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NEW YORK — MediaPort, the independent company formed by the three largest media agency holding companies to develop a business standard for buying media electronically, has lost the backing of its patrons and shut down, as its owners explore the purchase of Donovan Data Systems. The New York-based company was formed in April 2001 by WPP Group, Omnicom and the Interpublic Group of Cos. but became an untenable investment due to the poor ad economy, a source said.
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