2 Billionaire Investors Own Amazon Stock. Should You Buy It Too?

Billionaire investors Bill Ackman and David Tepper hold sizable positions in Amazon (AMZN), underscoring a long-term bullish case driven by three engines: AWS, advertising, and retail. AWS produced 57% of Amazon’s $80 billion operating income in 2025 and grew ~20% that year, while advertising has topped $60 billion annually. Retail remains dominant in scale with about $426 billion in U.S. sales and $162 billion internationally, feeding data into ads and cloud demand. Offsetting strengths are slowing retail growth, rising competition (e.g., Temu, Shein), and heavy AI-related spending — Amazon plans roughly $200 billion in 2026 for data centers, chips and robotics — which could pressure margins and cash flow and increase volatility. The piece is market commentary weighing a long-term buy thesis against near-term risks; investors are urged to assess time horizon and risk tolerance before following billionaire stakes.