Specialty - This category encompasses a range of styles that are not based on the financial fundamentals of the stocks in the portfolio relative to the overall market. Examples include investors that hold a particularly high concentration of a single stock or a very small set of stocks, or specialize in convertible securities. This category is also reserved for any institution or mutual fund that does not meet the criteria for any of the other investment styles. Thomson Reuters categorizes these portfolios based on its specific knowledge of their historical investment behavior.