David Jeria

How Retail Investors Are Shaping Markets

John Marshall, Greg Tuorto, David Jeria, Allison Nathan

Retail participation in U.S. equity markets surged to a dominant 30% share of trading volume by 2021 before undergoing a sharp reversal characterized by systematic profit-taking and a structural shift from speculative individual stocks to passive ETFs and energy sectors. This behavioral divergence between active day traders and "buy and hold" investors has altered market liquidity dynamics, driving significant order flow off-exchange and increasing transaction costs for institutional players while prompting SEC Chairman Gensler to explore regulatory reforms aimed at improving price discovery. Despite these structural changes and elevated risks in single-stock herding, analysts project a stable market baseline supported by automatic investment flows, with future retail activity primarily contingent on broader macroeconomic factors such as inflation relative to wage growth.