Ken Griffin, CEO of Citadel LLC speaks on Squawk on the Street at the World Economic Forum in Davos, Switzerland on Jan. 21, 2026.Billionaire investor Ken Griffin's various hedge funds at Citadel generated positive returns in February, navigating a volatile month for markets as macro uncertainty and disruption from artificial intelligence whipsawed asset prices.The firm's flagship multistrategy Wellington fund rose 1.9% in February, bringing its year-to-date gain to 2.9%, according to a person familiar with ...