Odds on Open

159 Billion-Dollar Quant Investor: Stop Only Investing in the S&P500

Nov 4, 2025
Jason Hsu, co-founder of Research Affiliates and CIO of Rayliant, shares insights on smart beta and quantitative investing. He argues that simply investing in the S&P 500 is outdated, highlighting the inefficiencies in Asian markets due to retail speculation and governance risks. Jason discusses the evolution of factor investing, emphasizing its advantages over traditional indexing. He also explains how Rayliant employs machine learning to create robust portfolios and shifts retail investors from short-term trading to long-term value creation.
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ANECDOTE

Garage Startup To PIMCO Partnership

  • Jason Hsu recounts starting Research Affiliates with one partner and a Bloomberg terminal in a garage.
  • Their first major product was the PIMCO All Asset Fund launched in 2002 to simplify multi-asset allocation for retail investors.
INSIGHT

Why Cap-Weighting Fails In Inefficient Markets

  • Cap-weighted indexes give largest weight to the biggest, often most-hyped stocks, which can be harmful in inefficient markets.
  • Smart beta (fundamental weighting) emerged as an alternative after the tech bubble showed cap-weighting pitfalls.
INSIGHT

Participant Quality Drives Market Efficiency

  • Market efficiency depends on participant quality: US markets are institutional and highly efficient.
  • Asian markets have heavier retail participation, creating more mispricings and trading opportunities.
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