GlaxoSmithKline (GSK) Outpaces Stock Market Gains: What You Should Know Posted byZacks Equity Research September 2, 2021 Leave a comment on GlaxoSmithKline (GSK) Outpaces Stock Market Gains: What You Should Know GlaxoSmithKline (GSK) closed at $41.43 in the latest trading session, marking a +0.78% move from the prior day.