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GlaxoSmithKline PLC Regulatory Filings 2012

May 2, 2012

5262_ffr_2012-05-02_f5d6b50a-285a-4075-aec5-eaf98503b02a.zip

Regulatory Filings

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

May 2, 2012

GlaxoSmithKline plc

(Name of registrant)

980 Great West Road,

Brentford,

Middlesex, TW8 9GS

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes ¨ No x

THIS REPORT ON FORM 6-K SHALL BE DEEMED TO BE INCORPORATED BY REFERENCE IN THE PROSPECTUS INCLUDED IN THE REGISTRATION STATEMENT ON FORM F-3 (FILE NO. 333-172621) OF GLAXOSMITHKLINE PLC, GLAXOSMITHKLINE CAPITAL INC. AND GLAXOSMITHKLINE CAPITAL PLC AND TO BE A PART THEREOF FROM THE DATE ON WHICH THIS REPORT IS FURNISHED, TO THE EXTENT NOT SUPERSEDED BY DOCUMENTS OR REPORTS SUBSEQUENTLY FILED OR FURNISHED.

GlaxoSmithKline plc

Results Announcement for the first quarter 2012

GlaxoSmithKline (GSK) together with its subsidiary undertakings, the ‘Group’ – one of the world’s leading research-based pharmaceutical and healthcare companies – is committed to improving the quality of human life by enabling people to do more, feel better and live longer. GlaxoSmithKline’s website www.gsk.com gives additional information on the Group. Information made available on the website does not constitute part of this document.

Exchange rates

The Group operates in many countries and earn revenues and incur costs in many currencies. The results of the Group, as reported in Sterling, are affected by movements in exchange rates between Sterling and other currencies. Average exchange rates, as modified by specific transaction rates for large transactions, prevailing during the period are used to translate the results and cash flows of overseas subsidiaries, associates and joint ventures into Sterling. Period-end rates are used to translate the net assets of those entities. The currencies which most influenced these translations were the US Dollar, the Euro and the Japanese Yen.

Core results

Core results exclude the following items from total results: amortisation and impairment of intangible assets (excluding computer software) and goodwill; major restructuring costs; legal charges (net of insurance recoveries) on the settlement of litigation and government investigations; other operating income other than royalty income; disposals of associates, products and businesses, and acquisition accounting adjustments for material acquisitions, together with the tax effects of these items. GSK believes this approach provides a clearer view of the underlying performance of the core business and should make the Group’s results more comparable with the majority of its peers. Reconciliations of core results to total results are set out in ‘Unaudited core results reconciliations’ on page 25.

CER growth

In order to illustrate underlying performance, it is our practice to discuss our results in terms of constant exchange rate (CER) growth. This represents growth calculated as if the exchange rates used to determine the results of overseas companies in Sterling had remained unchanged from those used in the comparative period. All commentaries are presented in terms of CER growth, unless otherwise stated.

Brand names and partner acknowledgements

Brand names appearing in italics throughout this document are trademarks of GSK or associated companies or used under licence by the Group.

Cautionary statement regarding forward-looking statements

Under the safe harbor provisions of the US Private Securities Litigation Reform Act of 1995, the company cautions investors that any forward-looking statements or projections made by the company, including those made in this Announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Factors that may affect the Group’s operations are described in ‘Cautionary statement regarding forward-looking statements’ on page 27.

The following are extracts from recent London Stock Exchange Announcements and general press releases issued by GSK:

Issued as a Stock Exchange Announcement: Thursday 19 April 2012, London UK

GlaxoSmithKline plc (LSE: GSK) today confirms that it made an offer to the Board of Directors of Human Genome Sciences (HGS, NASDAQ: HGSI) on 11 April proposing to acquire all of the outstanding shares of HGS for US$13.00 per share in cash, representing a 81 percent premium to yesterday’s closing share price.

Issued as a press release: Thursday 26 April 2012, Philadelphia

GlaxoSmithKline plc (GSK) announced today that the U.S. Food and Drug Administration (FDA) has approved Votrient (pazopanib) for the treatment of patients with advanced soft tissue sarcoma who have received prior chemotherapy. The U.S. label contains the following limitations: The efficacy of Votrient for the treatment of patients with adipocytic STS or gastrointestinal stromal tumors has not been demonstrated.

