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Theoretically, if I bought more than 50% of a company's stocks, will I own the company?
You'll own whatever fraction you bought. To own the company (as in, boolean - yes or no) you need to buy 100% of the outstanding stock. RE controlling the company, in general the answer is yes - although the mechanism for this might not be so straight forward (ie. you may have to appoint board members and may only be able to do so at pre-set intervals) and there may be conditions in the company charter designed to stop this happening. Depending on your jurisdiction certain ownership percentages can also trigger the need to do certain things so you may not be able to just buy 50% - in Australia when you reach 20% ownership you have to launch a formal takeover bid.