GlaxoSmithKline plc received on 2 August 2010 from Legal & General Group plc a notification of interests in GlaxoSmithKline plc Ordinary shares of 25 pence each, dated on 2 August 2010. 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 (L&G)

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 crossed or reached:

30 July 2010

6. Date on which issuer notified:

02 August 2010

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

From 4% to 3%

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

Ordinary 25p

234,245,526
 

(As on 21/08/2009)

207,179,146

207,179,146

3.98%

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

207,179,146

3.98%

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) ( 207,179,146 - 3.98%=LGAS, LGPL & PMC)

   Legal & General Investment Management (Holdings) Limited               Legal & General Insurance Holdings Limited  (Direct)
   (Direct) (LGIMHD) ( 173,376,830 – 3.33%= PMC) (LGIH)

 

   Legal & General Assurance (Pensions Management) Limited                Legal & General Assurance Society Limited (LGAS &
   (PMC) ( 173,376,830 – 3.33%= 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 5,192,618,078

14. Contact name:

Wayne Powell (LGIM)

15. Contact telephone number:

020 3124 3851