Hedge Funds, Quant Funds and Multi-Manager Platforms

A hedge fund is a legal wrapper, not a strategy: a private pool, open only to wealthy and institutional investors, that may go short, use leverage and derivatives, and charges a performance fee. Inside the wrapper sits almost every trading system in this knowledge base, from Ed Thorp's warrant hedging in the late 1960s to the statistical arbitrage of Renaissance Technologies and the hundreds of risk-limited "pods" of Millennium and Citadel. The industry is larger than it has ever been. Hedge Fund Research (HFR) put global hedge-fund capital at a record ~$5.22 trillion at the end of Q1 2026, then ~$5.6 trillion after a record ~$409bn gain in Q2 2026, and ~$5.64 trillion at the end of Q3 2026, the sixteenth straight quarterly rise (HFR releases and Opalesque/Hedgeweek coverage; the Q2 and Q3 figures from secondary coverage, verify against HFR). Returns were the best in years: the HFRI Fund Weighted Composite gained ~+12.5% in 2025 (HFR, Jan 2026 report; the 8 Jan release said +12.6%), its strongest calendar year since 2009, net of fees and equal-weighted across reporting funds. The big multi-manager platforms reported 2025 returns of ~17.5% at Point72, ~16.7% at Balyasny, ~10.5% at Millennium and ~10.2% at Citadel's flagship Wellington fund (Reuters, from people familiar; reported, net of fees, unaudited). Under those headlines sit the facts this section is about. Investors in multi-manager funds keep a shrinking share of gross profit because the funds pass most of their costs to clients: Citadel's three flagship multi-strategy funds were charged nearly $4.5bn of operating costs in 2025 (Bloomberg, from bond offering documents; reported). Quant funds' edge decays as it is published and copied (McLean–Pontiff 2016). Industry indices flatter the average fund because the dead stop reporting. And the most famous record of all, Renaissance's Medallion fund, reported at ~66% a year gross and ~39% net of fees (arithmetic averages, 1988–2018; later reports extend to 1988–2021), belongs to a fund closed to outsiders, while Renaissance's outside funds reportedly fell ~14–16% in October 2025 alone (Shared facts; reported). This section explains the wrapper and its fees, the quant pioneers, the pod-shop model and its war for talent, capacity and decay, what the industry has returned against a plain 60/40 portfolio, prime brokerage, and what 13F filings can and cannot tell you.