Transaction in Own Shares

GlaxoSmithKline PLC
03 August 2005




GlaxoSmithKline plc (the "Company") announces that in accordance with the
authority granted by shareholders at the Company's Annual General Meeting on 25
May 2005 it purchased 750,000 of its Ordinary shares of 25 pence each ("shares")
on 3 August, 2005 at a price of 1335.1268 pence per share.



The Company intends to hold these shares in Treasury.



Following the purchase of these shares, the Company holds 100,653,000 of its
shares in Treasury and has 5,843,160,237 shares in issue (excluding Treasury
shares).



This announcement does not constitute, or form part of, an offer or any
solicitation of an offer to purchase or subscribe for securities in any
jurisdiction.


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