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Legendary Trades
Paulson's Big Short
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For educational purposes only. Not financial advice. Higher returns come with higher risk. Never risk more than you can afford to lose.
Trading StatementREF: TS-2026-03
Trading StatementFor educational purposes only. Not financial advice. Higher returns come with higher risk. Never risk more than you can afford to lose.
John Alfred Paulson was born in 1955 in Queens, New York, the son of an accountant. He attended New York University's Stern School of Business, where he graduated first in his class, and later earned an MBA from Harvard Business School as a Baker Scholar, the highest academic distinction the school awards. After Harvard, Paulson worked at Boston Consulting Group and then at Bear Stearns in the mergers and acquisitions department, where he developed his expertise in event-driven investing. In 1994, he founded Paulson and Co with two million dollars of his own money, operating out of a small office in midtown Manhattan with a single assistant.
For the first decade of its existence, Paulson and Co was a competent but unremarkable hedge fund specializing in merger arbitrage — the practice of buying shares of companies being acquired and profiting from the spread between the market price and the deal price. The fund managed around one to two billion dollars in assets and generated steady but unspectacular returns. Paulson was respected within the merger arbitrage community but was virtually unknown outside it. He had no background in macroeconomic trading, no expertise in housing markets, and no experience with the complex structured credit instruments that would become central to the greatest trade of his career. Nothing in his resume suggested he would produce the largest single-year profit in hedge fund history.
The American housing market in the mid-2000s was in the grip of a mania that few recognized at the time. Home prices had risen continuously since the mid-1990s, accelerating sharply after 2002 as the Federal Reserve held interest rates at historically low levels. The mortgage industry had been transformed by securitization — the practice of bundling thousands of individual mortgages into bonds that could be sold to investors worldwide. This system divorced the origination of mortgages from the bearing of their risk, creating perverse incentives for mortgage lenders to make increasingly reckless loans. By 2005 and 2006, subprime mortgages — loans to borrowers with poor credit histories, often with no income verification and teaser rates that would reset dramatically higher — accounted for roughly 20 percent of all new mortgage originations.
The intellectual genesis of Paulson's trade came from Paolo Pellegrini, a former colleague whom Paulson hired in 2005. Pellegrini, an Italian-born Harvard MBA who had experienced a series of career setbacks, was given the task of analyzing the US housing market. Working from a cluttered desk with spreadsheets and public data, Pellegrini constructed a model that compared home prices to their long-term trend relative to household incomes and rental prices. His analysis was stark: US home prices had deviated from their historical trend by an unprecedented margin. If prices merely reverted to the long-term average — not even overcorrecting, just returning to normal — the decline would be catastrophic for the trillions of dollars in mortgage-backed securities that had been issued based on the assumption that housing prices only go up.
The key insight was not just that housing was overvalued, but that the losses would be concentrated in a specific segment: subprime mortgage bonds. These bonds were structured in tranches, with the lowest-rated tranches absorbing the first losses. The ratings agencies — Moody's, Standard and Poor's, and Fitch — had assigned investment-grade ratings to the vast majority of these securities, including the infamous triple-A ratings on senior tranches that were backed by pools of subprime loans to borrowers with FICO scores below 620. Pellegrini and Paulson concluded that even a modest increase in default rates would wipe out the lower tranches entirely, and that a serious housing downturn could impair even senior tranches that the market considered essentially risk-free.
The mechanism for expressing this bet was the credit default swap, or CDS. A credit default swap is essentially an insurance contract on a bond: the buyer pays a regular premium to the seller, and in return, the seller agrees to compensate the buyer if the bond defaults or suffers credit losses. Crucially, you did not need to own the underlying bond to buy a CDS on it — a feature that allowed Paulson to create what was effectively a massive short position on the subprime mortgage market. The cost of this insurance was remarkably cheap because the market consensus was that a nationwide housing decline was essentially impossible. Premiums on CDS for subprime mortgage bonds were running at roughly one to two percent per year, meaning Paulson's maximum annual loss was the premium paid, while the potential gain if the bonds defaulted was a multiple of that premium. It was the very definition of an asymmetric trade.
In 2006, Paulson launched two new funds dedicated specifically to the subprime short trade: the Paulson Credit Opportunities Fund and the Paulson Credit Opportunities Fund II. Raising capital was extremely difficult. Most institutional investors thought Paulson was out of his depth — a merger arbitrage specialist with no macro experience making an enormous bet against the housing market. Many potential investors noted that home prices had never declined on a national basis in the post-war era and concluded that Paulson's thesis was fundamentally flawed. He held dozens of meetings with pension funds, endowments, and fund-of-funds, and most of them passed. The funds launched with relatively modest capital, though they would grow significantly as the trade began to work.
