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PowerShares Build America Bond Portfolio (the Fund) seeks investment results that correspond generally to the price and yield performance of an index called The BofA Merrill Lynch Build America Bond Index (the Index). The Fund will normally invests at least 80% of its total assets in the securities that comprise the Index. The Index is designed to track the performance of the United States dollar-denominated Build America Bonds publicly issued by the United States and territories, and their political subdivisions, in the United States market. The investment advisor of the Company is Invesco PowerShares Capital Management LLC.

Best Buy Co., Inc. engages in the retail of technology products in the United States, Canada, and international. Its stores provide computing and mobile phone products, such as desktops, notebooks, and peripherals; mobile phones comprising related mobile network carrier commissions; networking products; tablets covering e-readers; smartwatches; and consumer electronics consisting of digital imaging, health and fitness products, portable audio comprising headphones and portable speakers, and smart home products, as well as home theaters, which includes home theater accessories, soundbars, and televisions. The company's stores also offer appliances, such as dishwashers, laundry, ovens, refrigerators, blenders, coffee makers, vacuums, and personal care; entertainment products consisting of drones, peripherals, movies, and toys, as well as hardware and software, and virtual reality and other software products; and other products, such as baby, food and beverage, luggage, outdoor living, and sporting goods. In addition, it provides delivery, installation, memberships, repair, set-up, technical support, health-related, and warranty-related services. The company offers its products through stores and websites under the Best Buy, Best Buy Ads, Best Buy Business, Best Buy Health, Buy Mobile, CST, Current Health, Geek Squad, Lively, Magnolia, Pacific Kitchen, Home, TechLiquidators, and Yardbird brands, as well as domain names comprising bestbuy.com, currenthealth.com, lively.com, techliquidators.com, yardbird.com, and bestbuy.ca. The company was formerly known as Sound of Music, Inc. Best Buy Co., Inc. was incorporated in 1966 and is headquartered in Richfield, Minnesota.

Celsion Corporation, a clinical stage biotechnology company, focuses on the development and commercialization of DNA-based immunotherapies, vaccines, and directed chemotherapies. Its product pipeline includes GEN-1, a DNA-based immunotherapy for the localized treatment of ovarian cancer; and ThermoDox, a proprietary heat-activated liposomal encapsulation of doxorubicin, which is in development stage for various cancer indications. The company also has two feasibility stage platform technologies for the development of nucleic acid-based immunotherapies, vaccines, and other anti-cancer DNA or RNA therapies. Celsion Corporation was founded in 1982 and is based in Lawrenceville, New Jersey.