Generated April 2026 from current fund data.
Overview
ITOT and VOO are both low-cost, index-tracking ETFs designed to capture broad U.S. stock market returns. The key difference is scope: ITOT tracks the entire S&P Total Market Index (roughly 3,500 stocks including mid-caps and small-caps), while VOO follows the S&P 500 Index (500 of the largest companies). Both charge the same 0.03% expense ratio and pay quarterly dividends, but they serve different portfolio roles.
How they differ
ITOT's defining advantage is breadth. It includes mid-cap and small-cap stocks absent from VOO, giving you exposure to about 2,500 smaller public companies. VOO's $1.42 trillion in assets dwarfs ITOT's $79.6 billion—a 18-fold difference—meaning VOO has deeper liquidity and tighter bid-ask spreads. The yield difference is negligible: ITOT at 1.04% versus VOO at 1.09%, both well below the long-term equity average. VOO's beta of exactly 1.0 reflects its pure large-cap tracking; ITOT's 1.04 beta suggests slightly higher volatility, consistent with its exposure to smaller stocks.
Who each is best for
ITOT: Core portfolio builders seeking maximum U.S. stock diversification in a single holding, especially those who want to avoid separately buying mid-cap or small-cap funds.
VOO: Investors prioritizing the deepest liquidity, tightest spreads, and largest fund ecosystem; also ideal as an anchor holding in a multi-asset portfolio or taxable accounts where trading activity needs to be minimal.
Key risks to know
- Market concentration: VOO's $1.42 trillion AUM means large institutional flows can temporarily widen spreads during high-volume sell-offs, though this is rare in normal conditions.
- Size-factor drag: ITOT's inclusion of mid- and small-caps introduces exposure to historically lower-returning market segments; in extended large-cap rallies (like 2023–2024), ITOT may lag VOO.
- Overlap and redundancy: The two funds share roughly 500 stocks, so holding both creates unnecessary duplication unless you're deliberately tilting toward mid/small-cap exposure.
- NAV stability: Both are equity ETFs with no leverage or derivative complexity, so NAV tracks the underlying index closely; no credit or structural risk.
Bottom line
If you want maximum market exposure in a single fund and accept mild underperformance during large-cap rallies, ITOT delivers broad diversification at the same cost as VOO. If you prioritize liquidity, lowest-possible trading costs, and the simplicity of owning America's 500 largest firms, VOO's vastly larger scale makes it the practical choice. Past performance of either fund does not predict future returns.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.