Issued as a press release: Friday 27 April 2012, London UK

GlaxoSmithKline plc (GSK) announced today that the European Commission has granted marketing authorisation for Nimenrix (Meningococcal group A, C, W-135 and Y conjugate vaccine) for active immunisation against invasive meningococcal disease caused by Neisseria meningitidis serogroups A, C, W-135 and Y.

1

Group turnover review

£m Growth CER%
Pharmaceuticals 4,546 2
Vaccines 758 1
Pharmaceuticals and Vaccines 5,304 2
Consumer Healthcare 1,336 1
6,640 2
Q1 2012
£m Growth CER%
Pharmaceuticals and Vaccines
– US 1,784 9
– Europe 1,295 (6 )
– EMAP 1,052 2
– Japan 549 4
– ViiV Healthcare 334 (5 )
– Other trading and unallocated pharmaceuticals 290 (5 )
Pharmaceuticals and Vaccines 5,304 2
Consumer Healthcare 1,336 1
6,640 2

Total Group turnover for Q1 2012 increased 2%, to £6,640 million. Pharmaceuticals turnover was up 2% primarily reflecting continued pressure from the implementation of government austerity measures in Europe as well as slower growth in Emerging Markets/Asia Pacific (‘EMAP’) driven particularly by continued disruption in the Middle East, but also some broader sensitivity to a more challenging economic environment in a number of EMAP markets. Vaccines was also impacted by similar pressures in Europe and EMAP as well as phasing of tenders and a demanding comparator. Consumer Healthcare turnover increased 1% to £1,336 million. Excluding the non-core OTC brands identified in 2011 for divestment, turnover increased 7%, reflecting growth across all categories and regions.

In the US, Pharmaceuticals and Vaccines turnover growth was 9%. Pharmaceuticals turnover growth reflected incremental revenue related to the conclusion of the co-promotion agreement for Vesicare together with growth in Advair and Lamictal as well as an encouraging performance from new products, particularly in oncology. Turnover growth was adversely impacted by the decline of a number of older, genericised products and the loss of Zovirax sales following disposal of the North American rights in Q1 2011. Sales of Vaccines in the US were down 6%, in part reflecting variations in the timing of vaccine shipments and an adverse comparison with Q1 2011 which included a CDC stockpile order that did not recur this quarter.

Europe Pharmaceuticals and Vaccines markets remained challenging and despite good progress on new launches in a number of therapeutic areas, particularly cardiovascular/urogenital and oncology, turnover declined 6% primarily reflecting the impact of price cuts, which lowered sales by approximately 4.5 percentage points. Sales in the region were also impacted by generic competition to older products and a mild flu season. Vaccines sales continued to be affected by austerity measures as well as tender phasing in the quarter and declined 3% to £225 million.

EMAP also saw some pricing pressures but sales were most significantly affected by ongoing instability in the Middle East/Africa region (£267 million, -6%) and the phasing of vaccine tenders. Pharmaceuticals grew 6% primarily reflecting stronger growth in respiratory sales as prior year price cuts annualised, offset by weaker sales of anti-bacterials, which were impacted by a mild flu season and also the effect of stocking patterns following supply interruptions in late 2011. Vaccines declined 9% as a result of the expected adverse comparison with Q1 2011, which benefited from strong tender shipments.

2

Overall, Pharmaceuticals and Vaccines sales in the region rose 2%, with growth generated across a broad number of markets and businesses.

Japan Pharmaceuticals and Vaccines turnover grew 4%, with a strong contribution from Cervarix and an encouraging performance from a number of new products including Lamictal , Avodart and Promacta. Respiratory products fell 7% primarily reflecting comparison with a particularly strong allergy season in Q1 2011.

ViiV Healthcare turnover declined by 5% as the effect of recent launches of generic competitors in the US to Combivir and Epivir offset the growth of newer products.

Consumer Healthcare turnover grew 1% in the quarter, but excluding the sales of the non-core OTC brands identified in 2011 for disposal, Consumer Healthcare turnover increased 7%. This reflected continued strong contributions from Oral care (up 11%) and Nutrition (up 11%), together with an improved performance from Wellness (up 4%). On a regional basis, ongoing growth was broadly based with contributions from each of the US (up 8%), Europe (up 4%) and Rest of World (up 10%).

