Photographer: Michael Nagle/Bloomberg For skeptics questioning how much further US stocks can climb after a blockbuster run, one of the market’s dominant forces remains decisively bullish: individual investors. Retail traders have extended a buying spree into the new year, following a record-setting performance in 2025, an analysis from JPMorgan Securities’ Arun Jain shows. Purchases in the first four trading days of January hit the second-highest level in almost eight months, the firm’s data showed, whi ...