State Street offers investors a clean factor split of the S&P 500 through the SPDR Portfolio S&P 500 Value ETF (NYSEARCA:SPYV) and the SPDR Portfolio S&P 500 Growth ETF (NYSEARCA:SPYG). Same issuer, same parent index, opposite factor tilts. The gap between them right now is the story: SPYG is up 10.29% year to date while ... SPYG Has Beaten SPYV by 390% Over a Decade and the Reason Matters More Than You Think