For most investors, Warren Buffett remains the gold standard. Over six decades running Berkshire Hathaway (NYSE:BRK-A | BRK-A Price Prediction)(NYSE:BRK-B), Buffett generated average annual returns of roughly 20%. That may not sound extraordinary until you remember the S&P 500 returned about half that rate over the same period. A dollar invested with Buffett in the 1960s became a fortune.
Yet Buffett isn’t the highest-returning investor ever. Peter Lynch, Stanley Druckenmiller, and several other legendary money managers posted superior annual returns. The catch is they did so over much shorter periods. Maintaining market-beating performance for 10, 20, or even 30 years is difficult. Doing it for 60 years is something else entirely.
That’s why Jim Simons belongs in the same conversation.
The Numbers Behind the Greatest Fund in History
According to Renaissance Technologies and industry data compiled over decades, the Medallion Fund has generated a staggering 39.9% compound annual growth rate since its March 1988 launch after fees. Before fees, returns climb to 66.1% annually.
Those figures become even more remarkable when investors consider Medallion’s fee structure:
| Metric | Medallion Fund |
| Management Fee | 5% |
| Performance Fee | 44% |
| Net CAGR Since 1988 | 39.9% |
| Gross CAGR Since 1988 | 66.1% |
Most hedge funds struggle to justify a standard 2% management fee and 20% performance fee. Medallion charged more than double those rates and still delivered returns that no traditional fund has matched.
Even more impressive, the fund has gone nearly four decades without a single losing year.
The Secret Is That the Strategy Was Built to Change
Skeptics might assume Medallion’s success depended entirely on Simons himself. Yet the data says otherwise.
Before Simons stepped away from day-to-day management in 2010, Medallion generated approximately 38.5% annual net returns and 62% annual gross returns. After his departure, net returns remained around 39% annually while gross returns increased into the 75% to 80% range.
Simons stepped down as chairman in 2021 and later passed away. The machine kept running. The reason is surprisingly simple: Renaissance’s strategy was designed to evolve.
Current CEO Peter Brown has preserved the structural foundation Simons created:
- The firm still recruits mathematicians, physicists, astrophysicists, and computer scientists instead of Wall Street veterans.
- Every researcher contributes to a single, interconnected code base.
- Decisions remain entirely systematic, prioritizing risk control and variance management over human intuition.
What changes are the algorithms themselves. As meme-stock trading, social media-driven volatility, and political headline risk altered market behavior, Renaissance adapted. As traditional quantitative signals became crowded, the firm expanded into alternative data, machine learning models, text analysis, and other sophisticated datasets.
In short, the strategy hasn’t survived because it stayed the same. It survived because it was built to continuously reinvent itself.
Investors Can Still Learn From Medallion’s Playbook
Although ordinary investors cannot buy Medallion directly, they can still follow Renaissance’s public holdings through SEC 13F filings.
The results have often been remarkable. For example, Simons first bought Nvidia (NASDAQ:NVDA) in the first quarter of 2011. The stock has gained roughly 54,000%, factoring in stock splits, since then. Renaissance also initiated a position in Micron Technology (NASDAQ:MU) during the third quarter of 2013, a stock that has risen approximately 6,000% since. Today, Palantir Technologies (NYSE:PLTR) ranks among the firm’s largest reported holdings.
Granted, Medallion isn’t a buy-and-hold fund. Renaissance frequently trades around positions as its models change. In the fourth quarter of 2025, for example, it slashed its Nvidia stake by 84.5%. Yet in the first quarter of 2026, the firm reversed course and increased its Nvidia position by 190%, adding approximately 1.66 million shares.
That’s the difference between a quantitative trading system and a long-term investor. Renaissance is optimizing for statistical probabilities, not necessarily maximizing multi-decade ownership.
For many retail investors, the smarter approach may be simpler: identify the high-conviction companies Renaissance consistently gravitates toward and hold them through the volatility.
Key Takeaway
Buffett remains one of history’s greatest investors because he compounded wealth at roughly 20% annually for 60 years. Yet Jim Simons’ Medallion Fund produced nearly 40% annual returns over almost four decades while surviving changing markets, technological revolutions, and even Simons’ departure.
That track record suggests the real genius wasn’t a single algorithm. It was the system Simons built. The fund’s scientific culture, relentless adaptation, and disciplined risk management remain intact under Brown.
Investors can’t buy Medallion itself. But they can study its holdings, learn from its process, and potentially benefit from the same long-term winners the firm’s models continue to identify. Ultimately, that’s about as close as most investors will ever get to owning a piece of the greatest hedge fund ever created.