By David M. Aferiat, Managing Principal and Co-founder, Trade Ideas

2020 saw the emergence of the retail investor as a key player (and now stakeholder) in US equity trading. Prior to Covid, there were several developments which set the table for this trend. And once Covid hit, a perfect storm of commercial models, technology, and retail investor appetite converged into a retail investor movement, driving markets throughout the year. That trend has continued into 2021…