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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.

Brady Corporation manufactures and supplies identification solutions (IDS) and workplace safety (WPS) products to identify and protect premises, products, and people in the United States and internationally. The company offers materials, printing systems, RFID, and bar code scanners for product identification, brand protection labeling, work in process labeling, finished product identification, and industrial track and trace applications; safety signs, floor-marking tapes, pipe markers, labeling systems, spill control products, lockout/tagout device, and software and services for safety compliance auditing, procedure writing, and training; and hand-held printers, wire markers, sleeves, and tags for wire identification. It also provides name tags, badges, lanyards, rigid card printing systems, and access control software for people identification; and wristbands, labels, printing systems, and other products for tracking and improving the safety of patients. In addition, the company offers workplace safety, identification, and compliance products, such as safety and compliance signs, tags, labels, and markings; informational signage and markings; asset tracking labels; facility safety and personal protection equipment; first-aid products; and other compliance products for process, government, education, construction, and utilities industries. Further, it provides stock and custom identification products; and sells related resale products. The company serves industrial and electronic manufacturing, healthcare, chemical, oil, gas, automotive, aerospace, governments, mass transit, electrical contractors, education, leisure and entertainment, telecommunications, and other industries through distributors, direct sales force, and digital channels. Brady Corporation was incorporated in 1914 and is headquartered in Milwaukee, Wisconsin.

Kennametal Inc. engages in development and application of tungsten carbides, ceramics, and super-hard materials and solutions for use in metal cutting and extreme wear applications to enable customers work against corrosion and high temperatures conditions worldwide. The company operates through two segments, Metal Cutting and Infrastructure. It offers standard and custom products, including turning, milling, hole making, tooling systems, and services, as well as specialized wear components and metallurgical powders for manufacturers engaged in various industries, such as the manufacturers of transportation vehicles and components, machine tools, and light and heavy machinery; airframe and aerospace components; and energy-related components for the oil and gas industry, as well as power generation. In addition, the company provides specified product design, selection, application, and support services; and standard and custom metal cutting solutions to aerospace, general engineering, energy, and transportation customers. Further, it produces compacts, nozzles, frac seats, and custom components used in oil and gas, and petrochemical industries; rod blanks and abrasive water jet nozzles for general industries; earth cutting tools and systems used in underground mining, trenching and foundation drilling, and road milling; tungsten carbide powders for the oil and gas, aerospace, and process industries; and ceramics used by the packaging industry for metallization of films and papers. The company provides its products under the Kennametal, WIDIA, WIDIA Hanita, and WIDIA GTD brands through its direct sales force; a network of independent and national distributors; integrated supplier channels; and through the Internet. The company was founded in 1938 and is based in Pittsburgh, Pennsylvania.

Proto Labs, Inc., together with its subsidiaries, operates as a digital manufacturer of custom parts in the United States and Europe. The company offers injection molding; computer numerical control machining; three-dimensional printing; and sheet metal fabrication products. It serves developers and engineers, who use 3D computer-aided design software to design products across a range of end-markets. Proto Labs, Inc. was incorporated in 1999 and is headquartered in Maple Plain, Minnesota.