< PrevNext > 57. GSK London Share 2018 U.S.-Booked Air Volume: $75 millionPrimary Global Online Booking Tool: ConcurPrimary Global Expense Supplier: ConcurBTN estimates pharma giant GSK spent $8 million less on U.S.-booked air travel in 2018 than in 2017. Last year, GSK implemented SAP Concur Travel and Expense throughout the world. GSK revenue totaled 30.8 billion British pounds in 2018, up 2 percent year over year and up 5 percent at constant exchange rates. The company had about 95,400 employees at the end of 2018, down from about 98,500 one year earlier.