COMPANY PROFILE
Quantcast
Headquarters: San Francisco, United States · Founded: 2006
What it does and how it makes money
A US technology company focused on advertising, audience insights and measurement; it offers businesses tools to buy targeted ads (Quantcast Advertise) and measure website audiences (Quantcast Measure).
Its revenue comes from the targeted-advertising and audience-measurement services it sells to businesses. [1]
What data it collects about you
Through tags, pixels and SDKs it collects pseudonymous identifiers (cookies, device IDs, IP addresses, hashed emails), approximate location (such as zip code), browsing behaviour and ad-auction data, plus audience segments from clients and third parties and inferences; it says it does not intentionally collect names, phone numbers or precise location. [2]
Fines and sanctions
We found no published fines or sanctions when we checked it on October 12, 2026.
Data breaches and hacks
We found no published data breaches when we checked it on October 12, 2026.
Ask it to delete your data
This is the page the company itself gives to ask it to delete your data or stop selling it: Open its page [3]
With GUARDIANA or GUARDIANA ZERO, you download from this same profile the letter asking it to delete your data, under your country’s law, ready to attach to an email.
Its website
Does this company follow you? GUARDIANA ZERO, GUARDIANA’s browser, cuts its connections and shows you how many times it tried. Meet GUARDIANA ZERO →
Sources
- https://en.wikipedia.org/wiki/Quantcast
- https://help.quantcast.com/docs/faq-data-collection-and-use
- https://www.quantcast.com/privacy-choices/
What this profile does NOT say
- It does not say this company does anything illegal. The only thing it states about anyone’s legality is what a regulator or a court has already decided, with the date and the link to the source.
- It does not say what data of yours it holds: only the company knows, which is why you have the right to ask it.
- If you are this company and a fact is wrong, write to hola@guardianagroup.com and it will be corrected, with its date.
Public facts with their sources, checked on October 12, 2026. All profiles →