Pharmaceutical turnover

£m CER%
Respiratory 1,841 1
Anti-virals 184 (18 )
Central nervous system 401 1
Cardiovascular and urogenital 728 34
Metabolic 33 (60 )
Anti-bacterials 318 (14 )
Oncology and emesis 179 22
Dermatology 213 1
Rare diseases 106 (5 )
ViiV Healthcare (HIV) 334 (5 )
Other 209 (2 )
4,546 2

Respiratory

Q1 2012 (£1,841 million; +1%)

In the quarter, Respiratory sales increased 1%, as growth in the US and EMAP offset declines in Europe and Japan. Seretide/Advair sales increased 2%, primarily as a result of the 6% growth in the US. In addition, Xyzal sales, almost exclusively in Japan, more than doubled to £36 million. Ventolin sales increased 6% to £155 million but Zyrtec declined 26% to £24 million (Q1 2011 sales in Japan reflected a strong allergy season).

In the US, reported sales of Advair increased 6% to £630 million benefiting from variations in wholesaler and retailer stocking patterns. Adjusting for these, sales for the quarter grew approximately 2% (7% volume decline offset by 9% positive impact of price and mix). Flovent , the leading single agent inhaled corticosteroid in the US market, grew 5% to £113 million.

The ICS/LABA combination market in the US (which includes Advair ) declined approximately 2% in Q1 2012 compared with Q1 2011, which was caused in part by the FDA labelling change, implemented in 2010, required for all ICS/LABA combinations. Overall, the company has maintained its clear leadership position in the overall ‘controller’ class (LABA, ICS and anti-cholinergic products) despite new competition (combined market share of Advair and Flovent 49% in Q1 2012 compared with 52% in Q1 2011). Overall prescription volume in the controller class was flat in the quarter compared with Q1 2011. (All market growth and share data based on IMS Health data).

In the US, Respiratory sales also benefited from the strong performance of Ventolin , up 23% to £69 million. Reported growth in Q1 2012 reflected the impact of variations in wholesaler and retailer stocking patterns. Excluding this, sales for the quarter grew approximately 12% (4% volume plus 8% positive impact of price and mix).

3

European Respiratory sales were down 4% in the quarter reflecting the impact of price cuts as well as a relatively mild flu season. Seretide sales were down 4% to £375 million, reflecting the impact of price cuts.

In EMAP, Respiratory sales grew 9% in the quarter, with growth across most products in the portfolio. Seretide grew 9% to £98 million in the region with strong volume growth in many markets.

Anti-virals

Q1 2012 (£184 million; -18%)

Valtrex sales continued to decline (down 32% to £63 million) as a result of generic competition in the US and Europe. In addition, Zovirax sales were down 33% compared with Q1 2011 to £24 million, following disposal of the brand in North America in Q1 2011.

Central nervous system

Q1 2012 (£401 million; +1%)

In Central nervous system, strong growth of Lamictal (up 29% to £148 million), principally in the US and Japan, was offset by declines in a number of older generic products, but primarily Seroxat/Paxil (down 15% to £91 million).

Cardiovascular and urogenital

Q1 2012 (£728 million; +34%)

In the quarter, Cardiovascular and urogenital primarily benefited from incremental revenue related to the conclusion of the co-promotion agreement for Vesicare in the US (Q1 2012: £174 million, Q1 2011: £28 million) although there was also strong growth from Avodart , Lovaza and Levitra . The Avodart franchise grew 11% to £186 million in the quarter with growth driven by a strong contribution from the recent launch of the new combination product Duodart/Jalyn in Europe and of Avodart in EMAP and Japan. Lovaza grew 17% to £151 million, while Levitra sales more than doubled in the quarter to £33 million as GSK assumed full promotional rights to the brand in the US during 2011. Arixtra sales declined 34% as a result of generic competition in the US which began in Q3 2011.

Metabolic

Q1 2012 (£33 million; -60%)

The decline in Metabolic sales reflected the ongoing loss of sales of Avandia .

