Holding(s) in Company

GlaxoSmithKline PLC 26 November 2007 GlaxoSmithKline plc received on 23 November 2007 from Legal & General Group plc a notification of interests in GlaxoSmithKline plc Ordinary shares of 25 pence each dated 22 November 2007. This notice is given in accordance with DTR 5.8.12. TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Identity of the issuer or the underlying issuer of existing GlaxoSmithKline plc shares to which voting rights are attached: 2. Reason for notification (yes/no) An acquisition or disposal of voting rights Yes An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached An event changing the breakdown of voting rights Other (please specify):______________ 3. Full name of person(s) subject to the notification Legal & General Group Plc (Group) obligation: Legal & General Investment Management Limited (LGIM) 4. Full name of shareholder(s) (if different from 3.): Legal & General Assurance (Pensions Management) Limited (PMC) Legal & General Group Plc (L&G) 5. Date of the transaction (and date on which the threshold is 22 November 2007 crossed or reached if different): 6. Date on which issuer notified: 23 November 2007 7. Threshold(s) that is/are crossed or reached: Above 5% (Group) Above 5% (LGIM) 8. Notified details: A: Voting rights attached to shares Class/type of Situation previous to the Resulting situation after the triggering transaction shares Triggering transaction if possible Number of Number of Number of Number of voting rights % of voting rights using the Shares Voting Rights shares ISIN CODE Direct Direct Indirect Direct Indirect ORD Below 5% 228,794,061 256,272,494 256,272,494 20,542,409 4.63 0.37 GBP0.25 B: Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration date Exercise/ Conversion Number of voting rights % of voting instrument Period/ Date that may be acquired if rights the instrument is exercised/ converted. Total (A+B) Number of voting rights % of voting rights 276,814,903 5.00 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: Legal & General Group Plc (Direct and Indirect) (Group) (276,814,903 - 5.00% = Total Position) Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect) (276,814,903 - 5.00% = Total Position) Legal & General Investment Management Limited (Indirect) (LGIM) (276,814,903 - 5.00% = Total Position) Legal & General Group Plc (Direct) (L&G) (256,272,494 - 4.63% = LGAS, LGPL & PMC) Legal & General Investment Management (Holdings) Limited Legal & General Insurance Holdings Limited (Direct) (Direct) (LGIMHD) (206,140,317 -3.72 % = PMC) (LGIH) Legal & General Assurance (Pensions Management) Limited (PMC) Legal & General Assurance Society Limited (LGAS & (206,140,317 -3.72 % = PMC) LGPL) Legal & General Pensions Limited (Direct) (LGPL) Proxy Voting: 10. Name of the proxy holder: N/A 11. Number of voting rights proxy holder will cease to hold: N/A 12. Date on which proxy holder will cease to hold voting rights: N/A 13. Additional information: Notification using the total voting rights figure of 5,529,026,383 14. Contact name: Helen Lewis (LGIM) 15. Contact telephone number: 020 3124 3851 This information is provided by RNS The company news service from the London Stock Exchange BFTMMJTBBR

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