Holding(s) in Company

GlaxoSmithKline PLC
18 December 2007


GlaxoSmithKline plc received on 17 December 2007 from Legal & General Group plc a notification of interests in
GlaxoSmithKline plc Ordinary shares of 25 pence each, dated 17 December 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             12 December 2007
crossed or reached if different):
6. Date on which issuer notified:                                          17 December 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 Resulting situation after the triggering transaction
shares        the Triggering
              transaction
 if possible  Number of  Number of  Number of       Number of voting rights   % of voting rights
using the     Shares     Voting     shares
ISIN CODE                Rights     Direct          Direct       Indirect     Direct       Indirect
ORD                 Below 5%        262,702,444     262,702,444  21,129,709   4.769        0.383

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
                   
283,832,153                                              5.15





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) (283,832,153 -
5.15% = Total Position)
Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct
and Indirect)  (283,832,153 - 5.15% = Total Position)
Legal & General Investment Management Limited (Indirect) (LGIM)
(283,832,153 - 5.15% = Total Position)
                  Legal & General Group Plc (Direct) (L&G) (262,702,444 - 4.76 % = LGAS, LGPL & PMC)
Legal & General Investment Management (Holdings) Limited       Legal & General Insurance Holdings Limited (Direct)
(Direct) (LGIMHD) (213,985,881 -3.88 % = PMC)                  (LGIH)
Legal & General Assurance (Pensions Management) Limited  (PMC) Legal & General Assurance Society Limited  (LGAS & LGPL)
(213,985,881 -3.88 % = PMC)
                                                               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
                                                                      5,507,831,537

                                             Please note this notification has been delayed due to the large
                                             number of disclosures required following a substantial amount of
                                              new business which has come to us in the form of an in-specie
                                                                        transfer.
14. Contact name:                                                   Helen Lewis (LGIM)
15. Contact telephone number:                                         020 3124 3851




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