Paulson worked closely with several investment banks to structure his CDS positions. Most notably, Goldman Sachs created the ABACUS program, a series of synthetic collateralized debt obligations that allowed investors to take long or short positions on pools of subprime mortgage bonds. Paulson helped select the specific mortgage bonds that would be referenced in some of these deals, choosing bonds that he believed were most likely to default based on their underlying loan characteristics — high loan-to-value ratios, adjustable rates about to reset, borrowers in overheated housing markets. Goldman Sachs would later pay a 550-million- dollar fine to the SEC for failing to disclose to the buyers of ABACUS that the referenced portfolio had been selected by a short seller with an interest in seeing them fail.
The first half of 2007 was a period of mounting tension. Subprime defaults began rising sharply as teaser rates reset on 2005 and 2006 vintage mortgages, and home prices started to decline in overheated markets like Las Vegas, Phoenix, and parts of Florida and California. Yet the prices of subprime mortgage bonds were slow to reflect the deteriorating fundamentals, in part because the ratings agencies were reluctant to downgrade them and in part because banks continued to issue new mortgage-backed securities. Paulson's funds were paying premiums on their CDS positions and showing modest losses in the first quarter, testing the conviction of both Paulson and his investors. Some staff members at Paulson and Co privately questioned whether the trade would work.
The dam broke in the summer of 2007. In June, two Bear Stearns hedge funds that were heavily invested in subprime mortgage-backed securities collapsed, sending the first shockwave through Wall Street. In July, the ratings agencies finally began mass downgrades of subprime bonds. The ABX index, which tracked the price of credit default swaps on subprime mortgage bonds, plummeted. Paulson's funds, which held enormous CDS positions, exploded in value. The Credit Opportunities Fund gained 590 percent in 2007. The fund's total profit for the year was approximately 15 billion dollars — the largest single-year gain in hedge fund history, eclipsing the previous record by a wide margin. It was a windfall of historic proportions, generated by a trade that most of the financial establishment had dismissed as foolish.
John Paulson was the principal and the public face of the trade, but Paolo Pellegrini was its intellectual architect. Pellegrini's rigorous quantitative analysis of the housing bubble provided the empirical foundation on which the entire thesis rested. Without Pellegrini's work, Paulson might never have had the conviction to bet so heavily against housing. After the trade paid off, Pellegrini left Paulson and Co to start his own fund, PSQR, though it never achieved comparable success. His contribution to the greatest trade in hedge fund history remains somewhat underappreciated, overshadowed by Paulson's name on the fund's door.
On the sell side, Greg Lippmann at Deutsche Bank played a crucial role in evangelizing the subprime short trade across the hedge fund community. Lippmann, a colorful and aggressive bond trader, had independently reached the conclusion that subprime bonds were dramatically overvalued and spent much of 2006 and 2007 pitching the trade to hedge funds, providing the analytical framework and helping structure CDS positions. His efforts helped create the critical mass of short interest that would accelerate the collapse when it came. Michael Burry, the former neurologist turned hedge fund manager profiled in Michael Lewis's book "The Big Short," independently identified the same opportunity and made a smaller but still enormously profitable bet through his fund Scion Capital, earning roughly 750 million dollars for his investors.
The losers in the trade were some of the most prestigious names on Wall Street. AIG's Financial Products division, which had sold enormous quantities of CDS on subprime bonds without adequate reserves, would eventually require a 182-billion-dollar government bailout. Bear Stearns and Lehman Brothers, both heavily exposed to subprime mortgage securities, would collapse in 2008. Merrill Lynch suffered tens of billions in losses and was forced into a shotgun merger with Bank of America. The buyers on the other side of Paulson's trades were institutional investors — pension funds, insurance companies, European banks — who had trusted the ratings agencies and Wall Street's assurances that subprime mortgage bonds were safe investments. Their losses were staggering and contributed directly to the global financial crisis that followed.
Paulson's trade was not merely profitable for his fund; it was a leading indicator of the most devastating financial crisis since the Great Depression. The subprime mortgage collapse that enriched Paulson destroyed trillions of dollars in wealth worldwide. US home prices fell by approximately 35 percent from their peak, wiping out the equity of millions of homeowners. The stock market, as measured by the S&P 500, fell roughly 57 percent from its October 2007 peak to its March 2009 trough. Unemployment in the United States rose from 4.4 percent in early 2007 to 10 percent by October 2009. The crisis spread globally, triggering recessions in virtually every major economy and sovereign debt crises in several European countries.
The financial industry itself was reshaped. Five of the largest investment banks on Wall Street — Bear Stearns, Lehman Brothers, Merrill Lynch, Goldman Sachs, and Morgan Stanley — either failed, were forcibly merged, or converted to bank holding companies to gain access to Federal Reserve emergency lending facilities. The government intervened with the 700-billion- dollar Troubled Asset Relief Program, direct bailouts of AIG and the auto industry, and unprecedented monetary policy actions including zero interest rates and multiple rounds of quantitative easing. The crisis led to the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, the most comprehensive overhaul of financial regulation since the 1930s.
