12/2026 - 01:13 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

CoStar Group, Inc. (CSGP) director John W. Hill reported a proposed sale of 3,050 common shares, with an aggregate market value of $92,600 and an approximate sale date of November 12, 2026. The notice lists 423,000,000 shares outstanding and names Ameritas Investment Corp. as broker.

Key Figures

Shares proposed for sale: 3,050 shares Aggregate market value: $92,600 Shares outstanding: 423,000,000 shares

3 metrics

Shares proposed for sale 3,050 shares CoStar common shares listed in the notice

Aggregate market value $92,600 Shares proposed for sale

Shares outstanding 423,000,000 shares CoStar shares outstanding, as listed in the notice

Key Terms

Aggregate Market Value

1 terms

Aggregate Market Value financial

"Aggregate Market Value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

How many CoStar (CSGP) shares does director John W. Hill propose to sell?

John W. Hill reported a proposed sale of 3,050 common shares, with an aggregate market value of $92,600. The notice gives an approximate sale date of November 12, 2026.

How did John W. Hill acquire the CoStar shares listed for sale?

The listed shares were acquired from CoStar as payment for services rendered: 320 shares on August 1, 2026; 947 shares and 794 shares on September 15, 2026; and 989 shares on November 6, 2026.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001351689
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	COSTAR GROUP, INC.
SEC File Number	000-24531
Address of Issuer	1201 WILSON BLVD. ARLINGTON VIRGINIA 22209
Phone	2023466500
Name of Person for Whose Account the Securities are To Be Sold	Hill John W
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Ameritas Investment Corp 5900 O Street Lincoln NE 68501	3050	92600.00	423000000	11/12/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/01/2026	Payment for services rendered	Costar			320	08/01/2026	Compensation
Common	09/15/2026	Payment for services rendered	Costar			947	09/15/2026	Compensation
Common	09/15/2026	Payment for services rendered	Costar			794	09/15/2026	Compensation
Common	11/06/2026	Payment for services rendered	Costar			989	11/06/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	11/12/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Daniel Gardea as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for Hill John W.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)