[144] CoStar Group Inc SEC Filing

Rhea-AI Filing Summary

CoStar Group Inc (CSGP) Form 144 summary: This Form 144 notifies a proposed sale of 25,000 shares of CoStar common stock through Morgan Stanley Smith Barney, scheduled approximately 08/28/2025, with an aggregate market value listed as $2,258,225.00 and total outstanding shares of 423,650,362.

The filing identifies the seller as Frederick Saint and discloses prior sales by the same person of 25,000 shares on 07/28/2025 for $2,330,827.51 and 25,000 shares on 06/11/2025 for $2,027,382.51. Acquisition details show the shares being sold were originally received as restricted stock on multiple dates in 2021 and 2022.

Positive

• Disclosure completeness: Filing lists broker, number of shares, aggregate market value, outstanding shares, and acquisition history.
• Prior sales documented: Shares sold on 06/11/2025 and 07/28/2025 are disclosed with gross proceeds, supporting transparency.

Negative

• Insider selling concentration: The filer sold or plans to sell 75,000 shares within a three-month window (25,000 each in June, July, August 2025).
• No 10b5-1 plan details provided: The filing does not state a trading-plan adoption date or provide specific trading-plan terms.

Insights

Securities Analyst

TL;DR Insider Frederick Saint plans to sell 25,000 CSGP shares; similar sized sales occurred in June and July 2025.

The filing is a routine Form 144 disclosure showing an insider sale through a broker with clear acquisition history (restricted stock grants from 2021–2022). The transaction size (25,000 shares) is small relative to the issuer's outstanding shares (423.65 million), suggesting limited direct dilution or immediate market impact. However, three recent sales of equal size in a three-month span total 75,000 shares, which is relevant for monitoring insider selling patterns.

Compliance/Risk Analyst

TL;DR The Form 144 appears complete for Rule 144 disclosure; acquisitions and prior sales are documented.

The notice includes required acquisition details (dates, restricted stock origin, amounts) and prior sales in the past three months, supporting regulatory transparency. The seller certifies no undisclosed material adverse information. The filing does not indicate any trading plan adoption date or other 10b5-1 specifics, so compliance context is limited to the statements provided.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	25000	2258225.00	423650362	08/28/2025	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	02/28/2021	Restricted Stock	Issuer			6890	02/28/2021	Not Applicable
Common	08/01/2025	Restricted Stock	Issuer			1748	08/01/2025	Not Applicable
Common	02/15/2022	Restricted Stock	Issuer			11911	02/15/2022	Not Applicable
Common	02/17/2022	Restricted Stock	Issuer			4451	02/17/2022	Not Applicable

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
FREDERICK SAINT 1201 Wilson Blvd Arlington VA 22209	Common	07/28/2025	25000	2330827.51
FREDERICK SAINT 1201 Wilson Blvd Arlington VA 22209	Common	06/11/2025	25000	2027382.51

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What is being reported in this Form 144 for CoStar Group (CSGP)?

The form reports a proposed sale of 25,000 shares of CoStar common stock through Morgan Stanley Smith Barney with an approximate sale date of 08/28/2025 and aggregate market value of $2,258,225.00.

Who is the seller named in the filing?

The seller is identified as Frederick Saint, with an address listed in Arlington, VA.

Has this seller made recent sales of CSGP stock?

Yes. The filing discloses prior sales of 25,000 shares on 07/28/2025 (gross proceeds $2,330,827.51) and 25,000 shares on 06/11/2025 (gross proceeds $2,027,382.51).

How were the shares being sold originally acquired?

The shares were acquired as restricted stock from the issuer on multiple dates: 02/28/2021 (6,890 shares), 02/15/2022 (11,911), 02/17/2022 (4,451), and 08/01/2025 (1,748).

Which broker is handling the proposed sale?

The broker listed is Morgan Stanley Smith Barney LLC Executive Financial Services located at 1 New York Plaza, 8th Floor, New York, NY 10004.