When was the last time an expert from a top auction house dispensed with longtime allegiances and joined forces with someone from the enemy camp? In the fiercely competitive world of Sotheby’s and Christie’s, such an occurrence is rarer than a prized Vermeer.

But for months now there have been rumors that a new powerhouse partnership was in the works, one that would replace Giraud, Pissarro, Ségalot, the superprivate superdealer that pulled off so many big transactions and whose business began winding down soon after Franck Giraud, one of its partners, announced that he was leaving to “explore options inside the art world and out.”

The players making up this new venture, however, had been something of a guessing game.