Index of 500 largest US publicly-traded companies representing ~85% of US market value.
Conservative investors, beginners, those seeking stability and simplicity, institutional portfolios
Index covering all publicly-traded US companies from large-cap to micro-cap across all sectors.
Long-term buy-and-hold investors, those seeking maximum diversification, growth-oriented portfolios, passive index investors
The S&P 500 and Total Stock Market are approximately 85% identical in composition, with the Total Stock Market including small and mid-cap stocks that the S&P 500 excludes. Choose S&P 500 for simplicity and large-cap focus, or Total Stock Market for broader diversification across all market capitalizations.
Both S&P 500 and Total Stock Market are excellent long-term investments with projected double-digit returns in 2026. Choose S&P 500 if you prefer simplicity, lower volatility, and proven large-cap exposure; choose Total Stock Market if you want maximum diversification and exposure to emerging small and mid-cap growth opportunities. For most passive investors, the performance difference is negligible given their 85% overlap.
Choose S&P 500 if
Conservative investors, beginners, those seeking stability and simplicity, institutional portfolios
| Metric | S&P 500 | Total Stock Market | Diff |
|---|---|---|---|
| Number of Holdings(companies) | 500 | ~3,848 | -87% |
| US Market Capitalization Covered(%) | ~85% | 100% | -15% |
| Average Constituent Market Cap(billion USD) | $800+ | $70.6 |
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Choose Total Stock Market if
Long-term buy-and-hold investors, those seeking maximum diversification, growth-oriented portfolios, passive index investors
| +1033% |
| Expense Ratio (Typical ETF)(%) | 0.03-0.09% | 0.03-0.04% | +71% |
| 2026 Projected Return (Consensus)(%) | 12% | ~11-12% | +4% |
| 30-Year Historical Average Return(%) | 10% | ~9.8% | +2% |
| Sector Concentration (Top 10)(%) | ~30-35% | ~25-28% | +23% |
| Technology Sector Exposure(%) | ~28-30% | ~24-26% | +16% |
| Small/Mid-Cap Allocation(%) | ~0-5% | ~15-20% | -88% |
| Implementation Complexity(scale 1-10) | 2 (very simple) | 4 (moderately simple) | -50% |
| Overlap Between Indices(%) | 85% identical to Total Market | Contains all S&P 500 stocks | -15% |
All figures sourced from publicly available data. Last updated Apr 2026.
S&P 500
500 companies
Total Stock Market
~3,848 companies🏆
S&P 500
Large-cap only (~85% of US market)
Total Stock Market
All capitalizations (100% of US market)🏆
S&P 500
$800+ billion average🏆
Total Stock Market
$70.6 billion average
S&P 500
Minimal exposure
Total Stock Market
Significant exposure🏆
S&P 500
12% (analyst consensus)
Total Stock Market
~11-12% (estimated)
S&P 500
Lower (large-cap stability)🏆
Total Stock Market
Higher (small-cap included)
S&P 500
Very simple (500 stocks)🏆
Total Stock Market
Complex (thousands of stocks)
S&P 500
Concentrated in mega-caps
Total Stock Market
Comprehensive market coverage🏆
Weekly digest of trending comparisons, new categories, and expert insights. No spam.
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Weekly digest of trending comparisons, new categories, and expert insights. No spam.
Join 1,000+ readers. Unsubscribe anytime.
The S&P 500 includes only the 500 largest US companies (~85% of market value), while the Total Stock Market includes all 3,848+ publicly-traded US companies across all size categories. They overlap by about 85%, meaning the S&P 500 missing the additional small and mid-cap stocks.
Dive deeper with these curated resources
| Attribute | S&P 500 | Total Stock Market |
|---|---|---|
| Number of Holdings(companies) | 500 | ~3,848 |
| Overlap Between Indices(%) | 85% identical to Total Market | Contains all S&P 500 stocks |
| US Market Capitalization Covered(%) | ~85% | 100% |
| Average Constituent Market Cap(billion USD) | $800+ | $70.6 |
| Expense Ratio (Typical ETF)(%) | 0.03-0.09% | 0.03-0.04% |
| 2026 Projected Return (Consensus)(%) | 12% | ~11-12% |
| 30-Year Historical Average Return(%) | 10% | ~9.8% |
| Volatility Profile(relative) | Lower (large-cap focus) | Higher (includes small-cap) |
| Sector Concentration (Top 10)(%) | ~30-35% | ~25-28% |
| Technology Sector Exposure(%) | ~28-30% | ~24-26% |
| Small/Mid-Cap Allocation(%) | ~0-5% | ~15-20% |
| Implementation Complexity(scale 1-10) | 2 (very simple) | 4 (moderately simple) |
Side-by-side comparison of numeric attributes
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