Hedge fund activism has become a central market-based mechanism for disciplining public-company managers as equity ownership shifts toward passive institutions that rarely initiate engagement. We review two decades of evidence through a cost-benefit framework that organizes which firms get targeted, when campaigns escalate, and how campaign costs shape activist returns. Activism produces durable shareholder gains and real operating improvements, supported by a coalition in which passive investors prove reliable supporters of campaigns launched by others. Crucially, the discipline extends to firms never targeted. Policy evaluations that count only direct effects at targeted firms systematically understate the cost of constraining activism.
Greg Brown, UNC Kenan-Flagler Business School; Institute for Private Capital
Nickolay Gantchev, University of Virginia; CEPR; ECGI
Christian Lundblad, UNC Kenan-Flagler Business School; Institute for Private Capital
Director, Senior Fellow, IPC; Richard Levin Distinguished Professor of Finance, University of North Carolina, Kenan-Flagler Business School
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