Bio & context
Founder of Citadel, one of the world's most successful hedge funds and market makers, combining quantitative strategies with global macro.
Ken Griffin started trading from his Harvard dorm room in 1987 with a fax machine and $265,000 raised from family. He founded Citadel in 1990 at age 22 with $4.6M. Citadel pioneered multi-strategy hedge funds, combining quantitative equity, fixed income arbitrage, global macro, and market-making. Griffin nearly lost everything during the 2008 crisis (fund down 55%), but refused to close and staged one of history's greatest comebacks. Citadel Securities, his market-making arm, handles 40% of all US retail stock trades and 25% of Treasury market volume. Known for recruiting top talent from MIT, Caltech, and Goldman Sachs, paying $400M for a penthouse, and donating $150M+ to Harvard. His net worth exceeds $38 billion. Citadel has posted 30+ years of returns averaging 19% annually.
Philosophy in their own words
Combine quantitative rigor with human judgment. Diversify across strategies and geographies. Attract the best talent and give them resources.
Approach & method
Multi-strategy approach: quantitative equity models, global macro, convertible bond arbitrage, credit strategies, market-making. Heavy use of technology, data science, and risk management systems. Diversification across 1000+ positions and dozens of uncorrelated strategies. High leverage during favorable conditions.
Key strategies
- 1. Multi-Strategy Diversification: Equity, fixed income, macro, credit, market-making all under one roof
- 2. Quantitative Edge: Data-driven models, machine learning, pattern recognition
- 3. Market Making: Provide liquidity in exchange for bid-ask spread profits
- 4. Risk Management: Real-time monitoring, stress testing, position limits
- Founded Citadel (1990) with $4.6M, now $63B AUM
- Citadel Securities handles 40% of US retail equity volume
- Survived 2008: Down 55%, recovered to new highs by 2010
- 30+ years of positive returns averaging 19% annually
- Built Citadel Securities into largest market maker
- Earned $4.1B personally in 2022 (highest ever for hedge fund manager)
- Donated $150M to Harvard, $125M to University of Chicago
- Paid record $238M for NYC penthouse, $122M for London home
Key metrics
- 19% average annual returns (1990-2024)
- Only 5 losing years in 34 years
- $63B assets under management (2024)
- Wellington Fund flagship: 15.3% average return (1990-2023)