A new playbook is helping private equity investors earn strong returns, at a time when buyouts have never been bigger or bolder. As deal prices and the cost of debt rise, private equity firms can no longer count on leverage and financial maneuvers to deliver outsized gains. To succeed in this environment, private equity firms need a different formula. As soon as a deal closes, they must stop thinking like investors and start acting like company owners intent on making their business more valuable. The new owner-activists follow a disciplined process for staging, accelerating, and profiting from breakthrough operational improvements. And it's one that corporate acquirers would do well to adopt.