In recent years, in conjunction with rising inequality in the United States, there has been a decisive shift from broad-based ownership of firms to much more concentrated forms of ownership in both private and public markets. Private equity markets are concentrated by legal definition: relatively few people are qualified to participate directly. Yet private equity has become the preferred method of capital formation, epitomized by “unicorns,” firms valued at over $1 billion without being publicly traded. Public equity markets are dominated by funds with trillions of dollars under management, and small staffs, who are in effect “guardians” for the portfolios that ensure long-term stability for individuals and institutions, notably through retirement and endowments. The governance of the U.S. economy has to a surprising degree become a matter of grace: the nation now relies on a small elite to make good decisions on its behalf about the allocation of capital, the governance of firms, and the preservation of portfolio value. This consolidation of ownership rivals that of the late 19th century, and may challenge the law to address the equity markets in new ways.