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How would you know they're voting in your interests?
I've never known how any other shareholder voted in any of the stock I owned. For all I know they could have been voting completely contrary to what I'd wanted.
No. Unless you own enough of a stock to vote and make a difference, stock ownership is not about influencing a company but just about hoping the value of the stock will rise, and there are many theories about why that might happen, from fundamental to technical analysis to people who invest based on the phase of the moon, divination, tips from friends, insider trading, trend following, news, etc.