10 Largest IPO Valuations in History

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10. Nippon Telegraph & Telephone Corp (ADR) (NYSE:NTT) (1987): $15.3 billion

Ranking tenth on our list of the largest IPO valuations in history is Nippon Telegraph & Telephone Corp raising $15.3 billion in February 1987. It is a Japanese telecommunications company with a market capitalization of $94 billion and engages in providing mobile and data communication services regionally and internationally. NTT is one of the oldest and largest IPOs of all times globally.

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