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[Form 4] CoStar Group Inc Insider Trading Activity

Filing Impact
(High)
Filing Sentiment
(Negative)
Form Type
4
Rhea-AI Filing Summary

Saint Frederick G., identified as President, Marketplaces of CoStar Group, Inc. (CSGP), reported a sale of 25,000 shares of CoStar common stock on 08/28/2025 at an average price of $90.33 per share (sale prices ranged $90.30�$90.38). Following the transaction the reporting person beneficially owned 293,103 shares, held directly. The Form 4 was signed by attorney-in-fact Gene Boxer on 09/02/2025. The filing shows routine insider disposition with the required Section 16 disclosure and includes an explanatory remark on the average sale price.

Saint Frederick G., indicato come Presidente, Marketplaces di CoStar Group, Inc. (CSGP), ha venduto 25.000 azioni ordinarie di CoStar in data 28/08/2025 ad un prezzo medio di $90,33 per azione (prezzi di vendita compresi tra $90,30 e $90,38). Dopo l'operazione la persona segnalante deteneva beneficiariamente 293.103 azioni, possedute direttamente. Il Modulo 4 è stato firmato per procura dall’avvocato Gene Boxer il 02/09/2025. La comunicazione indica una disposizione ordinaria dell'insider conforme agli obblighi della Sezione 16 e riporta una nota esplicativa sul prezzo medio di vendita.

Saint Frederick G., identificado como Presidente de Marketplaces de CoStar Group, Inc. (CSGP), informó la venta de 25.000 acciones ordinarias de CoStar el 28/08/2025 a un precio medio de $90,33 por acción (precios de venta entre $90,30 y $90,38). Tras la operación, la persona informante poseía beneficiariamente 293.103 acciones en propiedad directa. El Formulario 4 fue firmado por apoderado, el abogado Gene Boxer, el 02/09/2025. La presentación refleja una disposición rutinaria del insider conforme a la Sección 16 e incluye una aclaración sobre el precio medio de venta.

Saint Frederick G.ëŠ� CoStar Group, Inc. (CSGP) Marketplacesì� 사장으로 기재ë˜ì–´ 있으ë©�, 2025-08-28ì—� CoStar 보통ì£� 25,000주를 주당 í‰ê·  $90.33ì—�(ë§¤ë„ ê°€ê²� 범위 $90.30â€�$90.38) 매ë„했다ê³� 보고했습니다. 거래 í›� ì‹ ê³ ì¸ì€ ì§ì ‘ 보유í•� 293,103주를 실질ì ìœ¼ë¡� 소유하고 있었습니ë‹�. Form 4ëŠ� ë²•ë¥ ëŒ€ë¦¬ì¸ Gene Boxerê°€ 2025-09-02ì—� 서명했습니다. 제출서는 섹션 16ì� 요건ì—� 따른 ì¼ìƒì � ë‚´ë¶€ìž� 처분ì� 나타내며 í‰ê·  매ë„ê°€ì—� 대í•� 설명ì� í¬í•¨ë˜ì–´ 있습니다.

Saint Frederick G., désigné Président, Marketplaces de CoStar Group, Inc. (CSGP), a déclaré la vente de 25 000 actions ordinaires CoStar le 28/08/2025 à un prix moyen de 90,33 $ par action (prix de vente entre 90,30 $ et 90,38 $). Après la transaction, la personne déclarant détenait bénéficiairement 293 103 actions, détenues directement. Le formulaire 4 a été signé par procuration par l’avocat Gene Boxer le 02/09/2025. le dépôt montre une cession interne de routine conforme à la Section 16 et comprend une remarque explicative sur le prix moyen de vente.

Saint Frederick G., angegeben als President, Marketplaces von CoStar Group, Inc. (CSGP), meldete am 28.08.2025 den Verkauf von 25.000 Stammaktien von CoStar zu einem durchschnittlichen Preis von $90,33 pro Aktie (Verkaufspreise zwischen $90,30 und $90,38). Nach der Transaktion hielt die meldende Person wirtschaftlich 293.103 Aktien direkt. Das Formular 4 wurde am 02.09.2025 vom Bevollmächtigten, Anwalt Gene Boxer, unterzeichnet. Die Meldung dokumentiert eine routinemäßige Insiderveräußerung gemäß Sektion 16 und enthält einen erklärenden Hinweis zum durchschnittlichen Verkaufspreis.

Positive
  • Timely and clear disclosure of an insider transaction on Form 4, including transaction date, price range, and post-sale ownership
  • Complete post-transaction ownership reported: 293,103 shares held directly
Negative
  • Insider sale of 25,000 shares, which decreases the officer's direct holdings
  • No information provided about the purpose of the sale (e.g., diversification, tax, or other), so intent is unspecified

Insights

TL;DR Insider officer sold a modest block of shares, reducing direct holdings to 293,103 shares; transaction was disclosed on Form 4.

The sale of 25,000 shares at an average price of $90.33 represents a routine insider disposition rather than a control change or a large, dilutive event. The filing clearly states the transaction date and post-sale ownership, and includes the required price-range explanation. For investors, this is a transparent disclosure but not, by itself, a material corporate event that alters capital structure or governance.