Anti-bacterials

Q1 2012 (£318 million; -14%)

Anti-bacterial sales declined in all segments in the quarter, partly as a result of a mild flu season but also due to the impact of some supply interruptions and stocking patterns in Q4 2011. Price cuts impacted the portfolio in Europe.

Oncology and emesis

Q1 2012 (£179 million; +22%)

Sales of new products Votrient, Promacta/Revolade and Arzerra together more than doubled to £72 million in the quarter, with growth in each of the US, Europe and EMAP.

Tykerb/Tyverb sales increased 15% to £60 million with strong growth in both the US and EMAP. Growth from new products and Tykerb was partly offset by the impact of generic competition to older products, including Hycamtin in Europe.

Dermatology

Q1 2012 (£213 million; +1%)

Sales growth in Europe and EMAP was offset by lower sales in the US, which in part reflected the impact of generic competition to Evoclin .

Rare diseases

Q1 2012 (£106 million; -5%)

A 26% decline in sales of Flolan , primarily in Europe, to £35 million was partly offset by growth of 27% in sales of Volibris .

4

ViiV Healthcare (HIV)

Q1 2012 (£334 million; -5%)

ViiV Healthcare sales declined by 5%, with the US down 11%, Europe down 2%, and EMAP up 12%. Sales growth in Epzicom/Kivexa (up 14% to £159 million) and Selzentry (up 26% to £29 million) were more than offset by a 23% decline in the mature portfolio, primarily as a result of generic competition in the US to Combivir and Epivir . The Epzicom/Kivexa sales growth reflects strong performances in both the US and Europe.

Vaccines turnover

£m CER%
Total Vaccines sales 758 1

Q1 2012 (£758 million, +1%)

The performance of Vaccines in the quarter reflected pressure from the implementation of government austerity measures in Europe and disruption in the Middle East, as well as phasing of tenders and a demanding comparator.

Cervarix sales continued to grow (up 17% to £131 million) with a particularly strong contribution from Japan, where sales increased 36% to £100 million reflecting the final stage of the catch-up vaccination programme started last year.

Boostrix sales increased 47% to £47 million, with growth in all the regions where it has been launched. In the US (up 40% to £21 million) the product is benefiting from being the only vaccine for use in adults of 65 and older for active immunisation against tetanus, diphtheria and whooping cough.

Sales of hepatitis vaccines declined in the US (down 11% to £63 million) due to reduced public funding of adult hepatitis vaccines and the return to the market of a previously out-of-stock competitor. Europe hepatitis vaccines sales were down 7% to £48 million, due in part to government austerity measures. Sales of hepatitis vaccines in EMAP grew 44% to £25 million.

Synflorix sales fell 3% to £73 million as a result of tender phasing in both Europe and EMAP.

Rotarix sales fell 1% to £76 million as a result of variations in customer buying patterns in the US and EMAP. Rotarix achieved sales in Japan of £7 million in the quarter following its recent launch.

Sales from new pharmaceutical and vaccine launches

£m CER%
Arzerra 12 33
Benlysta 9 —
Duodart/Jalyn 34 >100
Lamictal XR 34 48
Potiga/Trobalt 1 —
Prolia 5 >100
Promacta 27 >100
Requip XL 28 (15 )
Synflorix 73 (3 )
Treximet 12 (14 )
Volibris 28 27
Votrient 33 100
Others 4
300 31

5

New products are those launched in the last five years (2008 to 2012 inclusive). Since the Q4 2011 Preliminary Announcement, products launched in 2007 have been removed from the list. Total sales of new products were £300 million, grew 31% in Q1 2012 and represented 6% of Pharmaceuticals and Vaccines turnover.

Benlysta for lupus has now been launched in the US and most European markets. GSK turnover of £9 million in the quarter reflects the share of gross profit in the US and total sales in all other markets.

Trobalt as an adjunctive (add-on) treatment of partial onset seizures continues to be launched throughout Europe (£1 million). The product has been approved by the FDA under the brand name of Potiga , and following the FDA recommended scheduling by the US Drug Enforcement Administration, will be launched in late April.

