Note that some mutual companies, such as Nationwide Mutual Insurance Company and the MassMutual, have owned stock companies listed on a stock exchange. Nationwide bought back its subsidiary stock company in full, on December 31, 2008. These are not MHCs, however; they are simply mutual companies which have majority control over one or more stock companies. Other mutual companies may own some of another company's stock, but as simply an asset, not something they actually control. Finally, many mutual companies, including Nationwide and MassMutual, have wholly owned subsidiaries. The subsidiaries may technically be stock companies, but the mutual owns all the stock. For example, the "New York Life Insurance and Annuity Corporation" (NYLIAC) is a wholly owned subsidiary of the New York Life Insurance Company (NYLIC). A person may purchase an insurance policy from either company, but only those who own participating policies from NYLIC are mutual members. Other policyholders are customers.