Does using the same webhost for many domains hurt your SEO?

No.

But the myth continues for those who sell hosting.

The only thing you would have to worry about, is
diversifying hosts only because things may happen.
(not in your case as you won't be doing that)

But, in response to these concerns, I have never
heard of any reputable host having anything bad
happen to it or the sites they host. So, go
with a reputable host and you have no problems.

Big sites do it all the time. From wikipedia to
gasbuddy and everything in between.

Big myth that just keeps going and going and
going. All my sites are on the same host, same
server. I am on a first name basis with the owner
and operator. That's golden. I see no reason to
change. Never had any problems, never foresee
any either. All linked up in a linking empire.

The internet runs on shared hosting. People just
don't realize this, or fail to acknowledge it.

If you really want the killer of these myths, the
one to kill 'em all is subdomains. They are treated
as a complete separate domain. Now, how many
sites use subdomains? True, you could put them
on a separate server, but do you realize how many
servers some sites would need?

Paul

One other point -- if you load too many different sites into one shared hosting plan, it can have a negative impact on the responsiveness of the websites. Having a slow website IS a part of what Google looks at when evaluating a site. You can check your site speed with WebPagetest - Website Performance and Optimization Test.

It doesn't need to be a different hosting company, necessarily, but I'd recommend getting a new plan for each three or so small websites.

You can also move to the next step up - a dedicated host - where you can monitor the speed yourself using something like WebPagetest - Website Performance and Optimization Test and only add capacity as really needed. Unfortunately, a dedicated host is a good deal more expensive than a shared hosting account.

Agree with what Paul says.

If you look at your typical Bluehost account, you'll be shared the same IP address with a few hundred other sites.

The only potential SEO reason for splitting your hosting, is if you are going to be linking your sites.

You shouldn't interlink. That is. The rest is bullwhip to make you buy more hosting accounts :]

you need to prevent using the same c block when linking between two websites, you can check if your hosting supplier offers adding ip (again, with different cBlock).

Just like anything else in business, It makes sense to diversify. I had 17 of my websites on one of my hosting accounts hacked at the same time. That made a lot of money websites be down at the same time. Other separate hosting accounts were not affected at all. To my way of thinking, that is a good reason to have several hosting accounts with my domains spread out across them. You can have several accounts with the same host, if you like them.
Best wishes,
Carole

Paulgl is completely right AGAIN!

Think about it people. How can hosting all your sites on the same hosting provider effect SEO??? It doesn't make any sense.

I have many sites on Bluehost.com. I've never had a problem. The only time you need to consider diversifying your hosting is if you are worried about business continuity and you want to mitigate risk.

And I very much doubt Google Bot can read your back end/hosting details anyway. I find it hard to believe that Google can harvest domain information i.e. the number of sites hosted on one hosting account. If you're that paranoid about it then signup to Whois Privacy.

Google reads what it can and that is up to YOU...