6

Unaudited Pharmaceuticals and Vaccines turnover

Three months ended 31 March 2012

£m CER% £m CER% £m CER% £m CER% £m CER%
Respiratory 1,841 1 848 6 501 (4 ) 198 9 294 (6 )
Avamys / Veramyst 69 (4 ) 14 (7 ) 17 6 13 30 25 (19 )
Flixonase/Flonase 42 (13 ) 7 >100 8 — 11 10 16 (42 )
Flixotide/Flovent 199 (2 ) 113 5 34 (10 ) 13 (13 ) 39 (8 )
Seretide/Advair 1,252 2 630 6 375 (4 ) 98 9 149 (1 )
Serevent 38 (27 ) 13 (38 ) 17 (18 ) 1 (50 ) 7 (14 )
Ventolin 155 6 69 23 33 (6 ) 41 8 12 (33 )
Xyzal 36 >100 — — — — 4 33 32 >100
Zyrtec 24 (26 ) — — — — 9 29 15 (42 )
Anti-virals 184 (18 ) 11 (70 ) 22 (12 ) 85 8 66 (21 )
Hepsera 29 — — — — — 22 — 7 —
Zovirax 24 (33 ) 1 (91 ) 6 (14 ) 9 29 8 (27 )
Valtrex 63 (32 ) 7 (68 ) 10 (8 ) 8 — 38 (27 )
Zeffix 58 — 2 (50 ) 5 (17 ) 45 8 6 —
Central nervous system 401 1 124 19 102 (13 ) 74 — 101 (1 )
Imigran/Imitrex 44 (14 ) 15 (29 ) 17 6 1 (50 ) 11 (9 )
Lamictal 148 29 84 57 29 (9 ) 17 (6 ) 18 70
Requip 45 (13 ) 9 (10 ) 21 (30 ) 3 — 12 30
Seroxat/Paxil 91 (15 ) — (100 ) 14 (6 ) 20 (13 ) 57 (16 )
Treximet 12 (14 ) 12 (14 ) — — — — — —
Wellbutrin 20 5 4 33 10 10 6 40 — <100
Cardiovascular and urogenital 728 34 492 46 131 7 68 26 37 29
Arixtra 48 (34 ) 16 (64 ) 24 4 6 50 2 —
Avodart 186 11 76 (1 ) 55 14 20 40 35 28
Coreg 35 (8 ) 35 (8 ) — — — — — —
Fraxiparine 61 15 — — 41 10 20 33 — —
Lovaza 151 17 150 17 — — — — 1 —
Vesicare 174 >100 174 >100 — — — — — —
Metabolic 33 (60 ) (12 ) <(100 ) 6 (53 ) 15 7 24 (18 )
Avandia products (8 ) <(100 ) (12 ) <(100 ) — — 2 (50 ) 2 (67 )
Anti-bacterials 318 (14 ) 6 (68 ) 121 (19 ) 171 (2 ) 20 (25 )
Augmentin 153 (16 ) — (100 ) 62 (15 ) 83 (13 ) 8 (18 )
Oncology and emesis 179 22 70 19 62 14 29 67 18 6
Arzerra 12 33 9 29 3 — — — — 100
Promacta 27 >100 11 83 8 >100 2 — 6 >100
Tyverb/Tykerb 60 15 17 31 23 — 13 75 7 (29 )
Votrient 33 100 16 33 13 >100 4 — — —
Dermatology 213 1 59 (6 ) 39 5 95 11 20 (28 )
Bactroban 30 7 11 — 7 — 9 25 3 —
Duac 28 4 16 (6 ) 7 17 3 — 2 50
Rare diseases 106 (5 ) 22 (15 ) 32 (13 ) 9 (10 ) 43 11
Flolan 35 (26 ) 8 (20 ) 7 (50 ) — — 20 (13 )
Volibris 28 27 — — 18 12 2 — 8 >100
Other pharmaceuticals 209 — 16 >100 54 (11 ) 98 (7 ) 41 —
Benlysta 9 — 8 — 1 — — — — —
Vaccines 758 1 148 (6 ) 225 (3 ) 210 (9 ) 175 34
Boostrix 47 47 21 40 12 33 5 >100 9 50
Cervarix 131 17 1 — 14 — 13 (41 ) 103 38
Fluarix, FluLaval 7 (22 ) — (100 ) — — 4 (20 ) 3 —
Hepatitis 153 (3 ) 63 (11 ) 48 (7 ) 25 44 17 —
Infanrix, Pediarix 161 1 37 (8 ) 92 4 14 (22 ) 18 42
Rotarix 76 (1 ) 26 (7 ) 10 — 28 (24 ) 12 >100
Synflorix 73 (3 ) — — 9 (31 ) 61 (3 ) 3 >100
4,970 2 1,784 9 1,295 (6 ) 1,052 2 839 —
ViiV Healthcare (HIV) 334 (5 ) 138 (11 ) 138 (2 ) 28 12 30 —
Combivir 34 (51 ) 4 (87 ) 18 (33 ) 9 — 3 (20 )
Epivir 13 (50 ) 2 (82 ) 6 (33 ) 2 (33 ) 3 —
Epzicom/Kivexa 159 14 60 16 72 14 9 29 18 6
Lexiva 31 — 17 — 10 (17 ) 3 >100 1 —
Selzentry 29 26 13 30 14 17 — — 2 100
Trizivir 27 (10 ) 15 — 10 (15 ) — — 2 (50 )
5,304 2

