GlaxoSmithKline (GSK) Gains But Lags Market: What You Should Know Posted byZacks Equity Research January 11, 2022 Leave a comment on GlaxoSmithKline (GSK) Gains But Lags Market: What You Should Know GlaxoSmithKline (GSK) closed at $45.04 in the latest trading session, marking a +0.45% move from the prior day.