That's a tough one. It is virtually impossible to know what companies own, and sponsor activities that may go against your personal convictions and beliefs. If you are aware of something that a company is doing, certainly it has been shown in the past that boycotts of certain products do send a message to the company, but whether things actually change beyond that, has not been proven.
Here is an article regarding the subject...
http://www.theloop.ca/news/all/you-a...actually-work-