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CoStar Group, Inc.

CSGP · NASDAQ

Market cap (USD)$11.8B
SectorReal Estate
IndustryReal Estate - Services
CountryUS
Data as of
Moat score
71/ 100

Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.

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Overview

CoStar Group operates real estate information, analytics, 3D spatial-data and marketplace businesses across commercial and residential property. Current reporting divides the company into Commercial Real Estate and Residential Real Estate, with Q1 2026 revenue led by Residential Real Estate (47%), CoStar (37%), LoopNet (9%) and Other Commercial Real Estate (6%). The strongest moat is the CoStar CRE data platform: decades of proprietary data collection, research scale, workflow embedding and participant data contributions. LoopNet and Residential Real Estate rely more on two-sided marketplace effects and brand/traffic scale. Key risks are portal competition, customer multi-homing, litigation/regulatory pressure, housing-cycle sensitivity and heavy residential marketing investment.

Primary segment

Residential Real Estate (Apartments.com, Homes.com, Land.com, Domain, OnTheMarket)

Market structure

Oligopoly

Market share

HHI:

Coverage

4 segments · 8 tags

Updated 2026-07-01

Segments

CoStar (commercial real estate information & analytics)

Commercial real estate information, analytics, benchmarking, lease management and workflow software

Revenue

36.9%

Structure

Oligopoly

Pricing

strong

Share

Peers

MSCIMCOSPGIICE+1

LoopNet (commercial property marketing marketplace)

Online commercial property listing marketplaces for sale and lease advertising

Revenue

9.5%

Structure

Oligopoly

Pricing

moderate

Share

Peers

CREXIZCOMPRDFN

Other Commercial Real Estate (Matterport, BizBuySell, Ten-X)

Commercial real estate 3D digital twins, business-for-sale marketplaces and CRE auction platforms

Revenue

6.2%

Structure

Competitive

Pricing

weak

Share

Peers

EBAYCREXIMATTERPORT ALTERNATIVES

Residential Real Estate (Apartments.com, Homes.com, Land.com, Domain, OnTheMarket)

Residential rental, for-sale and land property portals with subscription and listing advertising

Revenue

47.4%

Structure

Oligopoly

Pricing

moderate

Share

Peers

ZNWSAREA.AXRMV.L+2

Moat Claims

CoStar (commercial real estate information & analytics)

Commercial real estate information, analytics, benchmarking, lease management and workflow software

Revenue share computed from Q1 2026 Form 10-Q: CoStar revenue of $331M divided by total revenue of $897M.

Oligopoly

Capex Knowhow Scale

Supply

Strength

Strength 5 of 5

Durability

Durability 3 of 3

Confidence

Confidence 4 of 5

Evidence

Evidence 2 of 5

Decades of proprietary CRE data collection, acquisitions, field research and quality-control processes make the core database expensive and slow to replicate.

Capex Knowhow Scale moat: definition, examples, and stocks

Erosion risks

  • AI-assisted public-record extraction and alternative data reduce collection cost
  • Broker/customer multi-homing across competing data platforms
  • CRE downturn reduces willingness to pay for premium data seats

Leading indicators

  • CoStar revenue growth and subscriber growth
  • Net new subscription bookings
  • Renewal rate and seat expansion

Counterarguments

  • Many raw CRE facts are public or obtainable from third parties
  • Large brokerages and investors can build internal data layers across multiple feeds

Data Network Effects

Network

Strength

Strength 4 of 5

Durability

Durability 3 of 3

Confidence

Confidence 4 of 5

Evidence

Evidence 1 of 5

Prominent industry usage can attract broker and owner submissions, improving data timeliness and reinforcing the platform.

Data Network Effects moat: definition, examples, and stocks

Erosion risks

  • Brokers redirect listings and transaction submissions to rival platforms
  • Data quality disputes reduce willingness to contribute
  • Policy or antitrust changes limit platform access terms

Leading indicators

  • Listing and transaction update volume
  • Customer-reported data quality
  • Competitive contribution/share trends

Counterarguments

  • Contributors can multi-home and provide the same data to competitors
  • Network benefits are weaker if users treat data platforms as utilities rather than communities

Data Workflow Lockin

Demand

Strength

Strength 4 of 5

Durability

Durability 3 of 3

Confidence

Confidence 4 of 5

Evidence

Evidence 2 of 5

CoStar data, analytics, benchmarking, lease software and customer workflows can become embedded in prospecting, valuation, underwriting and portfolio management.

