WP Engine is an enterprise-grade WordPress hosting platform founded in Austin, Texas in 2010, serving brands and agencies with Everest caching, a global CDN, StudioPress themes, and 24/7 expert support.
Pantheon is a US professional WebOps hosting platform founded in 2010 in San Francisco, specialized in WordPress and Drupal, offering a Git-driven Multidev workflow, Autopilot automation, and a global edge CDN; it was acquired by Vista Equity in 2021.
WordPress.com is a managed WordPress platform launched by Automattic in 2005, with built-in Jetpack backup, security, and a global CDN and unlimited bandwidth on paid plans, letting users run sites without operating servers.