Director/PDMR Shareholding

1.

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

a)

Name

Mr J Ford

b)

Position/status

SVP & General Counsel

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

American Depositary Shares ('ADSs')

ISIN: US37733W1053

b)

Nature of the transaction

Acquisition of ADSs following the re-investment of dividends paid to shareholders on 8 April 2021

c)

Price(s) and volume(s)

Price(s)

Volume(s)

$38.0538

152.309

d)

Aggregated information

N/A (single transaction)

Aggregated volume Price

e)

Date of the transaction

2021-04-15

f)

Place of the transaction

New York Stock Exchange (XNYS)

1.

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

a)

Name

Mr B McNamara

b)

Position/status

CEO, GSK Consumer Healthcare

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

American Depositary Shares ('ADSs')

ISIN: US37733W1053

b)

Nature of the transaction

Acquisition of ADSs following the re-investment of dividends paid to shareholders on 8 April 2021

c)

Price(s) and volume(s)

Price(s)

Volume(s)

$38.0538

2,101.593

d)

Aggregated information

N/A (single transaction)

Aggregated volume Price

e)

Date of the transaction

2021-04-15

f)

Place of the transaction

New York Stock Exchange (XNYS)

1.

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

a)

Name

Ms K Terrell

b)

Position/status

Chief Digital & Technology Officer

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

American Depositary Shares ('ADSs')

ISIN: US37733W1053

b)

Nature of the transaction

Acquisition of ADSs following the re-investment of dividends paid to shareholders on 8 April 2021

c)

Price(s) and volume(s)

Price(s)

Volume(s)

$38.0538

699.728

d)

Aggregated information

N/A (single transaction)

Aggregated volume Price

e)

Date of the transaction

2021-04-15

f)

Place of the transaction

New York Stock Exchange (XNYS)

1.

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

a)

Name

Dr H Barron

b)

Position/status

Chief Scientific Officer and 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

American Depositary Shares ('ADSs')

ISIN: US37733W1053

b)

Nature of the transaction

Acquisition of ADSs following the re-investment of dividends paid to shareholders on 8 April 2021

c)

Price(s) and volume(s)

Price(s)

Volume(s)

$38.0538

1,553.779

d)

Aggregated information

N/A (single transaction)

Aggregated volume Price

e)

Date of the transaction

2021-04-15

f)

Place of the transaction

New York Stock Exchange (XNYS)