The PowerShares Aerospace & Defense Portfolio Fund (Ticker: PPA) seeks investment results that correspond generally to the performance, before fees and expenses, of the SPADE Defense Index. The index is a modified capitalization-weighted index comprised of publicly traded companies that benchmarks the performance of companies involved with defense, homeland security, and space. The index is composed of firms with representative business activities including: naval vessels, military aircraft, missiles and munitions, battlespace awareness, C4ISR, network centric warfare, homeland security including border security and biometric and screening systems, space systems, and satellite services. The weight of any component stock may not account for more than 10% of the total value of the index.