VTI vs SPTM: Total Market Showdown
VTI is the household-name total-market fund; SPTM is SPDR's nearly identical, much smaller rival at the same fee. Here's what separates the giant from the underdog.
Don't have time? Here's what you need to know:
- 1VTI and SPTM both target the total U.S. market for around 0.03% — fees are a wash.
- 2VTI tracks ~3,600 stocks down to micro caps; SPTM tracks the ~1,500-stock S&P 1500, excluding micro caps.
- 3VTI is far larger and more liquid, with tighter spreads; SPTM's narrower coverage barely affects returns.
- 4Default to VTI unless you're in the SPDR ecosystem or SPTM is your commission-free total-market option.
Same Mission: Own the Entire U.S. Market
VTI (Vanguard Total Stock Market) and SPTM (SPDR Portfolio S&P 1500 Composite Stock Market) both set out to do the same thing: capture essentially the whole U.S. equity market — large, mid, and small caps — in a single low-cost fund. Both are cap-weighted, so both are dominated at the top by the same mega-cap names, and both serve well as a one-ticker U.S. equity core.
Their indexes differ in the details. VTI tracks the CRSP US Total Market Index with around 3,600 holdings reaching down into micro caps. SPTM tracks the S&P Composite 1500, which covers roughly 1,500 large-, mid-, and small-cap names but stops short of the smallest micro caps. The S&P 1500 still captures around 90% of U.S. market value, so the practical difference in coverage is small.
Cost Is Tied; Scale Is Not
On fees they're effectively equal: both VTI and SPTM carry an expense ratio around 0.03%. So cost, the usual deciding factor, is a wash here. The real gap is in scale and recognition.
VTI is one of the largest ETFs in the world, with enormous assets and tens of millions of shares traded daily, giving it razor-thin bid-ask spreads. SPTM is a perfectly legitimate fund but vastly smaller and less heavily traded, so its spreads can be a touch wider. For a buy-and-hold investor making modest purchases, that difference is negligible; for anyone trading larger sizes or wanting maximum liquidity, VTI has the clear edge.
| VTI | SPTM | |
|---|---|---|
| Issuer | Vanguard | SPDR (State Street) |
| Index | CRSP US Total Market | S&P Composite 1500 |
| Holdings | ~3,600 | ~1,500 |
| Coverage | Large + mid + small + micro | Large + mid + small |
| Expense ratio | ~0.03% | ~0.03% |
| Relative size & liquidity | Very large, very liquid | Smaller, less liquid |
Does the Coverage Difference Matter?
Because both funds are cap-weighted, the micro caps that VTI holds and SPTM omits sit at the very bottom of VTI's portfolio with tiny weights. They contribute almost nothing to returns or risk on a day-to-day basis. So while VTI is technically the more "complete" total-market fund, SPTM's narrower reach into the smallest stocks has a barely measurable effect in practice.
Expect VTI and SPTM to deliver very similar total returns over time — the kind of gap that flickers in either direction year to year rather than compounding consistently one way. Neither methodology is obviously superior; they're two reasonable definitions of "the U.S. market" that land in nearly the same place.
Tip: If you want the most complete, most liquid total-market fund and don't already have a reason to prefer SPDR, VTI is the straightforward default.
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Which to Pick
For most investors, VTI is the easy default: same cost, broader coverage, far deeper liquidity, and a long track record as a portfolio cornerstone. It's the natural U.S. equity core for a three-fund portfolio.
SPTM earns its place when it fits your ecosystem — for example, if you're building a portfolio of SPDR Portfolio funds, which are designed as a cheap, coherent lineup, or if SPTM is the commission-free total-market option at your brokerage. In that context, choosing SPTM over VTI costs you essentially nothing in performance. Outside it, there's little reason to step away from the larger, more liquid VTI.
Important: Don't pair VTI and SPTM expecting diversification — they're both total-market funds tracking nearly the same stocks. Owning both just duplicates your core holding.
Frequently Asked Questions
Is VTI or SPTM better?
For most investors VTI is the easier choice: it costs the same ~0.03%, covers more of the market (including micro caps), and is far larger and more liquid. SPTM is a solid, near-equivalent fund that makes sense mainly if you're in the SPDR ecosystem or it's the commission-free total-market option at your broker. Performance between them is nearly identical.
What's the difference between VTI's and SPTM's coverage?
VTI tracks the CRSP US Total Market Index with ~3,600 holdings reaching down into micro caps. SPTM tracks the S&P Composite 1500 with ~1,500 holdings, covering large, mid, and small caps but excluding the smallest micro caps. Since both are cap-weighted, those micro caps carry tiny weights, so the practical difference is minimal — the S&P 1500 still captures around 90% of U.S. market value.
Do VTI and SPTM perform differently?
Only marginally. Because both are cap-weighted total-market funds dominated by the same large caps, their returns track closely, with small year-to-year differences that don't consistently favor one. Neither methodology is clearly superior — they're two reasonable ways to own essentially the whole U.S. market.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.