Nymex Holdings, the parent of the New York Mercantile Exchange, said its shareholders approved the sale of a 10% stake to General Atlantic in a transaction that's valued at $160 million. Of the total shares voted, more than 93% were cast in favor of the deal. Nymex and General Atlantic expect to complete the transaction Tuesday. "We are pleased that our members and shareholders agree that General Atlantic is the best partner to help us make Nymex more valuable through a possible initial public offering and over the long term," said Mitchell Steinhause, chairman of Nymex. "The board looks forward to working with our new partners at General Atlantic to build on Nymex's success and position the exchange for continued growth well into the future."