Who should determine the will of this corporate-person? The shareholders? The board? The managing director? If I own a stake in an index fund, how do I propagat

Who should determine the will of this corporate-person? The shareholders? The board? The managing director? If I own a stake in an index fund, how do I propagate my will proportionately to the actions of these corporations? Corporate-persons is an area fraught with agent problems, and should therefore not be allowed.