The Most Successful Trader In History

If you ask a casual investor who the greatest trader of all time is, they’ll probably point to Warren Buffett. They’ll talk about compounding, value investing, and holding Coca-Cola for forty years. Buffett is a legend, no doubt. But if we’re talking about pure, unadulterated performance—the kind of returns that make your eyes water—Buffett doesn’t even come close. Neither does George Soros or Steve Cohen. The Most Successful Trader In History

The title belongs to a man who didn’t even start trading until he was nearly forty. His name was Jim Simons.

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Simons wasn’t a “finance guy.” He was a mathematician. A world-class one. Before he ever looked at a stock chart, he was busy winning the Oswald Veblen Prize in Geometry and cracking codes for the National Security Agency during the Cold War. When he finally turned his attention to the markets in 1978, he didn’t bring a copy of The Intelligent Investor with him. He brought a phalanx of physicists, astronomers, and string theorists. The Most Successful Trader In History

The result was the Medallion Fund, managed by his firm, Renaissance Technologies. The numbers are frankly absurd. From 1988 to 2018, the fund generated average annual returns of 66% before fees. Even after Renaissance took their massive cut—a 5% management fee and 44% of the profits—investors still walked away with 39% a year. To put that in perspective, $1,000 invested in the Medallion Fund in 1988 would have grown to roughly $27,000,000 by 2018. Buffett’s Berkshire Hathaway, over that same period, wouldn’t have even hit $100,000.

Simons didn’t care about “value.” He didn’t care about a company’s CEO or its five-year growth plan. In fact, he famously avoided hiring anyone with a Wall Street background. He thought they were biased by traditional, often wrong, economic theories. Instead, he hired people who knew how to find signal in noise.

They looked for patterns that shouldn’t exist. They found that certain commodities tended to trade at a specific price on Tuesday mornings but flipped by Friday afternoons. They realized that weather patterns in Paris might subtly influence wheat futures in Chicago. These weren’t massive, fundamental shifts. They were tiny, fleeting inefficiencies—statistical ghosts in the machine. The Most Successful Trader In History

Renaissance didn’t try to be right every time. They just needed to be right 51% of the time. If you do that a million times a day with enough leverage, you’re not gambling anymore. You’re the house.

It’s a mistake to think this was easy money. The early years of Renaissance were a mess. Simons tried to trade like everyone else at first, using his gut and some basic models. He almost went bust. It wasn’t until he leaned entirely into the “black box” approach—letting the algorithms make the calls without human interference—that the magic started. There’s a story that during a market dip, one of his top scientists wanted to override the system to stop the bleeding. Simons refused. He trusted the math more than he trusted his own fear.

That’s what sets him apart. Most traders, even the greats, eventually fall victim to their own ego or emotions. They stay at the party too long. They fall in love with a “sure thing.” Simons removed the human element entirely. He realized that the market isn’t a rational place governed by logic; it’s a massive, chaotic data set.

He also knew when to stop. The Medallion Fund has been closed to outside investors since 1993. It’s essentially a private money-printing press for Renaissance employees. They realized that if the fund got too big, their trades would start moving the market themselves, destroying the very patterns they were trying to exploit.

Jim Simons passed away in May 2024. He left behind a fortune of over $30 billion, most of which he gave away to scientific research and math education. He didn’t just beat the market; he solved it. He proved that in a world of suits and intuition, the guy with the chalkboard and the better algorithm wins every single time.

We can talk about “market wizards” all we want, but Simons was the only one who actually found the formula. The rest are just guessing.