Multinational corporations have many dimensions and can be viewed from several perspectives (ownership, management, strategy and structural, etc.) The following is an excerpt from Franklin Root (International Trade and Investment, 1994)
Ownership criterion: some argue that ownership is a key criterion. A firm becomes multinational only when the headquarter or parent company is effectively owned by nationals of two or more countries. For example, Shell and Unilever, controlled by British and Dutch interests, are good examples. However, by ownership test, very few multinationals are multinational. The ownership of most MNCs are uninational. (see videotape concerning the Smith-Corona versus Brothers case) Depending on the case, each is considered an American multinational company in one case, and each is considered a foreign multinational in another case. Thus, ownership does not really matter.
Nationality mix of headquarter managers: An international company is multinational if the managers of the parent company are nationals of several countries. Usually, managers of
References: Howard V. Perlmutter, "The Tortuous Evolution of the Multinational Corporation," Columbia Journal of World Business, 1969, pp. 9-18. Bennett, R. (2005) International Business: Frameworks, Pearson Education, New Delhi. Multinationa Corporations; http://www.econ.iastate.edu/classes/econ355/choi/mul.htm