collective nouns - Question on usage of "clientele"

Between these two sentences, which (if either) is correct in American English:

Our clientele range from a small non-profit to a billion dollar corporation...

or

Our clientele ranges from a small non-profit to a billion dollar corporation...

A collective noun is usually treated as singular. If that holds true here, then "ranges" would be correct. But that just feels wrong. For some reason I can't quite articulate, "range" feels right.

Thoughts? Which is correct and why?