The internal memo was titled "Citadel Widens Lead as Most Profitable Hedge Fund of All Time. ": Another big year for billionaire Ken Griffin and Citadel has extended the lead the Miami-based money manager has over its peers. While Citadel didn't reach the lofty heights it hit in 2022 — when it made the most-ever for investors of any hedge fund in a single year, according to data from LCH Investments — the $56 billion firm still generated $8.1 billion in gains last year.