Billionaire Bill Ackman's Billion-Dollar Bet on Amazon Isn't His Largest Position -- This One Is

Core Insights - Billionaire investor Bill Ackman, founder of Pershing Square, is known for high-conviction, concentrated investments, often holding fewer than a dozen stocks in his portfolio, which has historically yielded outsized returns [1][2] Investment Strategy - Ackman recently acquired a significant stake in Amazon, purchasing 5.82 million shares valued at approximately $1.3 billion, representing about 9% of his U.S. equity portfolio, but this is not his largest position [4][5] - Uber Technologies is Ackman's largest holding, comprising about 21% of his fund at $2.8 billion, indicating a strong preference for this stock [4][6] Company Analysis - Ackman views Uber as one of the best-managed and highest-quality businesses globally, available at a substantial discount to its intrinsic value, which he describes as a rare opportunity for a large-cap company [6][7] - Uber has transitioned from a cash-burning disruptor to a disciplined operator with a strong competitive advantage in mobility and delivery, serving 180 million users per quarter [7][9] Competitive Advantage - The strength of Uber's business model lies in its network effects, where the interaction between riders and drivers, as well as merchants and consumers in food delivery, creates a self-reinforcing cycle that enhances its market position [9]