A list of the PRO second amendment businesses will be a lot shorter and save internet bandwidth.
In fact, outside of the sporting goods industry, you will find few business that will even admit the 2nd amendment exists!
Actually I think most retail businesses don’t think about it much at all. If they did they would be posting signs not permitting weapons.
The one that stands out in my mind is the Cinemark theater chain (made famous in Aurora CO, or perhaps infamous), which states explicitly that no weapons are permitted. It is the only theater chain where I have seen such a sign. Though I do admit my sample size isn’t that large.
Hallmark cards has had an anti-gun stance for a long time.
Oddly enough they are pretty good on family friendly movies etc.
I’ve seen many an open carry patron inside of Cracker Barrel, albeit a Cracker Barrel in Texas....