Over the past decade, directors and executives of public companies have increasingly found themselves under scrutiny from the managers of private equity funds—especially as acquisitions by such funds have come to involve firms with market capitalizations of more than $20 billion. For some public companies, this gaze has been welcome. Individual fortunes have been made in deals to take companies private. But for most public companies, the outsize returns of a few private equity funds have posed a challenge to their own directors and executives. If private equity can get that kind of performance out of a company, why can’t they?

A version of this article appeared in the November 2007 issue of Harvard Business Review.