TL;DR Officer sale properly reported; no indications of related-party transfers or changes to officer status.

The Form 4 identifies the reporting person as a company officer and records a direct sale with an explicit price range and resulting share count. The signature by an attorney-in-fact and inclusion of explanatory remarks meet procedural requirements. There is no information in the filing indicating any compensatory, plan-based or derivative transaction, nor any amendment or correction to prior disclosures.

Saint Frederick G., indicato come Presidente, Marketplaces di CoStar Group, Inc. (CSGP), ha venduto 25.000 azioni ordinarie di CoStar in data 28/08/2025 ad un prezzo medio di $90,33 per azione (prezzi di vendita compresi tra $90,30 e $90,38). Dopo l'operazione la persona segnalante deteneva beneficiariamente 293.103 azioni, possedute direttamente. Il Modulo 4 è stato firmato per procura dall’avvocato Gene Boxer il 02/09/2025. La comunicazione indica una disposizione ordinaria dell'insider conforme agli obblighi della Sezione 16 e riporta una nota esplicativa sul prezzo medio di vendita.

Saint Frederick G., identificado como Presidente de Marketplaces de CoStar Group, Inc. (CSGP), informó la venta de 25.000 acciones ordinarias de CoStar el 28/08/2025 a un precio medio de $90,33 por acción (precios de venta entre $90,30 y $90,38). Tras la operación, la persona informante poseía beneficiariamente 293.103 acciones en propiedad directa. El Formulario 4 fue firmado por apoderado, el abogado Gene Boxer, el 02/09/2025. La presentación refleja una disposición rutinaria del insider conforme a la Sección 16 e incluye una aclaración sobre el precio medio de venta.

Saint Frederick G.ëŠ� CoStar Group, Inc. (CSGP) Marketplacesì� 사장으로 기재ë˜ì–´ 있으ë©�, 2025-08-28ì—� CoStar 보통ì£� 25,000주를 주당 í‰ê·  $90.33ì—�(ë§¤ë„ ê°€ê²� 범위 $90.30â€�$90.38) 매ë„했다ê³� 보고했습니다. 거래 í›� ì‹ ê³ ì¸ì€ ì§ì ‘ 보유í•� 293,103주를 실질ì ìœ¼ë¡� 소유하고 있었습니ë‹�. Form 4ëŠ� ë²•ë¥ ëŒ€ë¦¬ì¸ Gene Boxerê°€ 2025-09-02ì—� 서명했습니다. 제출서는 섹션 16ì� 요건ì—� 따른 ì¼ìƒì � ë‚´ë¶€ìž� 처분ì� 나타내며 í‰ê·  매ë„ê°€ì—� 대í•� 설명ì� í¬í•¨ë˜ì–´ 있습니다.

Saint Frederick G., désigné Président, Marketplaces de CoStar Group, Inc. (CSGP), a déclaré la vente de 25 000 actions ordinaires CoStar le 28/08/2025 à un prix moyen de 90,33 $ par action (prix de vente entre 90,30 $ et 90,38 $). Après la transaction, la personne déclarant détenait bénéficiairement 293 103 actions, détenues directement. Le formulaire 4 a été signé par procuration par l’avocat Gene Boxer le 02/09/2025. le dépôt montre une cession interne de routine conforme à la Section 16 et comprend une remarque explicative sur le prix moyen de vente.

Saint Frederick G., angegeben als President, Marketplaces von CoStar Group, Inc. (CSGP), meldete am 28.08.2025 den Verkauf von 25.000 Stammaktien von CoStar zu einem durchschnittlichen Preis von $90,33 pro Aktie (Verkaufspreise zwischen $90,30 und $90,38). Nach der Transaktion hielt die meldende Person wirtschaftlich 293.103 Aktien direkt. Das Formular 4 wurde am 02.09.2025 vom Bevollmächtigten, Anwalt Gene Boxer, unterzeichnet. Die Meldung dokumentiert eine routinemäßige Insiderveräußerung gemäß Sektion 16 und enthält einen erklärenden Hinweis zum durchschnittlichen Verkaufspreis.

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)
08/28/2025
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 08/28/2025 S 25,000 D $90.33(1) 293,103 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 $90.30 to $90.38.
Remarks:
/s/ Gene Boxer, Attorney-in-Fact 09/02/2025
** 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 did the CoStar Group (CSGP) insider sell?

The reporting person sold 25,000 shares of CoStar common stock on 08/28/2025 at an average price of $90.33 per share.

Who filed the Form 4 for CSGP and what is their role?

The Form 4 was filed for Saint Frederick G., identified as President, Marketplaces of CoStar Group, Inc.

How many CoStar shares does the reporting person own after the sale?

Following the reported transaction the reporting person beneficially owned 293,103 shares, held directly.

When was the Form 4 signed and by whom?

The form bears a signature by attorney-in-fact Gene Boxer dated 09/02/2025.

What sale price range was disclosed on the Form 4?

The average sale price reported was $90.33, with sale prices ranging from $90.30 to $90.38.
Costar Group Inc

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AGÕæÈ˹ٷ½ Estate Services
Services-business Services, Nec
United States
WASHINGTON