Data Workflow Lockin moat: definition, examples, and stocks

Erosion risks

  • Customers externalize data into internal platforms
  • Regulators constrain contracting practices or data access terms
  • Lower-cost competitors win marginal users on price

Leading indicators

  • Subscription revenue mix
  • Renewal rate and churn
  • Customer seat expansion/contraction

Counterarguments

  • Contracts eventually renew and users can parallel-run competing tools
  • Modern APIs and data warehouses reduce technical switching costs

IP Choke Point

Legal

Strength

Strength 3 of 5

Durability

Durability 2 of 3

Confidence

Confidence 3 of 5

Evidence

Evidence 1 of 5

Copyright, trade-secret protections and active enforcement can deter copying of proprietary databases, photography, software and analytics, though raw facts are harder to protect.

IP Choke Point moat: definition, examples, and stocks

Erosion risks

  • Raw factual data may not be copyrightable
  • Litigation cost, adverse rulings or antitrust scrutiny
  • Competitors source substitute content from customers or public records

Leading indicators

  • IP litigation outcomes
  • Unauthorized copying incidents
  • Changes in copyright/database protection law

Counterarguments

  • Legal protection can deter copying but does not by itself create customer demand
  • Aggressive enforcement may create reputation or regulatory backlash

LoopNet (commercial property marketing marketplace)

Online commercial property listing marketplaces for sale and lease advertising

Revenue share computed from Q1 2026 Form 10-Q: LoopNet revenue of $85M divided by total revenue of $897M.

Oligopoly

Two Sided Network

Network

Strength

Strength 5 of 5

Durability

Durability 3 of 3

Confidence

Confidence 4 of 5

Evidence

Evidence 2 of 5

LoopNet benefits from a large audience of CRE searchers and advertiser supply; more listings improve user utility, while more traffic improves advertiser ROI.

Two Sided Network moat: definition, examples, and stocks

Erosion risks

  • Advertisers multi-home across CRE listing sites
  • Search algorithm changes or paid-search inflation reduce traffic economics
  • Commercial transaction downturn reduces advertiser budgets

Leading indicators

  • Paid listing count
  • Average price per listing
  • Marketplace traffic and lead conversion

Counterarguments

  • Brokers can distribute listings through owned channels, email lists and social media
  • A rival can buy traffic or subsidize listings to seed supply

Ecosystem Complements

Network

Strength

Strength 4 of 5

Durability

Durability 3 of 3

Confidence

Confidence 4 of 5

Evidence

Evidence 1 of 5

LoopNet can reuse CoStar's database, photography and research content to improve listing quality and search experience.

Ecosystem Complements moat: definition, examples, and stocks

Erosion risks

  • Competitors source comparable listing content directly from brokers
  • Data licensing or content rights disputes constrain reuse

Leading indicators

  • Organic traffic share for CRE listing terms
  • Lead submissions per listing
  • Content production cost per listing

Counterarguments

  • Marketplace UX and distribution can matter more than data depth for some advertisers

Other Commercial Real Estate (Matterport, BizBuySell, Ten-X)

Commercial real estate 3D digital twins, business-for-sale marketplaces and CRE auction platforms

Revenue share computed from Q1 2026 Form 10-Q: Other Commercial Real Estate revenue of $56M divided by total revenue of $897M.

Competitive

Ecosystem Complements

Network

Strength

Strength 3 of 5

Durability

Durability 2 of 3

Confidence

Confidence 3 of 5

Evidence

Evidence 2 of 5

Matterport spatial data, Ten-X auctions and BizBuySell listings can benefit from CoStar data, traffic, sales reach and cross-promotion, but each subcategory remains competitive.

Ecosystem Complements moat: definition, examples, and stocks

Erosion risks

  • Spatial-data competitors and lower-cost 3D capture tools commoditize Matterport
  • Auction/listing sellers multi-home across specialist sites
  • Transaction volume declines in CRE downturns

Leading indicators

  • Matterport hosted spaces/subscription revenue
  • Ten-X auction property volume and take rate
  • BizBuySell listing volume and traffic

Counterarguments

  • These are heterogeneous businesses with weaker shared network effects than CoStar or Apartments.com
  • Specialist competitors can win by vertical focus or lower pricing

Two Sided Network

Network

Strength

Strength 3 of 5

Durability

Durability 2 of 3

Confidence

Confidence 3 of 5

Evidence

Evidence 1 of 5

Ten-X and BizBuySell rely on buyer/seller liquidity; network effects exist but are category-specific and cyclical.

