The shareholders of Amadeus have hired investment bank Rothschild to study a possible stock offering of the travel reservations giant, a source with knowledge of the deal said on Thursday.

"The shareholders have given the mandate for an initial public offering and the search for a lead manager for the deal," the source said.

Amadeus is controlled by private equity firms BC Partners and Cinven with 52.8 percent, Air France with 23.14 percent and Iberia and Lufthansa with 11.57 percent each.

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