Bill Ackman, David Tepper, and other billionaire fund managers are quietly piling into Amazon

An elite coalition of institutional hedge fund managers has converged on a single investment thesis: Amazon represents exceptional value within the artificial intelligence trade despite its $2.5 trillion market capitalization. According to Q1 2026 regulatory filings released in May, a roster of sophisticated capital allocators—including David Tepper's Appaloosa Management, Seth Klarman's Baupost Group, Al Gore's Generation Investment Management, Lewis Sanders' Sanders Capital, and Bill Ackman's Pershing Square—have independently enlarged their Amazon positions to material portfolio weights.

The scale of these commitments reflects unusual alignment among typically independent operators. For both Tepper and Klarman, Amazon has become their single largest portfolio holding. Pershing Square's position illustrates the intensity of conviction: Ackman initiated his Amazon stake approximately one year ago from scratch and has since accumulated a position now worth $3.11 billion, representing 20.70% of the fund's equity portfolio and generating a 28% unrealized gain on a $2.43 billion cost basis. Sanders Capital executed a more aggressive expansion, doubling its stake in Q1 2026 to 29.8 million shares valued at approximately $6.2 billion, establishing Amazon as the firm's third-largest holding after TSMC and Alphabet.

The fundamental catalyst driving this convergence is a pronounced valuation disconnect within the AI sector. While comparable technology equities with direct AI exposure have appreciated dramatically—Nvidia up 35%, Intel up 496%, Micron Technology up 719%—Amazon's stock performance has remained subdued, gaining only 3.4% year-to-date and 10.1% over the past 12 months. This underperformance occurs despite accelerating operational results, particularly within Amazon Web Services, the company's cloud infrastructure division and a primary beneficiary of enterprise AI infrastructure spending. During Amazon's most recent earnings report, CEO Andy Jassy characterized AWS's performance as achieving its "fastest growth in 15 quarters," underscoring robust demand momentum that has not yet translated into corresponding equity valuation expansion.

For value-oriented institutional investors, this gap between business momentum and stock price appreciation presents a classic opportunity set: a profitable, growing megacap technology company with material AI exposure trading at a valuation discount to historical precedent and relative to operationally similar peer companies. The conviction demonstrated by these multiple independent capital allocators suggests sophisticated money managers identify Amazon as fundamentally mispriced relative to its AWS growth trajectory and broader artificial intelligence exposure.