Billionaire investor Ken Griffin built Citadel Advisors into one of the most successful hedge funds in modern Wall Street history, generating billions in profits through a data-driven, multi-strategy investing approach that spans equities, fixed income, commodities, and global macro markets.
While Citadel is known for its highly diversified portfolio construction, the firm’s latest disclosures show significant exposure to the Big Tech names continuing to drive much of the market’s recent strength, with NVIDIA (NASDAQ:NVDA | NVDA Price Prediction), Amazon (NASDAQ:AMZN), and Microsoft (NASDAQ:MSFT) ranking among the fund’s largest disclosed positions.
NVIDIA Is Citadel’s Largest Individual Equity Position
NVIDIA Corporation stands as Citadel’s largest disclosed individual equity holding, making up roughly 2.8% of the firm’s portfolio after Ken Griffin’s hedge fund increased its stake by nearly 120% last quarter.
That aggressive buying suggests Citadel remains highly bullish on the AI chip leader despite NVIDIA already becoming one of the market’s biggest winners. The company reported fourth-quarter fiscal 2026 revenue of $68.13 billion, up 73% year over year, while data center revenue climbed 75% to $62.31 billion.
Management also guided for approximately $78 billion in first-quarter fiscal 2027 revenue, showing demand for NVIDIA’s AI chips remains extremely strong. Citadel’s massive recent buying suggests Griffin believes the AI infrastructure boom is still in its early innings.
Amazon Is Another Major Citadel Conviction Bet
Amazon ranks as Citadel’s second-largest disclosed stock holding, representing roughly 2.3% of the portfolio after Griffin increased the fund’s position by more than 336% last quarter.
That massive buying spree signals growing conviction in Amazon’s long-term role as one of the dominant infrastructure players powering enterprise AI adoption. Amazon Web Services posted 24% year-over-year revenue growth to $35.58 billion in the fourth quarter of 2025. Amazon has committed to deploying approximately $200 billion in capital expenditures in 2026, the majority directed at AI infrastructure. The advertising business grew 23% year-over-year to $21.32 billion in Q4.
Amazon also plans to invest roughly $200 billion in capital expenditures during 2026, with much of that spending expected to support AI and cloud infrastructure expansion. Citadel’s aggressive accumulation suggests Griffin believes Amazon remains one of the clearest long-term winners in the AI arms race.
Microsoft Adds Stability to Citadel’s AI Portfolio
Microsoft remains another major technology holding for Citadel at roughly 1.1% of the portfolio, though Griffin trimmed the position by roughly 18% last quarter.
Despite the reduction, Microsoft still remains one of the fund’s largest technology investments. The company continues to benefit from accelerating enterprise AI and cloud demand, with Azure revenue growing 39% year over year in its latest quarter.
Microsoft also reported commercial remaining performance obligation of $625 billion, up 110% year over year, highlighting a massive backlog of contracted future business. While Griffin trimmed the stake modestly, Citadel maintaining such a large position suggests the firm still views Microsoft as one of the most durable long-term AI beneficiaries in the market.
What Citadel Owns and Why It Matters
Taken together, Citadel’s largest technology holdings suggest Ken Griffin is positioning heavily around the continued dominance of Big Tech and the belief that AI infrastructure spending remains in the early innings. Rather than betting on speculative smaller players, Griffin appears focused on owning the established market leaders with the scale, balance sheets, and infrastructure to benefit most from the next wave of enterprise AI adoption.
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