Bill Ackman, the prominent investor behind Pershing Square Capital, is known for his focused approach to investing, typically selecting just a handful of companies at a time. His strategy revolves around identifying high-quality businesses whose stocks he believes are undervalued compared to their true worth. Once invested, Ackman leverages his position as a major shareholder to influence company management and unlock hidden value, aiming to drive long-term growth and returns for his fund.