The iShares Core S&P Total U.S. Stock Market ETF (ITOT) and Vanguard Total Stock Market ETF (VTI) are among the largest ETFs to invest passively in the US equity market. For the longest common period since 2004, ITOT underperformed VTI by about 20%-points or slightly more than 20 basis points per year. However, just looking at this long-term performance chart is somewhat misleading here. Because of several changes, the two funds tracked 5 different indices over the last 15 years. Starting in December 2015, ITOT switched from the S&P 1500 to the S&P Total Market Index which made the two ETFs mostly comparable. The performance gap to VTI also narrowed.
ITOT Vs. VTI: Since 2015 Very Similar, But VTI Still Ahead (NYSEARCA:ITOT)
