The greatest traders in history and the lessons they left

Jesse Livermore: the trader who wrote the rules, then broke them

Jesse Livermore was born in 1877 and talked his way into a job posting quotes at a Boston brokerage office at 14. He became the model for Reminiscences of a Stock Operator, Edwin Lefèvre’s 1923 book that traders still read a century later. His famous trade came in 1929, when he sold stocks short ahead of and during the crash. Biographies widely report that he made about $100 million, a figure that comes from later accounts rather than any audited statement, so treat it as an estimate.

The part of the story that matters more is the ending. By 1934 the fortune was gone and Livermore had declared bankruptcy again. He died by suicide in 1940. The man who taught generations of traders to cut losses and never average down broke his own rules when it mattered most. The lesson: a rule you do not follow is not a rule. Written exits and size limits only protect you if the process enforces them when your confidence is highest.

Modern tooling can carry some of that enforcement. In Aeris, for example, stops and targets attach to the order when you trade from the chart, and the flatten button and kill switch exist for the moment discipline fails. A tool cannot supply the rule, but it can make the rule easier to keep.

George Soros and Stanley Druckenmiller: the pound, 1992

Britain had joined Europe’s Exchange Rate Mechanism in 1990 and was struggling to keep sterling inside its band. Quantum Fund, run by George Soros with Stanley Druckenmiller as chief portfolio manager, led a field of speculators betting the peg would break. Druckenmiller had held a $1.5 billion short position in the pound since August 1992, and when Germany’s Bundesbank president suggested a realignment was needed, he judged devaluation inevitable. Soros’s response, in Sebastian Mallaby’s account, was to tell him to go for the jugular: when the research says you are right and the moment has arrived, size is part of the edge.

The fund’s profit across the episode is widely reported at about $1 billion; Soros himself later recalled it as about £1 billion. Popular retellings put the position at $10 billion or more, which goes beyond the documented account, and the profit accrued over weeks, not in a single day. The lesson: conviction positions are built before the crowd arrives, sized to the evidence, and survived if wrong. The day itself, September 16, 1992, known as Black Wednesday, went like this:

• The Bank of England bought sterling at a rate of about £2 billion an hour by mid-morning.
• Interest rates went from 10 to 12 percent that morning, with a further rise to 15 percent announced before the day was out.
• By evening, Britain had suspended its ERM membership, and the pound fell.

Paul Tudor Jones: positioned for the 1987 crash

In the months before October 1987, Paul Tudor Jones studied the parallels between that year’s market and the run-up to 1929, and positioned his Tudor fund against the market. When the Dow Jones Industrial Average fell 22.6 percent on October 19, 1987, still the largest one-day percentage decline in its history, his short positions made him an estimated $100 million, a figure repeated across profiles rather than audited. He had also let a PBS crew film him at work that year, and the resulting documentary, Trader, became one of the few records of a famous call made before the fact.

The lesson is not that crashes can be predicted on schedule. It is that preparation and asymmetric positioning pay occasionally and cost little when wrong. Jones was positioned for a crash that could have come years later or not at all. One famous year is also not a career: the same profiles note that his edge came from defending capital first, a theme that runs through the guide for new futures traders.

Richard Dennis and the Turtle experiment

By the early 1980s, Chicago futures trader Richard Dennis had reportedly turned a stake of less than $5,000 into more than $100 million. He and his partner William Eckhardt disagreed about whether great trading could be taught. Dennis settled the argument with an experiment: he placed an ad in the Wall Street Journal, drew thousands of applicants, and trained a first class of 14 people for two weeks. He called them his turtles, after turtle farms he had seen in Singapore, because he believed he could grow traders the same way.

The two Turtle classes reportedly earned more than $175 million over five years. That figure comes from participants and later books, not an audit, and the same system produced deep drawdowns. Popular versions of the Dennis story inflate his personal stake into claims like $1,600 becoming $200 million, which exceeds what the record supports. The lesson: rules can be taught in two weeks; following them through a 30 percent drawdown is the part that cannot. The rules themselves were mechanical trend following:

• Buy breakouts to new highs, and sell breakdowns to new lows.
• Size each position from market volatility, not from conviction.
• Risk no more than about 2 percent of the account on one trade.
• Know the exit before the entry.

Ed Seykota: the first computerized trend follower

In the early 1970s, while most traders still read ticker tape, Ed Seykota was testing trend-following rules on punch-card computers. His interview in Jack Schwager’s 1989 book Market Wizards made him the archetype of the systems trader. In that interview he described growing one client account from $5,000 to a reported $15 million over about twelve years. The figure comes from his own telling and cannot be independently audited, but the method is documented: test the idea, size the bet from volatility, cut losers, let winners run, and follow the system whether or not you agree with it today.

Seykota’s oft-quoted summary of good trading is to ride winners, cut losses, and manage risk. The lesson: his edge was never prediction. It was the discipline to let a simple, tested process make thousands of small decisions without interference.

Jim Simons and the Medallion Fund

Jim Simons was a mathematician who founded the firm that became Renaissance Technologies in 1982 and staffed it with scientists rather than traders. Its Medallion Fund is the most extreme documented record in markets: according to Gregory Zuckerman’s 2019 book The Man Who Solved the Market, Medallion averaged about 66 percent annually before fees from 1988 through 2018 and never had a losing gross year in 31 years. Even finance professors who studied the numbers describe them as nearly inexplicable.

Two cautions apply. The figures come from a journalist’s book, and the fund has been closed to outside money for decades, so nobody outside can verify or access them. And Medallion is one fund out of tens of thousands: it is the extreme tail of the distribution, not evidence that such returns are available to anyone with a model. The lesson: the greatest recorded run in market history came from statistics, data, and infrastructure applied to thousands of small edges, not from heroic single trades.

Nick Leeson and the fall of Barings Bank

Barings was Britain’s oldest merchant bank, founded in 1762. Nick Leeson was a 28-year-old in its Singapore office with an unusual flaw in the org chart: he ran both the trading desk and the back office that was supposed to check it. From 1992 he hid losses in a secret ledger numbered 88888 while reporting profits to London. By December 1994 the hidden account held losses of 373.9 million Singapore dollars.

Leeson’s response was to double down, betting that the Nikkei would hold above 19,000. The Kobe earthquake in January 1995 sent the index down instead, the losses grew past the bank’s capital, and Barings collapsed on February 27, 1995, roughly £830 million in the hole. It was sold to ING for £1. The lesson is older than electronic markets: a loss you hide or average into does not get smaller. Cut it while it is still a number, not a catastrophe, and never let one person mark their own homework.