Citadel Boss Ken Griffin invests $4.2 billion in the tech boom - The portfolio speaks volumes

The latest insider movements show: Ken Griffin and his hedge fund Citadel are heavily investing in artificial intelligence and technology stocks. In Q3 2025, Griffin’s team made significant moves, adding approximately $4.2 billion worth of positions.

Focus on Microsoft, Meta, and Apple

Especially interesting: Citadel acquired 1.99 million shares of Microsoft for $1.03 billion. This indicates that Griffin trusts the tech giant’s cloud and AI infrastructure. But that was just the beginning. Meta received even more attention – 1.95 million shares worth $1.43 billion were added to the portfolio.

Apple was also not left out: an additional 2.56 million shares were purchased, representing a capital expenditure of $652 million. A clear message from the most successful investor: these companies are his top picks in the tech sector.

Broader Engagement with AI Players

Ken Griffin is also diversifying strategically. Tesla, Alphabet, and NVIDIA also received larger positions. Only Amazon was reduced – by 39 percent, in fact. This could suggest that Griffin sees less growth potential in streaming and cloud business compared to other areas.

Especially interesting are the smaller but significant investments in specialized players: quantum computing companies like Rigetti and D-Wave, as well as biotech firm Summit Therapeutics. With this, Citadel is positioning itself not only with established tech giants but also with future-oriented niche technologies.

The Pattern Behind It

What does Griffin’s investment strategy show? It is a clear commitment to artificial intelligence, cloud computing, and disruptive technologies. The hedge fund boss is following the global trend that AI infrastructure and quantum technology are the next major growth drivers.