Key Metrics
What Is Market Cap? Understanding Company Size
Market cap tells you the total value the market assigns to a company. Here is why size matters and what different market caps mean.
The Total Price Tag
Market capitalization is the total market value of a company's outstanding shares. It answers the question: how much would it cost to buy every single share?
Market Cap = Stock Price x Shares Outstanding
Size Categories
- Mega-cap ($200B+): Apple, Microsoft, Amazon. Dominant global companies. Lower risk, moderate growth.
- Large-cap ($10B-$200B): Well-established companies with stable earnings. The backbone of most portfolios.
- Mid-cap ($2B-$10B): Growing companies with proven business models. Higher growth potential with moderate risk.
- Small-cap ($300M-$2B): Younger or niche companies. Highest growth potential but most volatile.
- Micro-cap (under $300M): Very small companies. High risk, potential for large gains or total losses.
Why It Matters for Valuation
Market cap affects how you should value a company. Large-caps deserve lower discount rates because they're more stable. Small-caps need higher discount rates to account for extra risk.
Key Takeaways
- Market cap = stock price times shares outstanding
- Larger companies are generally safer; smaller companies offer more growth
- Adjust your required margin of safety based on company size
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