GlaxoSmithKline plc received on 21 August 2009 from Legal & General Group plc a notification of interests in GlaxoSmithKline plc Ordinary shares of 25 pence each, dated on 19 August 2009. This notice is given in accordance with DTR 5.8.12.

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer
of existing shares to which voting rights are
attached:

GlaxoSmithKline Plc

2. Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

Yes

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached.

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to the
notification obligation:

Legal & General Group Plc (Group)
 
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 crossed or
reached:

19 August 2009

6. Date on which issuer notified:

21 August 2009

7. Threshold(s) that is/are crossed or
reached:

Below 5% (Group)
 
Below 5% (LGIM)

8. Notified details:

A: Voting rights attached to shares

Class/type of
shares

if possible using
the ISIN CODE

Situation previous
to the triggering
transaction

Resulting situation after the triggering transaction

Number
of
Shares

Number
of
Voting
Rights

Number
of shares

Number of voting
rights

% of voting rights

Direct

Indirect

Direct

Indirect

ORD
GBP 0.25

260,231,752

260,231,752

Below 5%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial
instrument

Expiration
date

Exercise/
Conversion Period

Number of voting
rights that may be
acquired if the
instrument is
exercised/ converted.

% of voting
rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial
instrument

Exercise price

Expiration date

Exercise/
Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

Below 5%

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) (Below 5%)
 
Legal & General Investment Management (Holdings) Limited (LGIMH)
(Direct and Indirect) (Below 5%)

Legal & General Investment Management Limited (Indirect) (LGIM) (Below 5%)
 

Legal & General Group Plc (Direct) (L&G) (234,245,526 – 4.51% = LGAS, LGPL & PMC)
 

Legal & General Investment Management (Holdings)                  Legal & General Insurance Holdings Limited
Limited (Direct) (LGIMHD) (195,647,164 – 3.77% = PMC)             (Direct) (LGIH)
 
Legal & General Assurance (Pensions Management) Limited    Legal & General Assurance Society Limited
(PMC) (195,647,164 – 3.77% = PMC)                                                (LGAS & 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 5,188,446,713

14. Contact name:

Helen Lewis (LGIM)

15. Contact telephone number:

020 3124 3851