S&P 500 has returned to record highs after a >19% surge in 41 trading days from the March low, but the pace of gains has materially slowed, DataTrek Research says. DataTrek describes the rebound as approaching a two-sigma move—about two standard deviations above any 100‑day average return—which could indicate momentum-driven "quick money" is largely spent. The firm warns investors to prepare for a slower, choppier US summer, with consolidation or range-bound trading likely, Jessica Rabe wrote.