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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.

GrafTech International Ltd. research, develops, manufactures, and sells graphite and carbon-based solutions worldwide. The company offers graphite electrodes to produce electric arc furnace steel and other ferrous and non-ferrous metals; and petroleum needle coke, a crystalline form of carbon used in the production of graphite electrodes and synthetic graphite. It sells its products primarily through direct sales force, independent sales representatives, and distributors. GrafTech International Ltd. was founded in 1886 and is headquartered in Brooklyn Heights, Ohio.

Greif, Inc. engages in the production and sale of industrial packaging products and services worldwide. The company operates through Global Industrial Packaging; Paper Packaging & Services; and Land Management segments. The Global Industrial Packaging segment produces and sells industrial packaging products, including steel, fiber, and plastic drums; rigid and flexible intermediate bulk containers; closure systems for industrial packaging products; transit protection products; water bottles, and remanufactured and reconditioned industrial containers; and various services, such as container life cycle management, filling, logistics, warehousing, and other packaging services to chemicals, paints and pigments, food and beverage, petroleum, industrial coatings, agriculture, pharmaceuticals, mineral product, and other industries. The Paper Packaging & Services segment produces and sells containerboards, corrugated sheets and containers, and other corrugated and specialty products to customers in the packaging, automotive, food, and building products markets; and produces and sells coated and uncoated recycled paperboard, and recycled fiber. This segment's corrugated container products are used to ship various products, such as home appliances, small machinery, grocery products, automotive components, books, and furniture, as well as various other applications. The Land Management segment engages in harvesting and regeneration of timber properties; and sale of timberland and special use properties. As of October 31, 2023, this segment owned approximately 175,000 acres of timber properties in the southeastern United States. The company was formerly known as Greif Bros. Corporation and changed its name to Greif, Inc. in 2001. Greif, Inc. was founded in 1877 and is headquartered in Delaware, Ohio.

Kornit Digital Ltd. develops, designs, and markets digital printing solutions for the fashion, apparel, and home decor segments of printed textile industry in the United States, Europe, the Middle East, Africa, the Asia Pacific, and internationally. Its solutions include digital printing systems, ink and other consumables, associated software, and value-added services. The company's products and services include direct-to-garment printing platform for smaller industrial operators to mass producers; NeoPigment ink and other consumables; QuickP designer software; and system upgrade kits, maintenance and support, consulting, and professional services. It serves decorators, online businesses, brand owners, and contract printers. Kornit Digital Ltd. was incorporated in 2002 and is headquartered in Rosh Haayin, Israel.