Ken Griffin, CEO of billionaire Citadel, just put a huge amount of money into big bets on the future of technology and artificial intelligence.
Let’s start with Citadel’s latest 13F filing shows Griffin increased his holdings in six Magnificent Seven shares in the third quarter of 2025, adding more than $4.2 billion in value based on September 30 closing prices.
He doubled Citadel’s position in Microsoft (MSFT) with 1.99 million new shares worth $1.03 billion.
Meta (META) rose 12.693%, with Citadel adding 1.95 million shares worth $1.43 billion. The company’s stake in Apple (AAPL) more than doubled via 2.56 million shares, adding $652 million.
Tesla (TSLA) rose 279% with 1.1 million shares worth $489 million. Alphabet (GOOG) holdings rose 200% on 1.25 million shares and added $304 million.
Nvidia (NVDA) rose 21% with 1.73 million shares worth $323 million.
Meanwhile, Griffin cut Amazon (AMZN) by 39%, selling 2.1 million shares worth $461 million.
Outside of Mag 7, Griffin added smaller positions in quantum stock Rigetti (RGTI), amounting to 51,700 shares and $1.5 million, along with D-Wave (QBTS) at 169,000 shares for $4.2 million.
Griffin also purchased a new 650,000 share stake in Summit Therapeutics (SMMT), valued at $13 million.
In total, Citadel’s portfolio grew to $618 billion.
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Generated image: Midjourney