Categorisation of companies by market cap

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In the U.S., companies and stocks are often categorised by the following approximate market capitalization values:

• Small-cap: market cap below US$1 billion
• Mid-cap: market cap between US$1 billion and US$5 billion
• Large-cap: market cap exceeds US$5 billion

The small-cap definition is far more controversial than those for the mid-cap and large-cap classes. Typical values for the ranges are enumerated here:

• Micro-cap: market cap under US$100 million
• Nano-cap: market cap under US$50 million