Market capitalization is the total value of a company's outstanding shares. It's the simplest way to classify a company's size — and size matters enormously for risk and return.
The Formula
Market Cap = Share Price × Total Shares Outstanding
Size Categories
| Category | Market Cap Range | Example | Risk Level |
|---|---|---|---|
| Mega Cap | > $200B | Apple, Microsoft | Low |
| Large Cap | $10B – $200B | Adobe, Starbucks | Low-Medium |
| Mid Cap | $2B – $10B | Zillow, Crocs | Medium |
| Small Cap | $300M – $2B | Various | Medium-High |
| Micro Cap | < $300M | Various | Very High |
Historical Performance Comparison
Over the past 100 years, small-cap stocks have outperformed large-caps by approximately 2% per year. But this "small-cap premium" comes with significantly higher volatility.
| Metric | Small Cap | Large Cap |
|---|---|---|
| Average Annual Return | 12.1% | 10.3% |
| Standard Deviation | 28% | 18% |
| Worst Year | -52% | -37% |
| Best Year | +58% | +37% |
The Trade-Off: Higher potential returns, but much wilder swings. Small caps can drop 50%+ in a bad year.
Which Size is Right for You?
- Young investors (20s-30s): Can tolerate more small-cap exposure for higher long-term returns
- Pre-retirement (50s-60s): Should favor large-caps and mega-caps for stability
- All investors: A mix across sizes provides the best risk-adjusted returns
How Aristockrat Handles Market Cap
Our scoring algorithm adjusts expectations by market cap tier. A small-cap company growing at 25% gets evaluated differently than a mega-cap growing at 25%. This ensures you're comparing apples to apples within each size category.