LYTIR

Company · CSGP

CoStar Group, Inc.

Name as listed on its exchange; filed with the SEC as COSTAR GROUP, INC.

Nasdaq's symbol directory lists CSGP on Nasdaq as “CoStar Group, Inc. - Common Stock”.

In the 12 months to Nov 8, 2026: insiders bought on 1 occasion ($2.5M); insiders sold on 2 occasions ($253K); 1 planned-sale notice; 1 filing by holders of 5% or more; 5 congressional trade disclosures; 5 company reports (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. FLORANCE ANDREW C, Founder and CEO bought on 1 day latest Aug 4, 2026 bought $2.5M
  2. Cann Cynthia Cammett, Chief Accounting Officer sold on 1 day latest Aug 7, 2026 sold $147K
  3. Hill John W sold on 1 day latest Aug 5, 2026 sold $106K
Every trade (3)
  1. SELLCann Cynthia Cammett, Chief Accounting Officer sold Aug 7, 2026 4,788 shares filing $147K
  2. SELLHill John W sold Aug 5, 2026 3,500 shares filing $106K
  3. BUYFLORANCE ANDREW C, Founder and CEO bought Aug 4, 2026 83,300 shares filing $2.5M

Planned sales · SEC Form 144

Notice given

A Form 144 is filed before an insider sells restricted stock. It states an intent; the sale, if it happens, appears later on a Form 4. Every recent notice

  1. Hill John W filed Aug 5, 2026 Director 3,500 shares planned sale date 08/05/2026 filing $106K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. BAMCO INC /NY/ filed Aug 14, 2026 Schedule 13G passive 21,626,763 shares filing 5.3%

Congress · STOCK Act

The Althing

Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.

  1. Gilbert Cisneros (D-CA31): Purchase Aug 19, 2026 reported Sep 10, 2026 one of 58 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  2. Gilbert Cisneros (D-CA31): Sale Apr 14, 2026 reported May 8, 2026 one of 94 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  3. Gilbert Cisneros (D-CA31): Purchase Mar 13, 2026 reported Apr 7, 2026 one of 141 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  4. Gilbert Cisneros (D-CA31): Purchase Jan 28, 2026 reported Feb 13, 2026 one of 151 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  5. Gilbert Cisneros (D-CA31): Purchase Dec 10, 2025 reported Jan 12, 2026 one of 121 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Entry into a material definitive agreement; Results of operations and financial condition; Regulation FD disclosure filing Oct 27, 2026
  2. Regulation FD disclosure filing Aug 21, 2026
  3. Results of operations and financial condition filing Jul 28, 2026
  4. Departure or appointment of directors or officers; Regulation FD disclosure filing Jul 13, 2026
  5. Departure or appointment of directors or officers; Submission of matters to a vote of security holders; Regulation FD disclosure filing Jun 25, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.