Jim Simons is the most successful quantitative trader in financial history. His Medallion Fund at Renaissance Technologies produced 35.6 percent annual returns from inception in March 1988 through 1999 — a cumulative gain of 2,478.6 percent that outran every other offshore fund tracked over that period, including the Quantum Fund of George Soros. He built that record without hiring a single Wall Street veteran, without a finance department, and without ever predicting where markets would go. He hired mathematicians, astrophysicists, and computational linguists, and let the models do the work.
Renaissance Technologies: What It Is
From Renaissance Technologies:
Renaissance Technologies is a private investment management company with over $4,000,000,000 under management founded in 1982 by Jim Simons, who (correctly) believed in the potential of technical trading models
That parenthetical — “(correctly)” — is doing more work than it appears. In 1982, the idea that technical trading models could beat discretionary managers over long periods was not conventional wisdom. It was a contrarian thesis. Simons bet his career on it. The Medallion Fund’s returns are the answer to anyone who still doubts the premise.
Science Over Finance: Simons on What Matters
Jim Simons had this to say about science and trading:
The advantage scientists bring into the game is less their mathematical or computational skills than their ability to think scientifically. They are less likely to accept an apparent winning strategy that might be a mere statistical fluke.
This is one of the most important statements in the entire literature on systematic trading. The failure mode Simons identifies — accepting a strategy that is a statistical fluke — is the failure mode that destroys most quantitative funds. A system that worked for three years in a specific market environment is not necessarily a system. It may be a coincidence. Scientists, trained to distinguish signal from noise and to demand reproducible evidence before drawing conclusions, are harder to fool by spurious patterns than traders trained to trust their instincts and act on recent performance.
The TurtleTrader rules were developed with the same intellectual discipline. Richard Dennis and William Eckhardt tested their trading principles before teaching them. The rules were not assembled from intuition — they were derived from systematic observation of how markets behave over time. Simons took that methodology further, applying the full rigour of academic science to the problem. The scale differs. The underlying commitment to evidence over opinion is identical.
The Euromoney Profile: The Numbers That Changed Everything
Euromoney Institutional Investor PLC:
Chances are you haven’t heard of Jim Simons, which is just fine by him. Nor are you alone. Many on Wall Street, including competitors in his specialty, quantitative trading, haven’t heard of Simons or of his operation, Renaissance Technologies Corp., either. And that’s simply extraordinary–because, gross or net, Simons may very well be the best money manager on earth. An extreme judgment? Perhaps. Certainly, there has been no end of claimants to the title. And one after another, over the past few years, these celebrated managers have either blown up or folded their tents. After big reverses, Julian Robertson closed down Tiger Management, and George Soros scaled back the activities of his Quantum Fund this year. John Meriwether’s Long-Term Capital Management neatly took down the financial world in 1998.
Simons, by contrast, just keeps getting better. Consider his performance over the past decade. Since its inception in March 1988, Simons’ flagship $ 3.3 billion Medallion fund, has amassed annual returns of 35.6 percent, compared with 17.9 percent for the Standard & Poor’s 500 index. For the 11 full years ended December 1999, Medallion’s cumulative returns are an eye-popping 2,478.6 percent (see graph, page 47). Among all offshore funds over that same period, according to the database run by veteran hedge fund observer Antoine Bernheim, the next-best performer was Soros’ Quantum Fund, with a 1,710.1 percent return. Simons is No. 1, says Bernheim. Ahead of George Soros. Ahead of Mark Kingdon. Ahead of Bruce Kovner. Ahead of Monroe Trout.
Jim Simons is without question one of the really brilliant people working in this business, says quantitative trading star David Shaw, chairman of D.E. Shaw, which boasts returns above 50 percent this year. He is a first-rate scholar, with a genuinely scientific approach to trading. There are very few people like him. Simons surrounds himself with like minds. The headquarters of Renaissance, in the quaint town of East Setauket on New York’s Long Island, resembles nothing so much as a high-powered think tank or graduate school in math and science. Operating out of a one-story wood-and-glass compound near SUNY Stony Brook, Renaissance, founded in 1982, has 140 employees, one third of whom hold Ph.D.s in hard sciences. Many have studied or taught in Stony Brook’s math department, which Simons chaired from 1968 to 1976. Among their ranks: practitioners in the fields of astrophysics, number theory, computer science and computational linguistics. In notably short supply are finance types. Just two employees, including the head of trading, are Wall Street veterans.
