Cap weighted vs Equal Weight SPY at ExtremesAre the times when the cap wtd S&P500 is crushing the EW AMEX:SPY also the times when AMEX:SPY is most vulnerable? At present, you would have to go back to Q1 2009 to find a simliar ratio to today (using AMEX:RSP as the EW SPY in comparison to AMEX:SPY ). Another period when this extreme was reached was 2020.