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John Paulson and "the greatest trade ever," explained

In 2007, as the US housing market cracked, a little-known merger specialist named John Paulson saw his firm earn about $15 billion for its funds in a single year. A book later called it "the greatest trade ever." What came after is just as worth knowing.

Story · 7-minute read · Updated 2026-10-21

Who they were

John Paulson was born in Queens, New York, in 1955. He studied at New York University and earned an MBA from Harvard in 1980.

He worked at a consulting firm and then on Wall Street, including in mergers at Bear Stearns. In 1994 he started his own firm, Paulson & Co., with a small amount of money.

For years, Paulson & Co. was known for merger arbitrage: careful bets on whether announced company takeovers would go through. It was a quiet, low-drama business. Few people outside Wall Street knew his name.

What happened

Seeing the problem

By 2005 and 2006, Paulson and his team had become worried about the US housing market. Prices had risen fast. Lenders were giving loans to borrowers who might not be able to repay them, often with low starting payments that would later jump.

His team dug into the data on home prices and loan quality. They concluded that if prices simply stopped rising, many risky loans would fail.

The bet

Paulson's funds bought credit default swaps on bonds made of risky home loans. These work like insurance:

• His funds paid regular fees, like premiums.
• If the loans kept paying, those fees were lost.
• If the loans failed, the swaps would pay out many times the cost.

It was a lopsided bet. The cost of being wrong was the premiums. The payoff of being right was huge.

The wait

At first, the trade cost money. House prices and stocks kept rising for a while. According to Gregory Zuckerman's book The Greatest Trade Ever (2009), Paulson and others lost money in the early months and faced doubts. Paulson added to the position anyway.

2007

In 2007, home loans began failing in large numbers. Bonds made from them crashed in value. The insurance Paulson held soared.

Zuckerman reported that Paulson & Co. earned more than $15 billion for its funds in 2007, and that Paulson's personal share was about $4 billion. Those are figures from the book and press at the time, not audited public numbers.

A legal footnote

In 2010, the SEC charged Goldman Sachs over a mortgage deal called Abacus that Paulson's firm had bet against. The SEC said Goldman hadn't told other investors about Paulson's role in choosing the loans inside it. Goldman settled in July 2010 for $550 million. Paulson and his firm were not charged.

After the big trade

Paulson made more large bets in the years after, including on gold and on a US recovery. Some worked for a time. In 2011, his Advantage Plus fund lost roughly half its value, according to widely reported figures. In 2020, Paulson & Co. returned outside investors' money and became a family office, managing mainly his own money.

The moment everyone remembers

The moment is 2007: a quiet merger specialist making one of the largest single-year gains in Wall Street history.

But many people who study Paulson point to the years after. The man who made the greatest trade ever then had some very bad years. The skill that found one rare, lopsided setup didn't turn into a skill for winning every year.

What it teaches

1. Know the most you can lose

Paulson's bet had a clear maximum loss: the premiums. Before entering, you knew the worst case. That's the core idea of a stop loss: decide your cost of being wrong before you start.

2. Look for lopsided trades

Small cost, big possible gain. That shape is what risk-reward ratio measures. The risk-reward calculator shows it for any trade. A math idea, not a promise: lopsided trades still lose often.

3. One big win can be dangerous

After a huge success, it's natural to feel you've cracked it. Paulson's later losses show how hard it is to repeat a rare setup. Our guide to overconfidence in trading covers the warning signs, like trading bigger after a winning streak.

4. Keep your size steady

Whether you just won or just lost, the risk per trade stays the same, about 1%. That's what keeps one great trade, or one bad one, from changing everything. The position size calculator keeps it consistent.

What it doesn't mean

It doesn't mean bets against the market are smart. Many investors bought similar insurance too early, or on the wrong bonds, and lost money. We remember the ones whose timing worked.

It doesn't mean Paulson's skill was luck, or that it was pure genius. His team did deep research. But the trade also needed a rare event, the worst US housing crash in generations, to happen within a time frame his funds could survive.

And you can't copy it. Those swaps were sold to big institutions, not the public. What carries over is the structure: a known worst case, a lopsided payoff, and steady size whatever just happened.

Timeline

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