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Event-driven investment master who used credit default swaps to short the subprime mortgage bubble
John Paulson (born 1955) is an American hedge fund manager and founder of Paulson & Co. He holds an MBA from Harvard Business School and previously worked at Bear Stearns. He founded Paulson & Co. in 1994, specializing in event-driven investing and risk arbitrage strategies. In 2007-2008, he purchased massive amounts of credit default swaps (CDS) to short subprime mortgage securities, earning approximately $20 billion for his fund during the financial crisis with personal gains of about $4 billion. New York Times journalist Gregory Zuckerman called it The Greatest Trade Ever. This trade made Paulson famous overnight and also sparked widespread controversy about Wall Street short-selling. Subsequently, his investments in gold, healthcare, and other areas had mixed results, and in 2020 he converted Paulson & Co. into a family office.
Specific events such as mergers, restructurings, bankruptcies, and regulatory changes cause systematic mispricings in related securities. Through deep research into these events, one can discover risks or opportunities not fully reflected by the market, achieving predictable excess returns.
Source: Paulson & Co. investor letters, 2000-2007; The Greatest Trade Ever by Gregory Zuckerman, 2009
The best investment opportunities have limited downside risk (lose at most the full investment) but enormous upside potential (potentially multiple times or even dozens of times return). The subprime short perfectly embodied this principle: the cost of buying CDS was limited, but if subprime collapsed, the return would be astronomical.
Source: The Greatest Trade Ever by Gregory Zuckerman, 2009, Chapter 8
In the subprime trade, Paulson's team spent over a year deeply analyzing the underlying asset quality of subprime mortgage securities, discovering risks severely underpriced by the market. This deep research capability is the core competency behind Paulson's consistent excess returns.
Source: The Greatest Trade Ever by Gregory Zuckerman, 2009
In 2007, all of Wall Street believed subprime was safe; Paulson's deep research led him to the opposite conclusion. The stronger the market consensus, the more severe the mispricing often is, and the greater the contrarian opportunity. But contrarian investing requires solid research support, not simply being different.
Source: Paulson & Co. investor letters, 2007; The Greatest Trade Ever by Gregory Zuckerman, 2009
Identify specific events that can cause market repricing (mergers, bankruptcies, regulatory changes) and establish positions before the event occurs
In the early days of Paulson & Co., Paulson mainly did merger arbitrage: when a company announced being acquired, its stock price was often below the acquisition price, and Paulson earned the spread by buying the target company's stock.
Use credit default swaps (CDS) as insurance instruments to gain asymmetric exposure to credit events at limited cost
Paulson purchased CDS on subprime mortgage securities at a relatively cheap annual cost (about 1-2%). When subprime collapsed, these CDS values soared dozens of times. The asymmetric structure of limited cost and unlimited upside is the essence of this trade.
Systematically analyze the formation mechanism, inherent fragility, and catalysts for bubble collapse, establishing short positions before the bubble bursts
Paulson's team identified three vulnerabilities in the subprime bubble: extremely poor underlying loan quality (no-income, no-asset borrowers), excessive leverage, and severe market underestimation of default rates. These three factors together formed the internal logic for the bubble's collapse.
When research-backed conviction is extremely high, concentrate large capital in a single opportunity rather than diversifying and diluting returns
Paulson concentrated most of his fund's assets on the subprime short, an extremely rare level of concentration in hedge funds. This high-conviction concentrated strategy is precisely what enabled him to achieve the astronomical $20 billion return during the crisis.
Paulson's subprime short earned him billions during the financial crisis while millions of Americans lost their homes and jobs. His success contrasted sharply with others' suffering, sparking widespread discussion about the ethics of short-selling.
After the subprime short, Paulson suffered major losses in gold, Greek debt, and other investments. This raised questions: was his success genius or luck? Or do extreme opportunities only appear once, and his system cannot adapt to different market environments?
1978-1994
Learned risk arbitrage and event-driven investing at Odyssey Partners, Bear Stearns, and other institutions
After graduating from Harvard Business School, worked at multiple Wall Street institutions, systematically learning merger arbitrage, risk arbitrage, and other event-driven strategies, accumulating rich practical experience as a foundation for independent entrepreneurship.
1994-2005
Founded Paulson & Co., using merger arbitrage as primary strategy, steadily accumulating assets under management
Founded Paulson & Co. in 1994 with initial assets under management of about $2 million. Primarily using merger arbitrage and event-driven strategies with stable but unremarkable annual returns, gradually building institutional client base, growing assets under management to billions.
2006-2009
Deeply researched subprime market, built the largest short position in history, earned $20 billion during the financial crisis
Began deeply researching the subprime mortgage market in 2006, discovering systematic mispricing. Began large-scale CDS purchases in 2007; when the 2008 financial crisis erupted, the fund earned approximately $20 billion and Paulson personally earned about $4 billion, becoming a Wall Street legend.
2010-present
Suffered major losses in gold, healthcare, and other areas; converted to family office in 2020
After the subprime short, Paulson suffered major setbacks in gold (2011-2013 significant losses), Greek debt restructuring, and other investments, with assets under management shrinking significantly from the peak of $36 billion. In 2020, converted Paulson & Co. to a family office, no longer managing external funds.
