Uber (UBER.US) is considering acquiring travel website Expedia, and its stock has fallen 7% in four consecutive days.

Uber (UBER.US) opened weaker on Thursday, extending its four-day losing streak and falling 7%, and as of writing, it was down 2.22% to $80.08. On the news front, on October 17, according to insiders, Uber has approached advisers in recent months to explore the idea of buying Expedia and assess the feasibility of such a deal. One of the main points of discussion was what role Uber's current CEO Dara Khosrowshahi should play in the deal, as he served as Expedia's CEO from 2005-2017 and is currently a non-executive director on Expedia's board.

If successful, the deal would be Uber's largest ever, but insiders warn that Uber's interest in acquiring Expedia is still in very early stages, and it has not yet formally approached Expedia or discussed the matter, so the acquisition may not happen.