Do Shareholders to a company have possible privleges to make their voice heard when a decision is being made?

You do have a voice, it's called a proxy ballot. You may get one of those in the mail once a year. But generally, by that election, those are the people who hire the CEO, and he/she hires the VP's...right on down the line. People like WB have millions of shares in a company, and if he threatened to sell all his shares in one day, the place would loose value too quickly, so they listen to what he says (most times). You and me, we don't own that many shares, so when we get upset with a company, and try to do something, they tell us to take a hike. Long time share holders, with relatively few shares, don't matter either. To answer your question, Yes.