NEW YORK — American Express Co. is buying marketing services company Loyalty Partner in a $660 million deal that will boost its overseas presence.
The credit card company will pay $566 million in cash. The transaction also includes $94 million in equity interest that will be held by Loyalty Partner’s management. American Express will obtain that interest over the next five years at a value based on business performance.
American Express said Thursday that the acquisition will enhance its merchant relationships in markets....