Two Sided Network moat: definition, examples, and stocks

Erosion risks

  • Sellers list through brokers or competing auction/listing platforms
  • Lower transaction volume weakens buyer attention
  • Paid search and SEO competition raises acquisition cost

Leading indicators

  • Auction volume
  • Bidder participation
  • Paid listing volume

Counterarguments

  • Marketplace liquidity is fragmented and can be replicated within specific niches
  • Matterport revenue is more spatial-data/SaaS than classic two-sided marketplace revenue

Residential Real Estate (Apartments.com, Homes.com, Land.com, Domain, OnTheMarket)

Residential rental, for-sale and land property portals with subscription and listing advertising

Revenue share computed from Q1 2026 Form 10-Q: Residential Real Estate revenue of $425M divided by total revenue of $897M. This current disclosure includes Apartments.com, Homes.com, Land.com, Domain and OnTheMarket rather than separating multifamily and homes revenue.

Oligopoly

Two Sided Network

Network

Strength

Strength 4 of 5

Durability

Durability 2 of 3

Confidence

Confidence 4 of 5

Evidence

Evidence 3 of 5

Apartments.com has stronger established network effects; Homes.com, Domain and OnTheMarket add residential portal scale but still face entrenched incumbents and high marketing intensity.

Two Sided Network moat: definition, examples, and stocks

Erosion risks

  • Zillow, Realtor.com, REA and Rightmove maintain stronger default consumer behavior in key markets
  • High marketing spend required to sustain traffic
  • Agents and property managers multi-home across portals

Leading indicators

  • Average monthly unique visitors
  • Homes.com member count and churn
  • Apartments.com advertiser count and lead quality

Counterarguments

  • Residential portals often become winner-take-most by market, making #2 scale less valuable
  • Traffic can be expensive to buy and may not translate into durable lead quality

Brand Trust

Demand

Strength

Strength 4 of 5

Durability

Durability 2 of 3

Confidence

Confidence 3 of 5

Evidence

Evidence 1 of 5

Apartments.com and Homes.com are visible consumer brands; brand trust helps attract searchers and advertisers, but portal brands can shift when ROI or traffic quality changes.

Brand Trust moat: definition, examples, and stocks

Erosion risks

  • Lead quality disappoints advertisers
  • Competitors outspend or out-rank in search
  • Consumer confusion across portal brands

Leading indicators

  • Organic traffic share
  • Direct traffic and app usage
  • Advertiser ROI and renewal rates

Counterarguments

  • Residential search brands remain highly contestable through SEO, paid marketing and app distribution

Suite Bundling

Demand

Strength

Strength 3 of 5

Durability

Durability 2 of 3

Confidence

Confidence 3 of 5

Evidence

Evidence 2 of 5

Residential portals combine listings, neighborhood content, applications, screening, payments and agent/member advertising, increasing advertiser utility beyond basic impressions.

Suite Bundling moat: definition, examples, and stocks

Erosion risks

  • Property management software vendors own the workflow layer
  • Agents and managers use third-party screening/payments/CRM tools
  • Regulatory limits on rental applications or data use

Leading indicators

  • Attach rate for applications/screening/payments
  • Lead-to-lease conversion
  • Agent/member renewal and upgrade rates

Counterarguments

  • Advertisers can keep workflow systems separate and use portals only for lead generation

Evidence

sec_filing

We have spent more than 35 years building and acquiring databases of real estate information

Direct evidence of cumulative investment and time required to assemble the core data asset.

sec_filing

the largest research department in the commercial real estate industry

Supports a scale/know-how advantage in data collection and validation.

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many of these professionals routinely take the initiative and proactively report available space and transactions

Participant contributions can reinforce data breadth and freshness.

sec_filing

an integrated solution of online service offerings

Shows the core data product is delivered as an integrated workflow suite, not only as static data.

sec_filing

Revenue from our subscription-based contracts was approximately 90%

Current recurring revenue mix supports contractual and workflow persistence.

Showing 5 of 18 sources.

Risks & Indicators

Erosion risks

  • AI-assisted public-record extraction and alternative data reduce collection cost
  • Broker/customer multi-homing across competing data platforms
  • CRE downturn reduces willingness to pay for premium data seats
  • Brokers redirect listings and transaction submissions to rival platforms
  • Data quality disputes reduce willingness to contribute
  • Policy or antitrust changes limit platform access terms

Leading indicators

  • CoStar revenue growth and subscriber growth
  • Net new subscription bookings
  • Renewal rate and seat expansion
  • Data coverage/freshness versus CRE data peers
  • Listing and transaction update volume
  • Customer-reported data quality

Keep the research going

Created 2025-12-29
Updated 2026-07-01

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