For all of those businesses large and small who might be worried their rankings will simply tank just from changing their hosting company can now sleep at night. Coming from Matt Cutt’s mouth he claims that changing your hosting company will not affect your SEO in any sort of way. This is assuming that you are moving to a quality hosting company and not to a server that is jammed up with other spammy websites. Changing a hosting provider can be a very scary moment for many businesses especially when your entire livelihood depends on your website. Any problems could put your sales for that day or week in a very tricky and dangerous situation.
Here is the video from Matt Cutts about Changing Your Hosting:
Always try moving your website to a quality hosting company. It might not directly reflect your rankings but you never want your company website to share a server with a handful of websites that might have slightly frowned upon services. If one of those website carries a virus onto the server the server could ultimately go down for some period of time.