One of the most profitable hedge funds in history, Ken Griffin's Citadel may end 2025 with the lowest return in seven years, Bloomberg <a href="https://www.bloomberg.com/news/articles/2025-12-19/citadel-posts-worst-return-since-2018-as-natural-gas-bets-falter">reported</a>. The fund's bet on the natural gas market, which previously brought it billions, underperformed this year, the agency said.

Ken Griffin's hedge fund produced its worst results in 7 years. What deals failed?

Berkshire Hathaway Inc.

Icahn Enterprises L.P.

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