Founded in 1983, Mobile Mini is the world's leading provider of portable storage solutions through our lease fleet of over 213,000 portable storage and portable office units. We went public in 1994 and now trade on NASDAQ under the symbol MINI. We are part of the Russell 2000® and 3000® Indexes and the S&P Small Cap Index.
We offer our customers a wide range of portable storage and office products in varying lengths and widths with an assortment of differentiated features such as our proprietary security systems, multiple door options, and 100 different configuration options. Our customers can either rent or buy our products, but most prefer to rent due to the short-term nature of their needs. We market, service, and distribute our products through a network of company-owned branch locations in the U.S., Canada and the UK with more than 1,500 dedicated employees. While we do have a national presence, we believe it is important to service our customers at the local level.
Each of our branch locations can effectively service an entire city and are staffed with a local manager, salespeople, field service personnel, drivers, and rental inventory. Our portable units provide storage and office space solutions to approximately 84,000 customers including large and small retailers, construction companies, medical centers, schools, utilities, distributors, the U.S. military, hotels, restaurants, entertainment complexes, and households. Our customers use our products for many temporary storage and office applications including excess inventory storage, seasonal merchandise, record storage, remodeling and construction, warehouse and office expansion, sports and recreational equipment, sales offices, in-plant offices, security guards, sporting events, and much more.
Our customers make their rental buying decisions based on convenience (delivered to their site, access contents anytime, etc.), security of unit, size of unit, door configurations, price, ease of access, delivery availability, customer service, condition of fleet, and reputation. We believe we have the most secure, best maintained and largest selection of storage units in our industry. We have successfully grown Mobile Mini because of our consistent attention to a number of key marketing, sales, operational, and customer service drivers. These include internal growth focus by increasing market awareness, product differentiation, local customer service, sales emphasis, employee retention, promotion from within, and geographic expansion.
We continue to implement new initiatives through our Lean Six Sigma program and increased efforts to become a green company. We take pride in the convenience, customer service, and high-security products that we offer our customers. We are very proud that our customers have rated Mobile Mini with a Best in Class Customer Loyalty Net Promoter Score. We are constantly looking for ways to improve our service and exceed expectations. We do this by investing in our most valuable resource, our employees. We provide training and growth opportunities for our people and a work environment that fosters teamwork and accountability. Many of our managers began working for Mobile Mini as branch salespeople or branch operational positions.