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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.
Labcorp is one of the nation's two largest independent clinical laboratories, with roughly 20% of the independent lab market. The company operates approximately 2,000 patient-service centers, offering a broad range of 5,000 clinical lab tests, ranging from routine blood and urine screens to complex oncology and genomic testing.