Institutional ownership has grown tremendously over recent decades, rising to more than 70 percent of U.S. public firms. The composition of institutional ownership has also changed, with a remarkable growth in passive funds: The fraction of equity mutual fund assets held by passive funds has increased six-fold, from around 5 percent to 30 percent. The Big Three index fund managers alone now cast about 25 percent of votes in S&P 500 firms. How active and passive asset managers monitor and engage with their portfolio companies has thus become of utmost importance for the governance and performance of public firms.
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