Director/PDMR Shareholding

1.

Details of PDMR/person closely associated with them ('PCA')

a)

Name

Dr S Dexter

b)

Position/status

PCA of Dr P J T Vallance (President, R&D)

c)

Initial notification/

amendment

Initial notification

2.

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

GlaxoSmithKline plc

b)

LEI

5493000HZTVUYLO1D793

3.

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted

a)

Description of the financial  instrument

Ordinary shares of 25 pence each ('Ordinary Shares')

ISIN: GB0009252882

b)

Nature of the transaction

Acquisition of Ordinary Shares following the re-investment of dividends paid to shareholders on 12 January 2017.

c)

Price(s) and volume(s)

d)

Aggregated information

Aggregated volume Price

n/a (single transaction)

e)

Date of the transaction

2017-01-16

f)

Place of the transaction

London Stock Exchange (XLON)