The Index is a rules-based, modified float-adjusted market capitalization-weighted index that tracks the performance of the thirty largest U.S. listed semiconductor companies. Semiconductor companies are defined as those classified within the Semiconductors Industry of the ICE Uniform Sector Classification schema. This includes companies that either manufacture materials that have electrical conductivity (semiconductors) to be used in electronic applications or utilize LED and OLED technology. This also includes companies that provide services or equipment associated with semiconductors such as packaging and testing. The Index is rebalanced quarterly and reconstituted annually.