Sector Specific investors have the majority of their assets in a single major industry category. Many times these investors are "forced" to own most if not all of the stocks in a given sector whether or not they are deemed appropriately valued. Since their portfolio exposure is linked to a single sector, their performance is usually measured against an index that is pertinent only to that industry. As such, tweaking the relative exposure to the companies that constitute a given sector will determine these firm's investment decisions.