COMPANY PROFILE

ID5

Headquarters: London, United Kingdom · Founded: 2017

What it does and how it makes money

ID5 Technology Ltd, based in London, provides identity infrastructure for digital advertising: it assigns its own identifier (the ID5 ID) so publishers and advertisers can recognise the same user without relying on third-party cookies.

It sells identity services (the ID5 ID, an identity graph and a cross-device graph) to publishers, ad platforms and advertisers. ^[1]

What data it collects about you

According to its policy, it collects cookie IDs, ID5 IDs and mobile advertising IDs (IDFA/AAID), IP address, browser and device data, pages or apps visited with timestamps, and hashed email addresses uploaded by its clients. ^[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

https://id5.io/

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

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 →