Hedge Funds, Quants and Pod Shops

In 2020 one firm on Long Island ran two kinds of fund, staffed by the same researchers and drawing on the same data, and they went in opposite directions. Renaissance Technologies' Medallion fund, owned by the firm's employees, former employees and their families, gained about 76%. Its Renaissance Institutional Equities Fund (RIEF), sold to pensions, endowments and wealthy investors, lost about a fifth, and its market-neutral and global-equity siblings lost more (press accounts as cited in the companion; reported). Clients withdrew about $5 billion between December 2020 and February 2021 alone, and about $15 billion over the 14 months to early 2022 (reported). Five years later the pattern returned in miniature. RIEF fell 14.39% in October 2025, leaving it 7.5% down for the year, then rose 12.65% in November, to about 2.3% up for the year at the end of the month (Institutional Investor, reported; the full year is not confirmed).

Medallion is the strongest trading record ever reported: about 66% a year before fees and about 39% after them, a figure that should always be cited with its period and source, 1988–2018 in Gregory Zuckerman's The Man Who Solved the Market (2019) and 1988–2021 in later reports; both are arithmetic averages of annual returns, not compounded rates. The evidence is of the third kind in Chapter 4's ladder: live but unaudited, Medallion's own reports as quoted in a book and the press. Even on its own terms the series is approximate. The fees changed over the period, 5% of assets and 20% of profits to 1994 and later 5% and 44%; 66% gross less the later fees alone would leave about 34%, so an average of about 39% net over the whole period is plausible, and one 2024 working paper argues that the compounded return before fees was far lower. Nobody outside the firm could have earned it. Medallion closed to new outside money in 1993, bought out its last outside investors in 2005 and pays out its profits to stay near a reported $10 billion (reported).

The gap between the two funds is the most useful fact in this chapter. Renaissance says its outside funds run different models, built for capacity: longer holding periods, more money, lower turnover. Medallion's edge is a very large number of short-horizon predictions, each right only slightly more than half the time, traded so often that the law of large numbers does the rest, as in Chapter 7's market makers. Such an edge cannot absorb much money, because the price impact of trading it rises with size. Inside one firm, with the same people, the edge that cannot grow earned extraordinary returns, and the products built to grow earned ordinary ones. Capacity, not talent, set the limit.