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SBA Communications owns a portfolio of about 45,000 wireless towers throughout North America, South America, and Africa. It leases space on its towers to wireless service providers, who install equipment to support their wireless networks. The company has a very concentrated customer base, with most revenue in each market being generated by the top few mobile carriers. It owns more than 17,000 towers in the US, which account for about 75% of leasing revenue. Internationally, SBA's largest presence is in Brazil, where it owns roughly 10,000 towers. SBA operates as a real estate investment trust.
Western Digital is a leading vertically integrated supplier of hard disk drives. The HDD market is a practical duopoly, with Western Digital and Seagate being the two largest players. Western Digital designs and manufactures its HDDs, with much of the manufacturing and workforce located in Asia. The primary consumers of HDDs are data centers.