Director Declaration

GlaxoSmithKline PLC 05 March 2007 GlaxoSmithKline plc Non-Executive Directors' details Further to the announcement of Dr Stephanie Burns' appointment to the Board of GlaxoSmithKline plc, the following details are provided in accordance with the requirements of the Financial Services Authority's Listing Rules. Dr Burns has not been a director of a publicly quoted company during the past five years. Dr Burns has interests in 44 Ordinary Shares and 95 Ordinary Share ADRs of GlaxoSmithKline plc. These interests were acquired prior to Dr Burns taking up her appointment to the Board of GlaxoSmithKline plc. Paragraph 9.6.13 R (2) to (6) Financial Services Authority's Listing Rules Dr Burns has no details to disclose in respect of paragraph 9.6.13 R (2) to (6) of the Financial Services Authority's Listing Rules. S M Bicknell Company Secretary 5 March 2007 This information is provided by RNS The company news service from the London Stock Exchange RDNEASDSELFXEFE

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