WordPress is used by very many many people. WordPress.org itself has millions of members, with a company structure which will pretty easily outscale the size of your own.
The website itself can be locked down pretty easily, and should have no way to interfere with the actual hosting itself - emails/dns settings or otherwise.
Provided you remain on the ball with updates, you should be smooth sailing should WordPress fulfill your requirements.
Best example I can quote is the UK Prime Ministerial site, which uses Wordpress. I imagine the spec for that site had some regard for security considerations...Do 50-person companies use Wordpress for their website? Or is it ideal for smaller, 3-5 person companies?
many do (though usually via an IT pro (and for far less than the numbers you quoted unless you get graphic designers involved)) ,Do 50-person companies use Wordpress for their website? Or is it ideal for smaller, 3-5 person companies?
but 50 Person web-designer companies don't normally do their own engineering projects,
and there is a reason for that
MVC is the current buzz in web application architectures. It comes from event-driven desktop application design and doesn't fit into web application design very well. But luckily nobody really knows what MVC means, so we can call our presentation layer separation mechanism MVC and move on. (Rasmus Lerdorf)
The Dream is not what you see in sleep; Dream is the thing which doesn't let you sleep. --(Dr. APJ. Abdul Kalam)