Not sure about all of them, but the below link is a CNBC article from 2014 naming some of them and saying how only the advertisers have impact on the NFL — not the fans. http://www.cnbc.com/2014/09/17/nfl-sponsor-wrath-can-they-change-the-pro-football-league.html
Maybe we should contact the NFL and ask them if they could post on their web page a list of their current sponsors so we can boycott them? :)