From my understanding VTI and ITOT are both nearly identical total stock market ETFs with the same ER and therefore should have negligible difference in returns. I hold ITOT in Fidelity. However, looking at todays return, VTI is up 10.15% and ITOT is up only 9.61%. Going back 1 year, VTI is up 4.12% and ITOT is up 3.59%. Why is this?