GlaxoSmithKline (GSK) Outpaces Stock Market Gains: What You Should Know Posted byZacks Equity Research December 15, 2021 Leave a comment on GlaxoSmithKline (GSK) Outpaces Stock Market Gains: What You Should Know GlaxoSmithKline (GSK) closed at $43.66 in the latest trading session, marking a +1.77% move from the prior day.