Transaction in Own Shares

GlaxoSmithKline PLC
20 May 2005


GlaxoSmithKline plc (the "Company") announces that in accordance with the
authority granted by shareholders at the Company's Annual General Meeting on 17
May 2004 it purchased 750,000 of its Ordinary Shares of 25 pence each ("Shares")
on 20 May 2005 at a price of 1348.27 pence per Share.

The Company intends to hold these Shares in treasury.

Following the purchase of these Shares, the Company holds 91,533,000 of its
shares in treasury and has 5,850,948,832 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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