7

Consumer Healthcare turnover

The Consumer Healthcare business recorded turnover growth of 1% in the quarter. Excluding the non-core OTC brands that were identified in 2011 for divestment, turnover grew 7% versus market growth of just under 4%.

The Group has now completed the sale of, or reached agreement to divest, non-core brands that had total 2011 sales of approximately £370 million. This includes the divestment of the North American brands (total 2011 sales of approximately £126 million) which was substantially completed at the end of January 2012 and the divestments expected to be completed in Q2 2012 of European brands (total 2011 sales of approximately £185 million) and international brands (total 2011 sales of approximately £60 million).

Wellness sales were down 8%, but excluding the non-core brands identified for divestment, the category gained 4%, driven by growth of 6% in gastrointestinal health products. The Panadol Pain business grew 3%, impacted by a relatively mild flu season. The smoking control franchise grew 3% behind strong lozenge growth in the US and Europe.

Oral care sales were up 11%. The Sensodyne Sensitivity and Acid Erosion business, up 22% to £186 million, continued its strong growth across all markets, driven by Sensodyne Repair and Protect and Sensodyne Pronamel. Sensodyne registered its twelfth consecutive quarter of double-digit sales growth.

Nutrition sales grew 11% in the quarter. Excluding the acquisition of Maxinutrition, which completed in Q1 2011, sales grew 9%. The category performance was driven by strong growth of 16% in developing markets, particularly of Horlicks in India (up 17%), combined with an improved performance from Lucozade (up 9%), which returned to growth in Europe and also had very strong growth in developing markets of 31%.

Skin health sales fell 6%, as growth of Zovirax OTC in Europe and Bactroban OTC in China was more than offset by reported declines of other brands, including Abreva , impacted by some stocking patterns, and Hinds , affected by competitor activity in Mexico.

Excluding the non-core brands, the US registered strong growth of 8% in the quarter, driven by Sensodyne and Tums. In Europe, sales declined 3%, but excluding the non-core brands grew 4%, driven by strong results in southern Europe (up 5%) and Central and Eastern Europe (up 5%). The Rest of World markets grew 10%, excluding the non-core OTC brands, with strong results from India, China, the Middle East and Africa and Japan.

The company continues to plan to divest alli . As previously stated, the process to divest alli has been delayed pending the resolution of a temporary third party supply interruption. No product was shipped in the quarter. Sales of alli in Q1 2011 and the full-year 2011 were £31 million and £93 million, respectively.

£m CER% Growth excluding non-core OTC products CER%
Turnover
Total wellness 539 (8 ) 4
Oral care 462 11 11
Nutrition 269 11 11
Skin health 66 (6 ) (6 )
Total 1,336 1
Turnover
US 229 (7 ) 8
Europe 467 (3 ) 4
ROW 640 8 10
Total 1,336 1

8

Phase III/Registration Pharmaceuticals and Vaccines pipeline update

The table below is provided as part of our quarterly update to show events and changes to the late-stage pipeline during the quarter and up to the date of this announcement. There were several news events for late-stage pipeline assets in this quarter and these are listed in the table below.

