The Fund invests in financial instruments that ProShare Advisors believes, in combination, should track the performance of the Index. The Index is designed to measure the performance of companies that provide services related to analytics, software, hardware, and computing infrastructure for managing and extracting information from large structured and unstructured data sets. The Index includes companies in at least one of nine FactSet Revere Business Industry Classification System Sub-Industries (RBICS Sub-Industries) that the index provider has identified as big data related. The nine eligible RBICS Sub-Industries are (1) Business Intelligence Software, (2) Business Intelligence/Data Warehousing Consulting, (3) Customer Service Software, (4) Data Storage Infrastructure Software, (5) Enterprise Middleware Software, (6) Government and Public Service Industry Software, (7) Information Storage Systems, (8) Network Administration Software, and (9) Peripheral and Other Commerce Equipment Makers. Companies in these sub-industries are selected if they receive 75 percent or more of their revenue from one or more of those sub-industries. Selected companies are then weighted based on their market capitalization, subject to a 4.5 percent limit.