How many insider trades does FilingIQ track for CSGP?

FilingIQ tracks 573 Form 4 insider transactions for CSGP (COSTAR GROUP, INC.), covering filings from Feb 21, 2015 onwards. 45 of those were filed in the last 90 days.

Are CSGP insiders net buyers or net sellers?

Across the full Form 4 history for CSGP, 7 transactions (1%) were open-market purchases and 89 (16%) were open-market sales. Compensatory awards and option exercises are filtered out of these counts.

Where does CSGP insider data come from?

Every transaction shown on this page is sourced directly from SEC EDGAR Form 4 filings. FilingIQ parses the raw XML, normalises insider identity across reporting variations, and scores each trade on its multi-factor composite model.

What sector is CSGP in?

COSTAR GROUP, INC. (CSGP) is classified in the Real Estate sector, specifically Real Estate Services, with a current market capitalisation of $20.29B.

CSGP insider trading

NasdaqGS Real Estate

COSTAR GROUP, INC. — scored insider trade history from SEC Form 4 filings, parsed and contextualised by FilingIQ.

Total Form 4 trades

573

Last 90 days

Buys / sells

1% / 16%

Market cap

$20.29B

About COSTAR GROUP, INC.

CoStar Group, Inc. provides information, analytics, and online marketplace services in the United States, Canada, Europe, the Asia Pacific, and Latin America. It offers CoStar Property that provides inventory of office, industrial, retail, multifamily, hospitality, and student housing properties and land; CoStar Leasing, a data on lease transactions and tools to manage user-entered lease data; CoStar Sales, a database of commercial real estate sales transactions; CoStar Owners provides detailed portfolio information; CoStar Markets to view and report on market and submarket trends; and CoStar Tenant that provides tenant information. The company also provides CoStar Benchmarking allows hotels to measure performance against competitors; CoStar Lender, a tool for lenders to manage loan portfolios and risk; and real estate and lease management technology solutions, such as lease administration, lease accounting, and abstraction services. In addition, it offers Apartamentos.com, an apartment marketing sites; LoopNet.com, a commercial property marketing sites; Homes.com, a homes for sale listings site; Ten-X, an online auction platform for commercial real estate; Land.com, a marketplace for rural land sales; and BizBuySell.com, a marketplace for operating businesses and franchises for sale. It serves sales, leasing, and mortgage brokers; property, real estate investment trust, insurance companies, and asset managers; and government agencies, property owners, mortgage-backed security issuers, appraisers, design and construction professionals, pension fund managers, real estate developers, reporters tenant vendors, bankers, building services vendors, mortgage bankers, communications providers, retailers, institutional advisors, hospitality owners, investors, and real estate agents. The company was founded in 1987 and is headquartered in Arlington, Virginia.

Company website: www.costargroup.com

CSGP insider activity at a glance

FilingIQ has scored 573 insider transactions for CSGP since Feb 21, 2015. The most recent filing in our index is dated May 1, 2026.

Across the full history, 7 open-market purchases and 89 open-market sales were filed under transaction codes P and S respectively. Compensatory share awards (code A) and option exercises (code M) are tracked separately and not counted here.

The average FilingIQ composite score on CSGP insider trades is 61.6/100, produced by FilingIQ's multi-factor Form 4 model. Model framework documented at methodology.

View live CSGP trades on FilingIQ Raw filings on SEC EDGAR

Latest CSGP Form 4 filings

FLORANCE ANDREW C President and CEO

P May 1, 2026

SAINT FREDERICK G. President, Marketplaces

P Mar 2, 2026

FLORANCE ANDREW C President and CEO

P Feb 27, 2026

SIMURO FRANK Chief Technology Officer

S Jun 27, 2023

Most recent disclosures. Sign up to filter by score, transaction code, or insider role.

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IRM 111

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RHP 104

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SAUL CENTERS, INC.

MMI 90

Marcus & Millichap, Inc.

JLL 88

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Top insiders trading CSGP

SAINT FREDERICK G.

6 trades · score 79.0

13F funds holding CSGP

AKRE CAPITAL MANAGEMENT LLC

$701.47M · 5.8% of AUM

Findlay Park Partners LLP

$196.09M · 2.1% of AUM

JANUS HENDERSON GROUP PLC (JHG)

$978336 · 0.7% of AUM

MACQUARIE GROUP LTD

$508490 · 0.6% of AUM

Politicians who have traded CSGP

Cisneros, Gilbert

U.S. Rep. , CA · 2,466 trades

Frequently asked

How many insider trades does FilingIQ track for CSGP?: FilingIQ tracks 573 Form 4 insider transactions for CSGP (COSTAR GROUP, INC.), covering filings from Feb 21, 2015 onwards. 45 of those were filed in the last 90 days.
Are CSGP insiders net buyers or net sellers?: Across the full Form 4 history for CSGP, 7 transactions (1%) were open-market purchases and 89 (16%) were open-market sales. Compensatory awards and option exercises are filtered out of these counts.
Where does CSGP insider data come from?: Every transaction shown on this page is sourced directly from SEC EDGAR Form 4 filings. FilingIQ parses the raw XML, normalises insider identity across reporting variations, and scores each trade on its multi-factor composite model.
What sector is CSGP in?: COSTAR GROUP, INC. (CSGP) is classified in the Real Estate sector, specifically Real Estate Services, with a current market capitalisation of $20.29B.

Methodology & sources

Every CSGP insider transaction shown on FilingIQ is parsed directly from a public SEC Form 4 XML filing. Insider identity is normalised across reporting variants (CIK changes, name spellings, related-party indirect holdings). The FilingIQ composite score is documented in full on the team page and algo disclosure. Not investment advice; see disclaimer.