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Costco Wholesale Corporation, together with its subsidiaries, engages in the operation of membership warehouses in the United States, Puerto Rico, Canada, Mexico, Japan, the United Kingdom, Korea, Australia, Taiwan, China, Spain, France, Iceland, New Zealand, and Sweden. The company offers branded and private-label products in a range of merchandise categories. It offers merchandise, such as sundries, dry groceries, candies, coolers, freezers, deli, liquor, and tobacco; appliances, electronics, health and beauty aids, hardware, garden and patio products, sporting goods, tires, toys and seasonal products, office supplies, automotive care products, postages, tickets, apparel, small appliances, furniture, domestics, housewares, special order kiosks, and jewelry; and meat, produce, service deli, and bakery products. The company also operates gasoline, pharmacies, optical, food courts, hearing-aid centers, and tire installation centers; and offers business delivery, travel, grocery, and various other services online. It also operates e-commerce websites. The company was formerly known as Costco Companies, Inc. and changed its name to Costco Wholesale Corporation in August 1999. Costco Wholesale Corporation was founded in 1976 and is based in Issaquah, Washington.

The PowerShares Preferred Portfolio (Fund) is based on The BofA Merrill Lynch Core Fixed Rate Preferred Securities Index (Index). The Fund normally invest at least 90% of its total assets in securities that comprise the Index. The Index is designed to replicate the total return of a diversified group of investment-grade preferred securities. The Index is rebalanced on a monthly basis. The Fund seeks investment results that correspond generally to the price and yield (before fees and expenses) of a securities index. The Fund invests in sectors, such as basic materials, financial, utilities and unclassified. Invesco PowerShares Capital Management LLC. is the investment adviser.