Citadel's Ken Griffin boosts tech and AI stakes by $4.2 billion in Q3 2025

In Q3 2025, according to Citadel's latest 13F filing, Ken Griffin increased positions across six Magnificent Seven stocks, adding over $4.2 billion in value based on September 30 closing prices. Microsoft was doubled with 1.99 million new shares worth $1.03 billion, Meta holdings rose 12,693%, and Amazon was reduced by 39%.