Director/PDMR Shareholding

1.

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

a)

Name

Mrs V A Whyte

b)

Position/status

Company Secretary

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

A conditional award of Ordinary Shares under the Company's 2017 Performance Share Plan. Vesting of the award is subject to meeting performance criteria over a three-year period.

c)

Price(s) and

volume(s)

Price(s)

Volume(s)

£12.908

11,800

d)

Aggregated information

n/a (single transaction)

Aggregated volume Price

e)

Date of the transaction

2018-02-14

f)

Place of the transaction

n/a