Glaxosmithkline traded at $40.50 this Friday September 5th, increasing $0.89 or 2.25 percent since the previous trading session. Looking back, over the last four weeks, Glaxosmithkline gained 10.20 percent. Over the last 12 months, its price fell by 7.26 percent. Looking ahead, we forecast Glaxosmithkline to be priced at 40.28 by the end of this quarter and at 39.63 in one year, according to Trading Economics global macro models projections and analysts expectations.