Security
Who left PerimeterX, and who still runs it
488 websites in the top 1M run PerimeterX, observed directly from the rendered page in the July 2026 crawl.
Some companies running PerimeterX
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
Cloudflare 75%HSTS 66%core-js 65%Google Analytics 60%Open Graph 59%Cloudflare Bot Management 57%Google Tag Manager 55%jQuery 45%Amazon Web Services 42%Priority Hints 42%
Share of a 488-domain sample of PerimeterX users that also run each.