AAII Model Mutual Fund Size and Style Definitions

Mutual Fund Cap Size and Style Definitions
We categorize mutual funds by both the size and style of their stock holdings. Size is measured by the average market capitalization (share price times the number of shares outstanding) of the stocks held by the fund, and style is based on the price-to-book value ratios (price per share divided by net assets per share) of the underlying stocks. Here is how we break down these categories:
Size Category Market Cap
Giant-Cap $15 billion and greater
Large-Cap $7 billion to $14.9 billion
Mid-Cap $2.5 billion to $6.9 billion
Small-Cap $700 million to $2.4 billion
Micro-Cap $300 million to $699 million
Nano-Cap $0 to $299 million
Style Category Price-to-Book-Value Ratio
Very High Value 1.00 and below
High Value 1.01 to 1.50
Moderate Value (Blend) 1.51 to 2.00
Low Value (Growth) 2.01 to 2.40
Very Low Value (High Growth) 2.41 and above