CoStar

costar.com

2 tracked vendors name CoStar as a subprocessor, including Cushman & Wakefield and Flywire. We have not found a subprocessor list published by CoStar. We monitor 3 of its documents, which we last checked on Nov 12, 2026.

Subprocessors

None extracted.

Web TechnologiesCSV · Atom

CoStar's homepage made 250 requests to 32 domains, 12 services controlled by another company, and 2 domains not identified.

Advertising (5): Google Cloud, StackAdapt; reviewed: Index Exchange Inc.; usually detected as Advertising: Magnite, Inc., PubMaticAnalytics (3): Demandbase, LinkedIn, ZoomInfoCDN (1): UNPKGOther (2): reviewed as Customer data platform: LiveRamp; RUM: AkamaiUnclassified (1): no technology detected from them: Chartbeat

12 third parties by category: Advertising 5Analytics 3CDN 1Other 2Unclassified 1

Third parties 12 · 118 requests
Google Cloud DoubleClick Ad Exchange (AdX) DoubleClick Campaign Manager (DCM) DoubleClick Floodlight Google AdSense Google Analytics Google Publisher Tag Google Tag Manager 34% of the page's requests 85
Akamai Akamai mPulse 3% of the page's requests 7
Demandbase Demandbase 11.10.0 2% of the page's requests 4
LinkedIn Linkedin Insight Tag 2% of the page's requests 4
StackAdapt StackAdapt 2% of the page's requests 4
UNPKG Unpkg 2% of the page's requests 4
ZoomInfo Zoominfo 1% of the page's requests 3
Chartbeat chartbeat.com, chartbeat.net <1% of the page's requests 2
Magnite, Inc. rubiconproject.com, tremorhub.com <1% of the page's requests 2
Index Exchange Inc. casalemedia.com <1% of the page's requests 1
LiveRamp rlcdn.com <1% of the page's requests 1
PubMatic pubmatic.com <1% of the page's requests 1
Unknown 2 · 13 requests

brightspotcdn.comdshrp.com

First party 1 · 119 requests
CoStar Akamai Akamai Bot Manager Apollo 3.9.11 Boomerang Chartbeat Emotion Envoy GraphQL Next.js 16.3.8 Next.js App Router Open Graph Priority Hints React 18.3.1 React Router 6 Turbopack Webpack reCAPTCHA TypeScript 48% of the page's requests 119

9 tracked companies loaded by the homepage are not in CoStar's subprocessor list. A website can use a service without it processing customer data.

Subprocessor of (2)CSV · Atom

2 companies

ChangesCSV · Atom

None since tracking began.

Rating badge for CoStar's site

CoStar transparency rating

It updates with the rating.

<a href="https://thirdpartyindex.com/vendors/costar"><img src="https://thirdpartyindex.com/badge/costar.svg" alt="CoStar transparency rating on Third Party Index" height="20"></a>
[![CoStar transparency rating on Third Party Index](https://thirdpartyindex.com/badge/costar.svg)](https://thirdpartyindex.com/vendors/costar)