Billionaire investor Bill Ackman aims to emulate Warren Buffett’s success and has been exploring a modern version of Berkshire Hathaway. His investment strategy focuses on acquiring substantial stakes in undervalued stocks, often advocating for management changes to enhance shareholder value. Currently, Ackman’s $13 billion portfolio has 44% concentrated in three main companies: Uber (17%), Alphabet (14%), and Brookfield (13%), with Ackman believing these stocks are primed for significant growth based on their business fundamentals.