Where can I get a list of relevant indexes or most important similar stocks for a specific ticker

Typically if I trade oil stocks I'll keep an eye on USO as oil stocks often trade together. Is there anywhere where this information is readily available, where I can type in a ticker and find out who the big players are in that sector and the most representative indexes for that sector?

Submitted May 02, 2016 at 11:15PM by dumbquestionsasker http://ift.tt/24uRFog