iShares Core S&P Total U.S. Stock Market ETF’s 0.03% Fee and BlackRock Scale Face Off Against Vanguard Total Stock Market ETF’s Structural Advantages

Vanguard Total Stock Market ETF (NYSEARCA:VTI) and iShares Core S&P Total U.S. Stock Market ETF (NYSEARCA:ITOT) both promise the entire investable US equity market in a single ticker. Yet the index each fund tracks, the issuer behind it, and the fee structure differ in ways that matter once you commit real capital. With volatility now at 17.39, this is a calm moment to compare them.

Same Mission, Different Plumbing

VTI tracks the CRSP US Total Market Index. ITOT, run by BlackRock’s iShares, follows the S&P Total Market Index (TMI). Both reach across mega caps, mid caps, and small caps, so the top of each portfolio looks nearly identical.

ITOT’s published top holdings include NVIDIA at 6.69%, Apple at 5.88%, Microsoft at 4.34%, Amazon at 3.21%, and Alphabet’s Class A shares at 2.64%. Sector weights skew where the market skews, with Information Technology at 30.93%, Financials at 12.89%, and Industrials at 10.28%. VTI’s profile mirrors this closely because both indexes capture roughly the same opportunity set.

Cost, Scale, and Index Methodology

ITOT’s net expense ratio sits at 0.03%, which is about as cheap as broad equity exposure gets. VTI’s expense ratio was not reported in our snapshot. Index construction is the more interesting variable. CRSP uses banded reconstitution to reduce turnover; S&P TMI applies committee oversight and profitability screens to its inclusion criteria. Over long horizons, that nudges micro-cap exposure in slightly different directions.

Recent Performance

Year to date through May 7, VTI has returned 7.42% while ITOT has returned 7.83%. Over the trailing year, VTI gained 30.44% versus ITOT’s 32.02%. VTI’s series is unadjusted while ITOT’s is adjusted for distributions, which inflates ITOT’s longer-window numbers like the 302.43% ten-year return. Total-return data should put these funds within basis points of each other.

What to Watch Through 2026

Concentration risk matters more than tracker preference. With NVIDIA alone at 6.69% and the top names dominated by AI-exposed mega caps, both funds rise and fall with the same handful of stocks. If AI capex slows, neither index can hide. Watch for fee announcements. Vanguard and iShares regularly trim basis points to stay competitive.

The Verdict

On a published-data basis, ITOT shows a clearer cost profile for new buyers. The published 0.03% expense ratio is concrete, the iShares ecosystem pairs cleanly with other Core funds, and S&P TMI’s methodology feels marginally more curated. For existing VTI holders in a taxable account, the capital-gains cost of switching typically outweighs the marginal differences between the two funds. For Vanguard loyalists or anyone using a Vanguard brokerage, VTI’s structural link to the underlying mutual fund is a quiet advantage. Either fund delivers comparable broad-market exposure on the data. Holding both delivers minimal incremental diversification given the near-identical underlying exposure.