Billionaire Bill Ackman will turn Howard Hughes Holdings into a modern-day Berkshire Hathaway in an effort to recreate Warren Buffett’s success. Ackman’s hedge fund Pershing Square Capital Management recently took a stake in Amazon, an artificial intelligence stock up 855% in the last decade. Amazon has three major growth opportunities in e-commerce, digital advertising, and cloud computing, and the company is using AI to boost revenue and improve margins.