For the hedge fund industry, Paulson's trade represented both the pinnacle and a turning point. It demonstrated that a relatively small team with deep analytical conviction could generate returns that dwarfed the largest institutions on Wall Street. Paulson personally earned approximately four billion dollars in 2007, making him the highest-paid hedge fund manager that year by a wide margin. His firm's assets under management swelled from roughly six billion dollars before the trade to over 36 billion dollars as investors rushed to allocate to the manager who had called the crisis correctly. The success of the subprime short trade inspired a generation of hedge fund managers to seek similar asymmetric opportunities in other markets and asset classes.
The aftermath for Paulson himself was bittersweet. Having achieved the greatest trade in hedge fund history, he faced the nearly impossible challenge of finding an encore. Paulson made several large subsequent bets, including a profitable investment in gold during the 2008-2011 precious metals rally. However, his subsequent track record was marred by significant losses. A massive concentrated position in the pharmaceutical company Valeant resulted in billions in losses when the company's aggressive pricing practices drew regulatory scrutiny and its stock collapsed. His gold fund lost roughly 50 percent in 2013 alone. By the mid-2010s, Paulson and Co's assets under management had declined sharply as investors withdrew capital, and in 2020, Paulson converted the firm to a family office, returning all outside capital.
The ABACUS deal that Goldman Sachs structured with Paulson's input became the subject of one of the most prominent enforcement actions of the post-crisis era. In 2010, the SEC charged Goldman Sachs with fraud for failing to disclose to ABACUS investors that Paulson had helped select the reference portfolio and was betting against it. Goldman paid 550 million dollars to settle the charges, at the time the largest SEC fine in history. Fabrice Tourre, the Goldman vice president who marketed the deal, was found personally liable for fraud in a 2013 civil trial. Paulson himself was never charged with wrongdoing, as there is nothing illegal about short selling or about expressing a view through CDS positions.
The moral dimension of the trade has been debated ever since. Critics argued that Paulson and other short sellers profited from the misery of millions of homeowners who lost their houses and the broader economic devastation that followed the crisis. Defenders countered that Paulson did not cause the housing bubble — reckless lending, incompetent regulation, and conflicted ratings agencies did — and that short sellers play a valuable role in markets by identifying and correcting mispricings. The truth is nuanced: Paulson identified a real problem that regulators and the financial establishment had ignored, and he was entitled to profit from his analysis. But the scale of human suffering that accompanied his windfall ensures that the trade will always carry a moral complexity that purely financial analysis cannot resolve. Gregory Zuckerman's 2009 book "The Greatest Trade Ever" chronicled the full story and cemented the trade's place in financial history.
The most important lesson from Paulson's trade is the concept of asymmetric risk-reward. The CDS positions that Paulson purchased had a clearly defined maximum loss — the annual premium payments — and a massive potential gain if subprime bonds defaulted. This asymmetry meant that even if the timing was uncertain, the expected value of the trade was overwhelmingly positive. Traders should constantly seek opportunities where the potential gain dramatically exceeds the potential loss, where the cost of being wrong is manageable, and where the payoff from being right is transformative. These opportunities are rare, but when they appear, they deserve significant allocation.
The trade also demonstrates the critical importance of independent analysis. Paulson's thesis was built on original research — Pellegrini's painstaking analysis of housing valuations relative to long-term trends. It was not derived from market consensus, Wall Street research reports, or media narratives. In fact, the consensus was diametrically opposed to Paulson's view: the market, the ratings agencies, the Federal Reserve, and the vast majority of economists all believed that a nationwide housing decline was virtually impossible. Traders who rely on consensus views will, by definition, never be positioned for the most profitable trades, because the most profitable trades arise precisely when the consensus is wrong.
Conviction and the ability to endure pain are essential for large-scale contrarian trades. Paulson spent months paying premiums on his CDS positions while the housing market continued to rise. His investors questioned the thesis. His staff had doubts. Wall Street was openly dismissive. Maintaining a large contrarian position in the face of these pressures requires an unusual combination of intellectual rigor, emotional discipline, and financial resources. Many traders identify the right trade but exit too early because they cannot tolerate the discomfort of being early, which in the markets is often indistinguishable from being wrong. The ability to distinguish between a thesis that is early and one that is simply wrong is perhaps the most important judgment call a trader ever makes.
Finally, Paulson's subsequent career offers a sobering reminder that one great trade does not make a great investor. The skills that enabled the subprime short — deep research into a specific market dislocation, patient accumulation of an asymmetric position, conviction in the face of consensus opposition — did not automatically transfer to other contexts. Several of Paulson's later bets, made with the confidence of a man who had been spectacularly right once, resulted in spectacular losses. The market has a way of humbling those who mistake a single success for universal genius. Consistent risk management, position sizing discipline, and intellectual humility are more important to long-term success than any single trade, no matter how brilliant.