Several websites list companies that are friendly and not friendly regarding gun rights. Some of the companies have policies against guns on their property, and others are involved in other anti-gun initiatives. Some of the more well known companies in the news are Starbucks (friendly), and Darden restaurants (Olive Garden, Red Lobster, etc) which have been known to be UN-friendly.
NRA-ILA :: National Organizations With Anti-Gun Policies
Next is a website from Virginia that lists several businesses, but some of the policies against guns are not nationwide, but only in certain local franchises there. You have to read the policies carefully and even contact your local businesses to find out more.
Virginia Citizens Defense League, Inc. (VCDL) Fridays
A quick phone call or email would be a good way to tell these businesses what you think about their policies. Where you spend your money would send a big message. I tell them that I don't feel safe in a "gun free" zone. These business owners and managers need to be educated with the truth so they can understand the "gun control" myth.