As index fund ownership grows as a percentage of shares outstanding, the voting power of index fund managers increases. (charlessizemore.com)
There is a whole industry and process around that date, when index fund managers, hedge funds, and others try to play the game. (money.stackexchange.com)
People like Warren Buffett and other index fund managers have expert staffs that can do due diligence with personal visits to the many components of a company. (newretirement.com)