I have one guy who has a Ph.D. in finance. We don’t hire people from business schools. We don’t hire people from Wall Street, says Simons. We hire people who have done good science. The atmosphere is college casual, if intense–think of a perpetual exam week. Though a natty dresser, Simons sets a properly idiosyncratic tone. He has been known to show up at formal business meetings without socks, says Jerome Swartz, Simons’ next-door neighbor on Long Island. Job candidates don’t have to know any finance–in fact, Wall Street experience is a black mark–but they must present a talk on their scientific research to the entire firm before being offered a job.
Most staffers seem to know little about the rest of the financial services industry, or even the hedge fund business. Asked about the performance of legendary futures trader and Renaissance rival Paul Tudor Jones, one researcher says, Who’s Tudor Jones?
Why Wall Street Experience Is a Black Mark
The hiring policy at Renaissance is the most radical thing about the firm. Finance knowledge is not neutral — it is a disqualifier. Simons understood that people trained in conventional finance bring with them a set of assumptions about how markets work, what is tradeable, and what constitutes a valid strategy. Those assumptions are not uniformly wrong, but they narrow the search space. A physicist or a linguist arrives without those constraints and can find patterns that a trained analyst would dismiss before investigating.
This connects to one of the core arguments behind the TurtleTrader experiment. Dennis and Eckhardt did not want experienced traders. They wanted people who could learn a system and follow it without the interference of prior beliefs about what should work. The Turtles who came from non-finance backgrounds — a game designer, a pianist, a philosophy student — were not at a disadvantage. They were, in some ways, better equipped to follow rules without second-guessing them. Simons took that principle to its logical extreme: he built a firm where the absence of financial training was a prerequisite for employment.
The Medallion Fund in Context
The numbers from the Euromoney profile deserve a moment of reflection. Medallion returned 2,478.6 percent over eleven years. The next-best fund in the same database — the Soros Quantum Fund — returned 1,710.1 percent. These are not similar numbers. Medallion beat the second-best performer by close to 800 percentage points over the same period, while running far more capital and maintaining full liquidity. The S&P 500 returned 17.9 percent annually over that stretch. Medallion returned 35.6 percent. The gap between those two numbers, compounded over eleven years, is the distance between ordinary and extraordinary.
What made it possible was not genius in the conventional sense. It was the application of scientific method — forming hypotheses, testing them, rejecting the ones that did not hold up, and trading only on the ones that did. That process, applied at scale with genuine intellectual rigour, produced the best track record in the history of institutional investing. The lesson is not that everyone can replicate Renaissance. The lesson is that systematic, evidence-based trading beats discretionary trading over long periods, and that the edge compounds when you remove human opinion from the execution process.
Frequently Asked Questions About Jim Simons
Who is Jim Simons?
Jim Simons is a mathematician and former academic who founded Renaissance Technologies in 1982. He ran the Medallion Fund to 35.6 percent annual returns from 1988 to 1999, producing cumulative returns of 2,478.6 percent — the best record of any offshore fund tracked over that period. He chaired the mathematics department at Stony Brook University before turning to trading full time.
What is the Medallion Fund?
The Medallion Fund is the flagship fund of Renaissance Technologies. It has produced some of the highest risk-adjusted returns in hedge fund history, running above 35 percent annually for over a decade. The fund is closed to outside investors — it is managed exclusively for Renaissance employees. Its performance is the benchmark against which every other quantitative fund measures itself.
Why doesn’t Renaissance hire Wall Street professionals?
Simons concluded that finance training introduces assumptions and mental frameworks that limit the search for profitable patterns. Scientists trained in fields like astrophysics, linguistics, or number theory approach data without those constraints. They are also less prone to accepting strategies that look good on recent data but lack statistical robustness. Renaissance’s staff are required to present their scientific research before being hired — the content does not need to relate to finance at all.
How does Simons connect to trend following?
Simons and the trend following world share a foundational commitment: let models and evidence drive decisions, not human opinion. The TurtleTrader rules were built on the same premise — test a system, trust the results, and follow the signals without override. Renaissance applies that logic at far greater scale and mathematical sophistication, but the core principle is the same. Price-based signals, tested with rigour, applied with discipline, beat discretionary judgment over time.
Trend Following Systems
Want to learn more and start trading trend following systems? Start here.
