Director/PDMR Shareholding

GlaxoSmithKline PLC 20 March 2007 Notification of Transactions of Directors, Persons Discharging Managerial Responsibility or Connected Persons I give below details of changes in the interests of Directors, Persons Discharging Managerial Responsibility or Connected Persons in the Ordinary Shares of GlaxoSmithKline plc. 12 March 2007 The Administrators of the SmithKline Beecham Employee Benefit Trust ("the Trust") notified the Company on 20 March 2007 that 3,096 Ordinary shares had been sold on 12 March 2007 on behalf of participants in the SmithKline Beecham Bonus Investment Plan at a price of £14.45 per share. The Trust notified the Company on 20 March 2007 that 6,146 Ordinary shares had been transferred to participants in the SmithKline Beecham Bonus Investment Plan. 13 March 2007 The Trust notified the Company on 20 March 2007 that 948 Ordinary shares had been transferred on 13 March 2007 to a participant in the SmithKline Beecham Annual Investment Plan. The Trust notified the Company on 20 March 2007 that 1,441 Ordinary shares had been transferred on 13 March 2007 to a participant in the SmithKline Beecham Bonus Investment Plan. The Trust is a discretionary fund of which all non US employees or former employees of GlaxoSmithKline plc and its subsidiaries are potential beneficiaries. One of the Company's directors, Mr J S Heslop is therefore interested in the shares held in the fund from time to time in the same way as other non US employees or former employees of GlaxoSmithKline plc and its subsidiaries. This notification relates to a transaction notified in accordance with Disclosure Rule 3.1.4R(1)(b). S M Bicknell Company Secretary 20 March 2007 This information is provided by RNS The company news service from the London Stock Exchange

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