In this article, we discuss the 12 Best Stocks to Invest In According to Jim Simons’ Renaissance Technologies.
Founded in 1982 by mathematician Jim Simons, Renaissance Technologies is widely regarded as the most successful quantitative hedge fund in financial history. Headquartered in East Setauket, New York, the firm pioneered systemic, algorithmic trading, often referred to as quant investing, by completely replacing human economic intuition with mathematical models. Renaissance operates by analyzing huge datasets to identify microscopic, highly predictable anomalies in global markets. To build these proprietary computer systems, the firm famously avoids hiring traditional Wall Street MBAs or finance professionals. Instead, the workforce comprises roughly 300 employees heavily populated by PhDs in mathematics, physics, computer science, astrophysics, and cryptography.
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The crown jewel of Renaissance is the legendary Medallion Fund. Operating with strict capacity constraints to preserve edge, Medallion has achieved an unparalleled historical track record, averaging roughly 66% annual gross returns, and about 39% net of the steep 5% management and 44% performance fees, over a three-decade span. Medallion is so lucrative that it has been completely closed to outside investors since 1993. It is managed exclusively for Renaissance employees and their families. For the public and institutional clients, the firm manages separate portfolios, including the Renaissance Institutional Equities Fund (RIEF) and the Renaissance Institutional Diversified Alpha (RIDA). According to regulatory filings from earlier this year, Renaissance Technologies has a core 13F equity portfolio valued at $63.9 billion. Following the passing of Jim Simon in 2024, the firm continues to be led by CEO Peter Brown, a computational linguist who joined in 1993.
Our Methodology
For this article, we selected stocks by combing through the 13F portfolio of Renaissance Technologies at the end of the first quarter of 2026. Data for the hedge fund sentiment surrounding each stock was taken from Insider Monkey’s Q1 2026 database of 1041 elite hedge funds.
Why are we interested in the stocks that hedge funds pile into? The reason is simple: our research has shown that we can outperform the market by imitating the top stock picks of the best hedge funds. Our quarterly newsletter’s strategy selects 14 small-cap and large-cap stocks every quarter and has returned 498.7% since May 2014, beating its benchmark by 303 percentage points (see more details here).
Jim Simons of Renaissance Technologies
Best Stocks to Invest In According to Jim Simons’ Renaissance Technologies
12. Roblox Corporation (NYSE:RBLX)
Renaissance Technologies’ Stake: $403 Million
Roblox Corporation (NYSE:RBLX) has featured in the 13F portfolio of Renaissance Technologies since the second quarter of 2021. Back then, this position comprised 754,000 shares and was sold off by the next quarter. A new position was then disclosed in the fourth quarter of 2021, comprising 5.4 million shares. Since then, the stock has been a mainstay in the portfolio of the fund. By mid-2022, the fund had grown this stake to 11.5 million shares. Thereafter, it trimmed the holding, bringing it down to around 4.3 million shares by the middle of 2024. Filings for the first quarter of 2026 show that the fund owned 7.1 million shares in the firm, up over 7% compared to filings for the previous quarter.
Roblox Corporation (NYSE:RBLX) operates an immersive platform for connection and communication in the United States and internationally. The stock has suffered in recent weeks after management slashed full-year 2026 bookings guidance down to a range of $7.33 billion–$7.6 billion, from an initial $8.28 billion–$8.55 billion forecast, citing short-term friction from newly implemented child-safety and age-verification protocols. However, elite investors are looking past this to examine the raw infrastructure metrics. In Q1 2026, Daily Active Users surged 35% year-over-year to 132 million, proving that the core network of the platform remains incredibly strong. Q1 2026 bookings actually grew 43% year-over-year, and the company posted $1.4 billion in Q1 revenue, beating baseline structural expectations.
