Investopedia explains 'Pac-Man'
The Pac-Man defense does not always work, but it was first successfully used in 1982 by Martin Marietta to prevent a takeover by Bendix Corp. In 1988, American Brands used it successfully against E-II, and TotalFina used it in 1999 to prevent a takeover by Elf Aquitaine. Some analysts speculated that Cadbury would try to use the Pac-Man defense against Kraft in 2009.
The Pac-Man defense may be used alone or in conjunction with other takeover defenses, such as the white knight.
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