In February 2011, the following 15 assets were listed as expected to deliver Phase III data by the end of 2012: 2402968, 642444+573719 (LABA/LAMA), albiglutide, dabrafenib (BRAF, 2118436), dolutegravir, IPX066, MAGE-A3 (event driven), migalastat HCl, RTS,S, otelixizumab, Promacta , Relovair , trametinib (MEK, 1120212), Tykerb , Votrient.

Phase III data were announced during 2011 (up to Q4 results announcement in February 2012) from studies on IPX066, otelixizumab, Votrient, Promacta, Relovair, Mosquirix, Tykerb, albiglutide and trametinib.

Since Q4 2011 GSK has announced the following:

• seven of the eight ‘Harmony’ Phase III studies investigating the use of albiglutide in type 2 diabetes have reported in-house and the data support progression towards regulatory filing;

• dabrafenib (BRAF) BREAK-3 study data are in-house and sufficient to file;

• dolutegravir SPRING-2 study data, showing non-inferiority to raltegravir;

• completion of the Relovair registration programme and topline results from Relovair vs Advair Phase III studies in COPD.

Of the 15 assets with Phase III data expected by the end of 2012, eleven have now reported data. Five of the 15 assets have either filed or have sufficient data to file:

• Votrient sarcoma (filed);

• Relovair (asthma and COPD);

• Promacta Hep C;

• trametinib (MEK);

• dabrafenib (BRAF).

We have plans to begin a Phase III trial of the combination of MEK and BRAF in metastatic melanoma in the next few months.

Overall, by the end of 2012, GSK expects more than 15 further Phase III read-outs on the ongoing assets and expects Phase III registration programmes to complete for four further products and indications: LABA/LAMA, albiglutide, dolutegravir and Mosquirix . The MAGE-A3 studies are event driven and data are now expected in 2013.

Biopharmaceuticals US EU News update in the quarter
Arzerra (ofatumumab) CLL (first line & relapsed) Ph III Ph III Recruitment complete.
NHL (FL) Ph III Ph III
NHL (DLBCL) Ph III Ph III
Benlysta (s.c.) Systemic lupus erythematosus Ph III Ph III
albiglutide Type 2 diabetes Ph III Ph III Announced topline results received from 7 of the 8
‘Harmony’ Phase III studies on 3 April 2012 - data support progression towards filing.
Cardiovascular & Metabolic US EU News update in the quarter
darapladib Atherosclerosis Ph III Ph III
Neurosciences US EU News update in the quarter
Horizant Post-herpetic neuralgia Filed Aug 2011 n/a
IPX066 Parkinson’s disease n/a Ph III EU filing strategy under review.

