Key Takeaways
- • Mega-cap concentration surge: Q1 2026 13F filings reveal that top-tier hedge funds—Pershing Square, Appaloosa, Himalaya Capital, and Berkshire Hathaway—are converging on three names: Amazon, Alphabet, and Uber, signaling an aligned thesis on AI infrastructure and tech dominance.
- • Amazon positions dramatically sized: Bill Ackman's Pershing Square holds Amazon at 17.4% of portfolio weight, while David Tepper's Appaloosa increased its stake to 15.2% after nearly doubling share count in Q1 2026; Amazon delivered 60.69% EPS beat ($2.78 vs. $1.73 consensus) and AWS grew 28% YoY with 37.7% operating margins.
- • Strategic AI infrastructure bet: The convergence reflects shared conviction that Amazon is "the toll booth for enterprise AI compute," supported by landmark capacity agreements with OpenAI (2 GW Trainium) and Anthropic (5 GW) and planned $200 billion capex in 2026, though stock remains up only 10.37% YTD through July 20.
- • Alphabet's concentrated play: Himalaya Capital maintains 44.8% portfolio weight in Alphabet (GOOGL/GOOG combined), while Berkshire Hathaway—historically avoiding the search giant—more than doubled its GOOGL stake and opened a new GOOG position representing ~6% of equity book, marking a significant strategic reversal that signals exceptional conviction on fundamentals.
- • Valuation disconnect amid beats: Alphabet posted Q1 2026 revenue growth of 21.8% to $109.90 billion with significant EPS beats, yet the stock appears to be trading below the conviction levels reflected in these mega-fund accumulations.
Summary
The Q1 2026 13F filings, disclosing holdings as of March 31, 2026 and filed May 15, 2026, have exposed a remarkable convergence among Wall Street's most sophisticated and concentrated investors. Bill Ackman's Pershing Square, David Tepper's Appaloosa, Li Lu's Himalaya Capital, and Warren Buffett's Berkshire Hathaway are all significantly overweighting the same handful of mega-cap technology stocks—Amazon, Alphabet, and Uber—suggesting a unified and deeply researched thesis driving their positioning.
Amazon has emerged as a standout conviction play within two of the most closely watched portfolios on the Street. Pershing Square carries Amazon at approximately 17.4% of portfolio weight, representing one of its largest holdings, while Appaloosa's Amazon position sits near 15.2% following Tepper's aggressive move to nearly double his share count during the quarter. The fundamental backdrop supporting these large positions is compelling: Amazon delivered a Q1 2026 EPS of $2.78 against consensus expectations of $1.73, a beat of 60.69%, while AWS—the company's high-margin cloud division—accelerated to 28% year-over-year growth, marking its fastest pace in 15 quarters, with operating margins at 37.7%. The investment thesis centers on Amazon functioning as "the toll booth for enterprise AI compute." Strategic capacity agreements with OpenAI (approximately 2 gigawatts of Trainium capacity) and Anthropic (up to 5 gigawatts) provide multi-year revenue visibility, underpinned by the company's aggressive $200 billion capex commitment for 2026. Despite these tailwinds, Amazon shares have appreciated only 10.37% year-to-date through July 20, suggesting potential upside disconnect from fundamentals.
Alphabet represents an even more concentrated positioning, with Himalaya Capital maintaining a combined GOOGL/GOOG weight of approximately 44.8% of its portfolio. The most significant signal comes from Warren Buffett's Berkshire Hathaway, which historically steered clear of the search giant but has now more than doubled its GOOGL stake while simultaneously opening a new GOOG position representing roughly 6% of Berkshire's equity book. This reversal of Buffett's longstanding skepticism toward Alphabet carries substantial strategic weight. The fundamental backdrop supports the pivot: Alphabet posted Q1 2026 revenue growth of 21.8% to $109.90 billion and delivered a significant EPS beat, though the stock appears to trade at a discount relative to the conviction levels reflected in these mega-fund accumulations.
The concentration of these bets among elite investors suggests that this is not passive indexing or momentum chasing, but rather a deliberate, research-intensive positioning around AI infrastructure dominance and cloud compute supremacy. The fact that managers with diverse track records and investment philosophies are converging on the same three names underscores the conviction driving these allocations through mid-2026.
Amazon has emerged as a standout conviction play within two of the most closely watched portfolios on the Street. Pershing Square carries Amazon at approximately 17.4% of portfolio weight, representing one of its largest holdings, while Appaloosa's Amazon position sits near 15.2% following Tepper's aggressive move to nearly double his share count during the quarter. The fundamental backdrop supporting these large positions is compelling: Amazon delivered a Q1 2026 EPS of $2.78 against consensus expectations of $1.73, a beat of 60.69%, while AWS—the company's high-margin cloud division—accelerated to 28% year-over-year growth, marking its fastest pace in 15 quarters, with operating margins at 37.7%. The investment thesis centers on Amazon functioning as "the toll booth for enterprise AI compute." Strategic capacity agreements with OpenAI (approximately 2 gigawatts of Trainium capacity) and Anthropic (up to 5 gigawatts) provide multi-year revenue visibility, underpinned by the company's aggressive $200 billion capex commitment for 2026. Despite these tailwinds, Amazon shares have appreciated only 10.37% year-to-date through July 20, suggesting potential upside disconnect from fundamentals.
Alphabet represents an even more concentrated positioning, with Himalaya Capital maintaining a combined GOOGL/GOOG weight of approximately 44.8% of its portfolio. The most significant signal comes from Warren Buffett's Berkshire Hathaway, which historically steered clear of the search giant but has now more than doubled its GOOGL stake while simultaneously opening a new GOOG position representing roughly 6% of Berkshire's equity book. This reversal of Buffett's longstanding skepticism toward Alphabet carries substantial strategic weight. The fundamental backdrop supports the pivot: Alphabet posted Q1 2026 revenue growth of 21.8% to $109.90 billion and delivered a significant EPS beat, though the stock appears to trade at a discount relative to the conviction levels reflected in these mega-fund accumulations.
The concentration of these bets among elite investors suggests that this is not passive indexing or momentum chasing, but rather a deliberate, research-intensive positioning around AI infrastructure dominance and cloud compute supremacy. The fact that managers with diverse track records and investment philosophies are converging on the same three names underscores the conviction driving these allocations through mid-2026.
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