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“The trading floor, while iconic, may seem to be an anachronism in this high-speed world of electronic this and electronic that, but it still survives because the customers that use the trading floor still see the added value of having some human intervention,” Mr. Costa said in an email.

Mr. Costa, also an NYSE stockholder, said that while the premium that ICE was paying was not as high as he would have liked, it was “still fairly generous.”