Context: After graduating from New York University with a bachelor's degree, entered Harvard Business School for MBA, systematically studying finance and investment theory
Decision: Chose Harvard Business School rather than going directly to Wall Street, systematically building theoretical foundation
Reasoning: Top business school networks and systematic training are crucial for long-term career development
Outcome: Harvard MBA laid the foundation for his subsequent career development at top Wall Street institutions
Lesson: Systematic theoretical training and elite networks are important tickets to entering the elite finance world
Context: After accumulating sufficient experience at Bear Stearns and other institutions, founded an independent hedge fund with $2 million in assets
Decision: Use merger arbitrage as core strategy, focusing on event-driven opportunities with controllable risk and predictable returns
Reasoning: Event-driven investing has clear return sources (event completion vs. non-completion), more predictable than pure directional investing
Outcome: Company grew steadily from $2 million to billions in assets under management
Lesson: Building deep expertise in a specific strategy is the core competency of a hedge fund
Context: While analyzing the US real estate market, Paulson and his team discovered that the underlying asset quality of subprime mortgage securities was extremely poor, but market pricing assumed extremely low default rates
Decision: Began systematically purchasing subprime CDS to build a large-scale short position
Reasoning: There was a huge gap between underlying loan quality (no-income, no-asset borrowers) and market pricing (AAA ratings), a classic characteristic of systematic mispricing
Outcome: Built the largest subprime short position in Wall Street history, laying the foundation for the astronomical returns in 2008
Lesson: When there is a huge gap between fundamental analysis and market pricing, that is the greatest investment opportunity
Context: In early 2007, early stress signals appeared in the subprime market, and Paulson's CDS positions began rapidly appreciating
Decision: Maintained positions, even continuing to add in some periods, rather than taking profits early
Reasoning: Fundamental analysis showed the subprime crisis was far from over; taking profits too early would miss most of the return
Outcome: Fund returned over 590% in 2007, far exceeding market expectations, becoming one of the highest single-year returns in hedge fund history
Lesson: When research-backed conviction is strong enough, holding positions until the thesis fully plays out captures maximum returns
Context: Lehman Brothers collapsed, the financial crisis fully erupted, and Paulson's CDS positions skyrocketed to astronomical values
Decision: Gradually closed positions during the crisis peak, converting paper gains into actual returns
Reasoning: Liquidity decreases during market panic; orderly position closing is needed to realize maximum returns
Outcome: Combined gains of approximately $20 billion over 2007-2008, with Paulson personally earning about $4 billion, called the greatest trade in history
Lesson: Asymmetric return structure + high-conviction concentrated positions backed by deep research is the key combination for creating extraordinary returns
Context: After the subprime short, Paulson bet large capital on gold, believing quantitative easing would lead to inflation
Decision: Established a gold fund, investing large amounts of personal wealth and client funds in gold-related assets
Reasoning: The scale of quantitative easing was unprecedented and would inevitably cause inflation; gold is the best hedge
Outcome: Gold fell sharply after reaching historical highs in 2011; Paulson's gold fund suffered severe losses in 2011-2013
Lesson: Even the most successful investors can make major misjudgments in different market environments
Context: After years of poor performance, external funds withdrew massively, with assets under management shrinking from peak $36 billion to about $9 billion (primarily own funds)
Decision: Proactively converted company to family office, focusing on managing personal wealth without external investor pressure
Reasoning: Family office model allows him to focus on the most confident opportunities without dealing with external investors' short-term performance pressure
Outcome: Company completed transformation; Paulson primarily manages personal wealth and is no longer a public hedge fund manager
Lesson: Identify your optimal competitive environment and deploy talent on the right stage
Context: Wall Street Journal journalist Gregory Zuckerman published a book documenting Paulson's subprime short in full after in-depth interviews
Decision: Paulson agreed to be interviewed, allowing the full picture of this trade to be publicly documented
Reasoning: The strategy and thought process of this trade is worth documenting, helping the investment community understand the essence of event-driven investing
Outcome: Book became an investment classic, allowing Paulson's investment methodology to be understood by a broader audience
Lesson: Transparently documenting successful decision-making processes can provide enormous educational value to the industry
Paulson has mentioned the LTCM failure case as a counterexample of excessive leverage in multiple interviews. This book documents the collapse of Long-Term Capital Management, with important influence on Paulson's strategy choice of using limited-cost CDS (rather than high-leverage shorting) in the subprime trade. Source: Bloomberg interview, 2010.
Paulson deeply studied Graham and Dodd's classic work during his Harvard Business School years; his deep fundamental analysis method was strongly influenced by the value investing tradition. Paulson has mentioned this book's influence on his investment methodology in multiple speeches. Source: Harvard Business School alumni speech, 2011.
Written by Wall Street Journal journalist Gregory Zuckerman after in-depth interviews with Paulson and his team members, documenting the full decision-making process of the subprime short trade. Paulson participated in interviews and is the book's most important primary source.
Michael Lewis's The Big Short documents short-sellers in the 2008 financial crisis from multiple perspectives; Paulson as the largest short-seller is prominently featured. Listed in sources_index as an important reference for understanding the full picture of the subprime crisis.
Burry discovered the subprime bubble before Paulson; their research paths mutually confirmed each other, but Paulson's scale far exceeded Burry's
Boesky was the most famous risk arbitrageur of the 1980s; his strategies and methods had important influence on Paulson's early career development (though Boesky was later prosecuted for insider trading)
Paulson's subprime short made the entire hedge fund industry aware of the enormous potential of CDS as an asymmetric short instrument, promoting the popularization of credit derivative strategies
Both independently discovered the subprime bubble and used similar CDS short strategies, co-protagonists of this historic trade
John Paulson pulled off the greatest trade in the history of Wall Street. He made more money in a shorter period of time than anyone in the history of financial markets.
