Buy RSP by May 19, 2028.

Been tracking the gap between SPX (cap weighted) and RSP (equal weight) for about two years. Last week the trailing 12 month return spread widened to 13.8 percentage points in favor of cap weighted. That level has only been reached twice before in the modern era: March 2000 and November 2021. Both of those times, mega caps went on to significantly underperform over the next 18 months. Which, you know, doesn't prove anything on its own. But it got me …