MetLife, Inc. is the holding corporation for the Metropolitan Life Insurance Company (MLIC), better known as MetLife, and its affiliates. MetLife is among the largest global providers of insurance, annuities, and employee benefit programs, with 90 million customers in over 60 countries. The firm was founded on March 24, 1868.On January 6, 1915, MetLife completed the mutualization process, changing from a stock life insurance company owned by individuals to a mutual company operating without external shareholders and for the benefit of policyholders. The company went public in 2000. Through its subsidiaries and affiliates, MetLife holds leading market positions in the United States, Japan, Latin America, Asia’s Pacific region, Europe, and the Middle East. MetLife serves 90 of the largest Fortune 500 companies. The company’s principal offices are located at 1095 Avenue of the Americas in Midtown Manhattan, New York City, though it retains some executive offices and its boardroom in the MetLife Building, located at 200 Park Avenue, New York City, which it sold in 2005.Corporate structure, the company was "organized into five segments: Insurance Products, Retirement Products," the US Business, and International. The Insurance Products division was the largest unit, accounting for 53% of 2009 revenue. By 2015, a division referred to as "Americas" had emerged.