The $4.2 Billion Bet: How Ken Griffin Is Positioning Citadel for the AI Era

Ken Griffin’s latest moves reveal a decisive shift in Citadel’s investment playbook. According to the firm’s Q3 2025 13F filing, the hedge fund giant doubled down on artificial intelligence and technology infrastructure with a staggering $4.2 billion capital deployment—a clear signal that Griffin sees the next wave of returns riding on computational power and digital transformation.

Meta and Microsoft Lead the Charge

The most striking allocation went to Meta, where Citadel acquired 1.95 million shares worth $1.43 billion, marking a bold conviction in social media’s AI-driven rebrand. Equally significant was the Microsoft play: Ken Griffin’s team scooped up 1.99 million shares valued at $1.03 billion, betting heavily on enterprise AI adoption and cloud infrastructure dominance.

Broadening the Tech Foundation

Apple didn’t escape Griffin’s attention either. Citadel added 2.56 million shares to its position, injecting an additional $652 million into the iPhone maker as the company navigates AI integration across its ecosystem. Beyond the mega-caps, the firm ramped up exposure to Tesla, Alphabet, and NVIDIA—the holy trinity of AI infrastructure, autonomous systems, and chip design.

Strategic Rebalancing and Emerging Bets

Interestingly, Ken Griffin cut Amazon holdings by 39%, suggesting a tactical rotation rather than blanket tech bullishness. On the contrarian side, Citadel made smaller but symbolic bets on quantum computing pioneers Rigetti and D-Wave, alongside biotech player Summit Therapeutics—moves that hint at Griffin’s longer-term conviction in disruptive computing paradigms.

This portfolio architecture paints a picture of calculated exposure to AI’s current dominance while hedging against the tech giants’ potential disruption. For market observers, it’s a masterclass in how sophisticated capital deploys when conviction runs deep.