< PrevNext > 52. GSK Brentford, U.K. Share 2016 U.S.-Booked Air Volume: $79 millionConsolidated U.S. TMC: BCD TravelGSK's 2016 U.S.-booked air volume increased 75 percent from 2015's $45 million, according to a BTN estimate. Carbon emissions resulting from GSK's 2015 business travel and commuting amounted to 373,000 metric tons. Revenue rose 17 percent in 2016 to £27.9 billion. Last year, GSK acquired Bristol-Myers Squibb's portfolio of HIV drugs and divested its anesthesia, thrombosis and dermatology foam businesses. The pharmaceutical company reported about 100,000 employees for 2016, about 15,000 of them in the U.S. Of the 3,600 employees disciplined for policy violations, 2 percent were disciplined for T&E-related violations, down from 10 percent in 2015, according to the company's Responsible Business Supplement report. Emma Walmsley replaced Andrew Witty as CEO when he retired in March.