At the moment all those sites are down from my side (maybe you made a DNS change recently EDIT: didn't realize that was just an example name) but if you want to totally eliminate the problem of that showing up at all in search result while giving yourself an extra sales feature then implement custom domains so your customers don't have the domain name of yours included in their url at all.

Your customers will like it as well and find it easier for their employees to remember or refer to the url

Having a hard time deciphering anything, especially this:

(Skip to last paragraph for solution)

People search for a variety of nonsense things out of laziness. I never quite got that, but the public does what it does.

In other words, those searches would be meaningless. You are getting customers that already use it.

If on the other hand, you are imagining thousands of people searching and clicking...well that would not make sense as you say they are already using it.

My only conclusion is that you are assuming thousand of people searching for you, and clicking, on a daily basis, is a very wrong assumption.

Now I can also assume that if someone searches for facebook, google might think they want to login and show the login page #1. But again, those would be useless search results to the company. (see last paragraph)

I can't believe thousands of people daily are searching for you using your company name.

One easy solution would be to work with google. On the portal page, have a clear message to direct people to join if they are not yet a customer. Using FB as yet another example, facebook.com has exactly that. A form to login, a form to join. Done and done.

Paul

You didn't read what he wrote Paul. Thats why you are having a problem deciphering.

Has to do with whats coming up in the search results NOT how many people are searching. Even if its 5 for the month you still would want your own main domain to be displayed first not the sub domain of a client.

P.S. I'd also caution the OP to make sure he is also logged out of Google and not getting personalized results.

Simple, noindex the client sub-domain/s.

Why in the world would you index private pages? Only the client needs to see the client page.