Director/PDMR Shareholding

1.

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

a)

Name

Dr K Slaoui

b)

Position/status

PCA of Dr M M Slaoui (Chairman, Global Vaccines)

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

GlaxoSmithKline plc American Depositary Shares ('ADSs')

ISIN: US37733W1053

b)

Nature of the transaction

An increase of 1 ADS following the notional allocation of ADSs on 22 July 2016, at a price of $43.88 per ADS, as a result of the revaluation of the cash element of the notional investment held within the GSK 401(K) plan.

c)

Price(s) and

volume(s)

d)

Aggregated information

Aggregated volume Price

n/a (single transaction)

e)

Date of the transaction

2016-07-22

f)

Place of the transaction

n/a