GlaxoSmithKline plc : Director/PDMR Shareholding

Notification of Transactions of Directors, Persons Discharging

Managerial Responsibility or Connected Persons

This announcement supplements the announcements released on 7 October 2011 at 18.10 (RNS No: 8358P) and 11 July 2011 at 18.01 (RNS No: 1910K).

The Administrators of the GlaxoSmithKline 2009 Deferred Annual Bonus Plan (the "Plan") notified the Company and the under-mentioned persons on 7 October 2011 and on 11 July 2011 of an increase in their notional interests in Ordinary shares and ADRs following the reinvestment of dividends paid to shareholders on 6 October 2011 and 7 July 2011 respectively.

PDMR	Number of Ordinary shares acquired on 7th July 2011 at a price of 1359.50 pence per Ordinary share			Number of Ordinary shares acquired on 6th October 2011 at a price of 1345 pence per Ordinary share
	Personal Element	Matching Element		Personal Element	Matching Element
Sir Andrew Witty	301	301		308	308
Mr S M Bicknell	79	79		-	-
Mr D S Redfern	89	89		-	-
Ms C Thomas	19	19		-	-
Dr P J T Vallance	177	177		-	-
	Number of ADRs acquired on 7th July 2011 at a price of $43.59 per ADR			Number of ADRs acquired on 6th October 2011 at a price of $41.83 per ADR
	Personal Element		Matching Element	Personal Element	Matching Element
Mrs D P Connelly	45		45	-	-
Dr M M Slaoui	226		226	-	-
Mr D E Troy	113		113	-	-

The notional dividends accrued will be paid out in proportion to the percentage of the participant's deferred annual bonus holdings that will vest following the end of the relevant three year measurement period.

This notification relates to a transaction notified in accordance with Disclosure and Transparency Rule 3.1.4R(1)(a).

V A Whyte

Company Secretary

16 January 2012