Billionaire Investing Legend Buys $4,200,000,000 of Assets in Massive Bet on AI and Tech Stocks

Billionaire Citadel CEO Ken Griffin just poured a massive amount of money into big bets on the future of technology and artificial intelligence.

For starters, Citadel’s latest 13F filing shows Griffin ramped up stakes in six Magnificent Seven stocks during Q3 2025, adding over $4.2 billion in value based on September 30th closing prices.

He doubled Citadel’s Microsoft (MSFT) position with 1.99 million new shares worth $1.03 billion.

Meta (META) saw a 12,693% surge, with Citadel adding 1.95 million shares valued at $1.43 billion. The firm’s Apple (AAPL) stake more than doubled via 2.56 million shares, adding $652 million.

Tesla (TSLA) increased 279% with 1.1 million shares worth $489 million. Alphabet (GOOG) holdings jumped 200% on 1.25 million shares, adding $304 million.

Nvidia (NVDA) rose 21% with 1.73 million shares valued at $323 million.

Meanwhile, Griffin trimmed Amazon (AMZN) by 39%, selling 2.1 million shares worth $461 million.

Outside of the Mag 7, Griffin added smaller positions in quantum stocks 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 bought a new 650,000 share stake in Summit Therapeutics (SMMT), worth $13 million.

Overall, Citadel’s portfolio grew to $618 billion.

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