SPTM vs. ITOT: Which Total U.S. Stock Market ETF Is the Better Buy in 2026?

The State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF (NYSEMKT:SPTM) and the iShares Core S&P Total U.S. Stock Market ETF (NYSEMKT:ITOT) offer nearly identical low-cost exposure to the broad U.S. equity market, with similar risk-return profiles.

Investors seeking a "buy everything" approach often gravitate toward total market funds like these. Both ETFs aim to capture the performance of the entire domestic stock landscape -- ranging from massive tech giants to smaller industrial firms -- providing a core foundation for long-term portfolios. These funds are designed for investors who prefer a hands-off strategy while maintaining exposure to thousands of American businesses.

Snapshot (cost & size)

Beta measures price volatility relative to the S&P 500; beta is calculated from five-year monthly returns. The 1-year return represents total return over the trailing 12 months. Dividend yield is the trailing-12-month distribution yield.

Both funds charge identical fees, with a low 0.03% expense ratio. And while the funds’ dividend yields are very similar -- around 1% -- minor differences in index construction lead to small variations in the actual payouts.

Performance & risk comparison

What's inside

Launched in 2004, ITOT is designed to replicate the S&P Total Market Index -- a comprehensive benchmark of American equities -- and holds about 2,500 stocks. Its sector allocation is led by technology at 37.2%, followed by financial services at 11.4%, and consumer cyclical at 9.8%. Its largest individual positions include Nvidia (NASDAQ:NVDA) at 7.0%, Apple (NASDAQ:AAPL) at 6.3%, and Microsoft (NASDAQ:MSFT) at 4.6%.

SPTM tracks the S&P Composite 1500 Index, and therefore holds roughly 1,500 stocks. It mirrors the sector tilt of its peer, with technology at 37.4%, financial services at 11.4%, and consumer cyclical at 10.1%. Its top holdings are also the same as ITOT’s -- with Nvidia at 7.3%, Apple at 6.5%, and Microsoft at 4.8%. The fund was launched in 2000.

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What this means for investors

On paper, ITOT and SPTM are about as close to twins as you'll find in the ETF world. They charge the same rock-bottom fee, lean heavily on the same mega-cap tech names, and provide exposure to the same broad slice of the American economy. For the long-term, hands-off investor, either fund can serve as a perfectly capable core holding.

That said, there’s one important difference worth understanding. ITOT -- the iShares offering -- casts a wider net. While SPTM tracks the S&P Composite 1500, a well-known index representing large-, mid-, and small-cap stocks, ITOT aims to cover the full investable U.S. equity market, which includes several thousand individual companies. This means ITOT offers slightly deeper exposure to smaller-cap businesses. And that difference in breadth shows up in the funds’ five-year return figures, with SPTM having a slight edge -- a gap that reflects the broader story of small-cap underperformance over that period.

There’s no bad choice here. Both funds deliver exactly what they promise -- cheap, broad, diversified U.S. market exposure -- and either one would make a sensible foundation for a long-term portfolio.

Andy Gould has positions in Apple and Nvidia and has the following options: long January 2027 $125 calls on Nvidia and short January 2027 $125 puts on Nvidia. The Motley Fool has positions in and recommends Apple, Microsoft, and Nvidia. The Motley Fool has a disclosure policy.