Hi there,
If you define Reseller Hosting as a standard account on Shared server, with a "Root and Reseller Admin Panel" management level of cPanel (or any other similar management level in other control panels), than the answer would be probably "Yes". You'd be surprised that even some of the most popular Shared Hosting providers you know are just Resellers.
At least 5 of those you know use Softlayer's (The Planet) ASN and do not own the servers, switches and routers as well as the infrastructure they use. They do not their own network and uplinks to Internet.
In order to understand whether any hosting provider is a Reseller of another company or is a "Master host", just go to whois.sc and put its domain name there. Then go on the "Server stats" and you will see an ASN number. Check that one in Google or another Search engine to see whether the company operates its own network.
Hope that this helps!