As the world tries to make sense of the U.K.'s historic vote, three sectors could be especially hard hit.
First, there's the automotive industry. Last year, nearly 1.6 million cars were made in the U.K., with 77 percent being exported. Nearly 58 percent of exported autos went to European Union countries.
On Friday, Rolls-Royce's U.S.-listed shares fell 7.3 percent.
Then there's the airlines business, which might have to deal with new European routes, as well as higher taxes.