Horizon
Horizon declares 4 subprocessors in its subprocessor list, which we last checked on Oct 12, 2026 (evidence). They include Amazon Web Services, Google Cloud and OpenAI. No published changes since we first read it on Oct 11, 2026.
Not listed by any tracked vendor.
Subprocessors CSV of Horizon's subprocessors · Atom feed of Horizon's subprocessors DORA draft CSV of Horizon's subprocessors as declared by Horizon what's this? ·
4 third parties.
| Name | Purpose | Location | Listed since |
|---|---|---|---|
| Amazon Web Services | Cloud provider | ||
| Google Workspace | Identity provider | ||
| OpenAI AI | Engineering | ||
| Vanta | Continuous security and compliance monitoring | Security |
ComplianceCSV of Horizon's compliance · Atom feed of Horizon's compliance
- Certified
- Says it complies with
Certifications as Horizon's trust center lists them; reports are usually shared on request (evidence)
Incidents reported by Horizon's subprocessorsCSV of incidents reported by vendors Horizon lists · Atom feed of incidents reported by vendors Horizon lists
48 reported incidents in the last 30 days, by 2 of the vendors Horizon lists as subprocessors.
A subprocessor list names a company, not the service an incident touched. This does not show that Horizon was involved.
And 23 more. All of them: CSV · Who is around them.
ChangesCSV of Horizon's changes · Atom feed of Horizon's changes
See the list as we read it on any date: Time machine
None since tracking began.
Rating badge for Horizon's site
It updates with the rating.
<a href="https://thirdpartyindex.com/vendors/horizon"><img src="https://thirdpartyindex.com/badge/horizon.svg" alt="Horizon transparency rating on Third Party Index" height="20"></a>[](https://thirdpartyindex.com/vendors/horizon)