Holding(s) in Company

GlaxoSmithKline PLC
15 June 2007



GlaxoSmithKline plc received on 14 June 2007 from Legal & General Group Plc a
notification of interests in GlaxoSmithKline plc ordinary shares of 25 pence
each dated 13 June 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 (L&G)
obligation:


4. Full name of shareholder(s) (if different from 3.):            Legal & General Assurance (Pensions
                                                                    Management) Limited  (PMC)


5. Date of the transaction (and date on which the threshold is                13/06/2007
crossed or reached if different):


6. Date on which issuer notified:                                             14/06/2007


7. Threshold(s) that is/are crossed or reached:                            From 3% - 4%(L&G)



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 GBP 0.25  218,457,607 218,457,607  228,794,061   228,794,061              4.00



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

228,794,061                                        4.00




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)


Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct
and Indirect)


Legal & General Investment Management Limited (Indirect) (LGIM)


Legal & General Group Plc (Direct) (L&G) (228,794,061 - 4.00% = LGAS, LGPL & PMC)


Legal & General Investment Management (Holdings) Limited       Legal & General Insurance Holdings Limited (Direct)
(Direct) (LGIMHD) (177,976,339 - 3.11%= PMC)                   (LGIH)


Legal & General Assurance (Pensions Management) Limited  (PMC) Legal & General Assurance Society Limited  (LGAS & LGPL)
    (177,976,339 - 3.11%= 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
                                                                      5,706,694,635


14. Contact name:                            N/A


15. Contact telephone number:                N/A




Annex Notification Of Major Interests In Shares

A: Identity of the person or legal entity subject to the notification obligation


Full name (including legal form for legal entities)        Legal & General Group Plc (L&G)


Contact address (registered office for legal entities)     Temple Court, 11 Queen Victoria Street, London,
                                                           EC4N 4TP


Phone number                                               020 7528 6000


Other useful information (at least legal representative    N/A
for legal persons)



B:        Identity of the notifier, if applicable

Full name                                                  Simon Bicknell


Contact address                                            GlaxoSmithKline Plc
                                                           980 Great West Road
                                                           Brentford
                                                           TW8 9GS
                                                           020 8047 6280


Phone number                                               020 8047 6280



Other useful information (e.g. functional relationship     Company Secretary
with the person or legal entity subject to the
notification obligation)




C:        Additional information

N/A



Notes

1.        This form is to be sent to the issuer or underlying issuer and to be
filed with the competent authority.

2.        Either the full name of the legal entity or another method for
identifying the issuer or underlying issuer, provided it is reliable and
accurate.

3.        This should be the full name of (a) the shareholder; (b) the person
acquiring, disposing of or exercising voting rights in the cases provided for in
DTR5.2.1 (b) to (h);  (c) all the parties to the agreement referred to in
DTR5.2.1 (a), or (d) the direct or indirect holder of financial instruments
entitled to acquire shares already issued to which voting rights are attached,
as appropriate.

In relation to the transactions referred to in points DTR5.2.1 (b) to (h), the
following list is provided as indication of the persons who should be mentioned:

-               in the circumstances foreseen in  DTR5.2.1 (b), the person that
acquires the voting rights and is entitled to exercise them under the agreement
and the natural person or legal entity who is transferring temporarily for
consideration the voting rights;

-               in the circumstances foreseen in DTR 5.2.1 (c), the person
holding the collateral, provided the  collateral under these conditions;

-               in the circumstances foreseen in DTR5.2.1(d), the person who has
a life interest in shares if that person is entitled to exercise the voting
rights attached to the shares and the person who is disposing of the voting
rights when the life interest is created;

-               in the circumstances foreseen in DTR5.2.1 (e), the parent
undertaking and, provided it has a notification duty at an individual level
under DTR 5.1, under DTR5.2.1 (a) to (d) or under a combination of any of those
situations, the controlled undertaking;

-               in the circumstances foreseen in DTR5.2.1 (f), the deposit taker
of the shares, if he can exercise the voting rights attached to the shares
deposited with him at his discretion, and the depositor of the shares allowing
the deposit taker to exercise the voting rights at his discretion;

-               in the circumstances foreseen in DTR5.2.1 (g), the person  that
controls the voting rights;

-               in the circumstances foreseen in DTR5.2.1 (h), the proxy holder,
if he can exercise the voting rights at his discretion, and the shareholder who
has given his proxy to the proxy holder allowing the latter to exercise the
voting rights at his discretion.

4.              Applicable in the cases provided for in DTR 5.2.1 (b) to (h).
This should be the full name of the shareholder or holder of financial
instruments who is the counterparty to the natural person or legal entity
referred to in DTR5.2.

5.             The date of the transaction should normally be, in the case of an
on exchange transaction, the date on which the matching of orders occurs; in the
case of an off exchange transaction, date of the entering into an agreement.

The date on which threshold is crossed should normally be the date on which the
acquisition, disposal or possibility to exercise voting rights takes effect (see
DTR 5.1.1R (3)). For passive crossings, the date when the corporate event took
effect.(DEL: :DEL)

These dates will usually be the same unless the transaction is subject to a
condition beyond the control of the parties.

6.             Please refer to the situation disclosed in the previous
notification, In case the situation previous to the triggering transaction was
below 3%, please state 'below 3%'.

7.                     If the holding has fallen below the minimum threshold ,
the notifying party should not be obliged to disclose the extent of the holding,
only that the new holding is less than 3%.

For the case provided for in DTR5.2.1(a), there should be no disclosure of
individual holdings per party to the agreement unless a party individually
crosses or reaches an Article 9 threshold. This applies upon entering into,
introducing changes to or terminating an agreement.

8.                     Direct and indirect

9.                     In case of combined holdings of shares with voting rights
attached 'direct holding' and voting rights 'indirect holdings', please split
the voting rights number and percentage into the direct and indirect columns-if
there is no combined holdings, please leave the relevant box blank.

10.                   Voting rights attached to shares in respect of which the
notifying party is a direct shareholder  (DTR 5.1)

11.                   Voting rights held by the notifying party as an indirect
shareholder (DTR 5.2.1)

12.             If the holding has fallen below the minimum threshold, the
notifying party should not be obliged to disclose the extent of the holding,
only that the new holding is below 3%.

13.             date of maturity / expiration of the finical instrument i.e. the
date when the right to acquire shares ends.

14.                   If the financial instrument has such a period-please
specify the period- for example once every three months starting from the (date)

15.                   The notification should include the name(s) of the
controlled undertakings through which the voting rights are held. The
notification should also include the amount of voting rights and the percentage
held by each controlled undertaking, insofar as individually the controlled
undertaking holds 3% or more, and insofar as the notification by the parent
undertaking is intended to cover the notification obligations of the controlled
undertaking.

16.                   This annex is only to be filed with the competent
authority.

17.                   Whenever another person makes the notification on behalf
of the shareholder or the natural person/legal entity  referred to in DTR5.2 and
DTR5.3.


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