Billionaire Bill Ackman has a substantial portion of his portfolio invested in Alphabet and Chipotle Mexican Grill.Billionaire Bill Ackman is the founder and CEO of Pershing Square Capital Management, a hedge fund that returned 183% in the five-year period that ended in June 2024. During the same period, the S&P 500 (^GSPC 0.20%) advanced just 102%.Ackman is no stranger to the public spotlight. His failures and successes have been widely chronicled by the media, including the $1 billion he lost betting agai ...