Wouldn't they be? These days, most people and institutions who own shares of a company tend to own a similar fraction of the shares of the competitors, too. Th

Wouldn't they be? These days, most people and institutions who own shares of a company tend to own a similar fraction of the shares of the competitors, too. That's the basic premise of index funds. Presumably when they vote, their interest will be in seeing the entire index go up, not one company stealing the market share of another.