# CoStar

[2 tracked vendors](https://thirdpartyindex.com/vendors/costar#used-by) name CoStar as a subprocessor, including [Cushman & Wakefield](https://thirdpartyindex.com/vendors/cushman-and-wakefield) and [Flywire](https://thirdpartyindex.com/vendors/flywire). We have not found a subprocessor list published by CoStar. We monitor 3 of its documents, which we last checked on 2026-11-12.

CoStar (costar.com): subprocessors, data processing agreement, security documents and changes, as monitored by Third Party Index.

- Page: https://thirdpartyindex.com/vendors/costar
- Documents last verified: 2026-11-12
- Transparency rating: 26/100 (how much it publishes, not how secure it is): Subprocessor list 0/30 (not found); Processing locations 0/8 (no list); Purposes 0/7 (no list); Data processing addendum 12/12; Trust center 0/8 (not found); Privacy policy 6/6; security.txt 0/6 (not found); Security page 0/5 (not found); Status page 0/5 (not found); Vulnerability disclosure 0/5 (not found); Pages still reachable 8/8
- Supply chain: relies on 0 tracked vendors directly, 0 within two hops, 0 within three; 2 tracked vendors rely on it directly, 3 within two hops, 16 within three
- Cite as: CoStar, Third Party Index, https://thirdpartyindex.com/vendors/costar (data CC BY 4.0)

## Documents

| Document | URL | Last verified | Last changed |
|---|---|---|---|
| Data processing addendum | https://www.costar.com/sites/costar.com.na/files/2026-01/Costar%20DPA%20SCCs%20%28Modular%201%20%26%202%2C%203%20Schedules%201-4%29.pdf | 2026-11-11 | 2026-11-07 |
| Privacy policy | https://www.costar.com/about/privacy-notice | 2026-11-12 | 2026-11-06 |
| Terms | https://www.costar.com/about/termsofuse | 2026-11-12 | 2026-11-06 |

## Subprocessors (0)

No subprocessor list has been found or read for this vendor.

## Web Technologies

CoStar's homepage made 250 requests to 32 domains, 12 services controlled by another company, and 2 domains not identified. Loaded on 2026-11-08 by a browser that accepted nothing; other visits may load more or less. What a page loads is not a list of who receives customer data.

12 third parties by category: Advertising 5 (Google Cloud, StackAdapt; reviewed: Index Exchange Inc.; usually detected as Advertising: Magnite, Inc., PubMatic); Analytics 3 (Demandbase, LinkedIn, ZoomInfo); CDN 1 (UNPKG); Customer data platform 1 (reviewed: LiveRamp); RUM 1 (Akamai); Unclassified 1 (Chartbeat). Each company that appears controlled by another organization is counted once, under the main category of the technologies detected from it on this homepage or, when none was, the category recorded from the company's own page (marked reviewed) or else the one it is usually detected as on other published homepages (marked as such); unclassified: none of these.

### Third parties (12)

- Google Cloud: 85 requests to googlesyndication.com, doubleclick.net, 2mdn.net, google.com, adtrafficquality.google, googletagmanager.com, google-analytics.com; DoubleClick Ad Exchange (AdX), DoubleClick Campaign Manager (DCM), DoubleClick Floodlight, Google AdSense, Google Analytics, Google Publisher Tag, Google Tag Manager
- Akamai: 7 requests to go-mpulse.net, 72-94-239-8\_s-23-44-133-39\_ts-1794106175-clienttons-s.akamaihd.net, akstat.io, jbpo6caxy3li62xp4m7q-p2rqvb-e41b9ab94-clientnsv4-s.akamaihd.net, trial-eum-clientnsv4-s.akamaihd.net, trial-eum-clienttons-s.akamaihd.net; Akamai mPulse
- Demandbase: 4 requests to company-target.com, demandbase.com; Demandbase 11.10.0
- LinkedIn: 4 requests to linkedin.com, licdn.com; Linkedin Insight Tag
- StackAdapt: 4 requests to stackadapt.com; StackAdapt
- UNPKG: 4 requests to unpkg.com; Unpkg
- ZoomInfo: 3 requests to zi-scripts.com, zoominfo.com; Zoominfo
- Chartbeat: 2 requests to chartbeat.com, chartbeat.net
- Magnite, Inc.: 2 requests to rubiconproject.com, tremorhub.com
- Index Exchange Inc.: 1 request to casalemedia.com
- LiveRamp: 1 request to rlcdn.com
- PubMatic: 1 request to pubmatic.com

### Unknown (2)

Domains not identified yet: brightspotcdn.com, dshrp.com

### First party (1)

- CoStar: 119 requests to costar.com, loopnet.com; 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

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)

Tracked vendors whose own subprocessor lists name it, and what they say they use it for.

- [Cushman & Wakefield](https://thirdpartyindex.com/vendors/cushman-and-wakefield.md)
- [Flywire](https://thirdpartyindex.com/vendors/flywire.md): Market data and analytics

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Third Party Index (https://thirdpartyindex.com) monitors vendors' public security and privacy documents and keeps each version as evidence. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); vendors' own documents are theirs. API: https://thirdpartyindex.com/api