9

Oncology US EU News update in the quarter
Promacta/Revolade Hepatitis C Ph III Ph III Preparing to file.
CLD Ph III Ph III Decision not to progress with this indication.
Votrient (pazopanib) Sarcoma Filed Jun 2011 Filed Jul 2011 Positive FDA Advisory Committee vote on 20 March 2012.
FDA Action Date is 28 April 2012. (see page 1)
Ovarian Ph III Ph III
Tykerb/Tyverb Metastatic breast cancer – dual blockade Filed Feb 2012 Filed Feb 2012 Announced filing in US and EU for use in combination with
trastuzumab and withdrawal of EU file in combination with paclitaxel on 16 February 2012.
Adjuvant breast cancer Ph III Ph III
Head & neck cancer Ph III Ph III
Gastric cancer Ph III Ph III
trametinib
(1120212, MEK inhibitor) Metastatic melanoma Ph III Ph III Preparing to file.
dabrafenib (2118436, BRaf inhibitor) Metastatic melanoma Ph III Ph III Positive data reported in-house from Phase III BREAK-3 study in March
2012. Preparing to file.
Respiratory &
Immuno-inflammation US EU News update in the quarter
Relovair (‘444+’698) COPD Ph III Ph III Announced data from head-to-head studies vs Advair in COPD on 23 March 2012. Progressing to file in US & EU
in mid-2012.
Asthma Ph III Ph III Announced completion of registration programme on 23
March 2012. Progressing to file in mid 2012 in EU. US asthma filing strategy under review.
1605786 (CCX282) Crohn’s disease Ph III Ph III
‘444+’719 COPD Ph III Ph III
‘698 Asthma Ph III
Rare Diseases US EU News update in the quarter
migalastat HCl Fabry disease Ph III Ph III
2402968 Duchenne muscular dystrophy Ph III
2696273 (Ex-vivo stem cell gene therapy) Adenosine deaminase severe combined immune deficiency (ADA-SCID) Ph II/III
Vaccines US EU News update in the quarter
Menhibrix (HibMenCY-TT) MenCY and Hib prophylaxis Filed n/a
Nimenrix (MenACWY) MenACWY prophylaxis Ph III Filed Mar 2011 Positive opinion from CHMP on 17 February 2012. (see page
1)
MAGE-A3 Melanoma Ph III Ph III Recruitment completed in both event driven trials. Key data expected in
2013.
NSCLC Ph III Ph III
Quadrivalent flu Influenza prophylaxis Filed Feb 2012 Filed Mar
2012 Announced US & EU filings 5 March 2012.
Herpes zoster Shingles prophylaxis Ph III Ph III
Mosquirix (RTS,S) Malaria prophylaxis n/a n/a
HIV (ViiV Healthcare) US EU News update in the quarter
dolutegravir (S/GSK1349572) HIV integrase inhibitor Ph III Ph III Announced positive headline data from SPRING-2 study showing non-inferiority of dolutegravir vs raltegravir on 2 April
2012.
dolutegravir-Trii HIV integrase inhibitor + abacavir + lamivudine fixed dose combination Ph III Ph III

10

Financial review

Operating profit

Total results £m Core adjustments Core results £m Core % of turnover Core growth CER %
Turnover 6,640 6,640 100 2
Cost of sales (1,810 ) 99 (1,711 ) (25.8 ) (2 )
Selling, general and administration (2,130 ) 92 (2,038 ) (30.7 ) 2
Research and development (971 ) 79 (892 ) (13.4 ) 4
Royalty income 72 72 1.1 —
Other operating income 236 (236 ) —
Operating profit 2,037 34 2,071 31.2 3
Earnings per share 26.7p 0.6p 27.3p 7

Total operating profit and total earnings per share

Total operating profit was £2,037 million compared with £2,035 million in 2011. This included £81 million of restructuring charges (Q1 2011: £135 million), intangible amortisation of £104 million (Q1 2011: £111 million), intangible impairments of £52 million (Q1 2011: £8 million), legal costs of £33 million (Q1 2011: £nil) and other operating income, including the profit on disposal of the North American non-core OTC brands, of £236 million (Q1 2011: £245 million). More significant differences arose, however, on total profit after tax and total EPS, primarily reflecting the disposal of the Group’s interests in Quest Diagnostics in Q1 2011. Total EPS was 26.7p compared with 30.0p in Q1 2011.

Restructuring programme

The Operating Excellence restructuring programme remains on track to deliver £2.8 billion of annual savings by 2014. Costs of £81 million were charged in the quarter (Q1 2011: £135 million).

Core operating profit

Core operating profit was £2,071 million, a 3% increase in CER terms on a turnover increase of 2% reflecting improved operating leverage. The operating margin improved by 0.2 percentage points to 31.2% compared with Q1 2011, primarily reflecting the benefits of net turnover growth and ongoing cost management offset by continued investments in R&D, new product launches and ongoing growth businesses.

Core cost of sales declined to 25.8% of turnover (2011: 27.0%). This primarily reflected the benefits of net turnover growth and ongoing cost management as well as lower inventory write-offs and a one-off royalty adjustment.

Core SG&A costs were 30.7% of turnover compared with 30.0% in 2011. This reflected continued investment in growth businesses and new product launches as well as the impact of higher exchange losses on settled intercompany transactions, partly funded by ongoing cost management, including savings from the Operational Excellence programme.

Core R&D expenditure grew 4% to £892 million (13.4% of turnover) compared with £856 million in 2011 (13.0% of turnover), reflecting increased investment in the late-stage pipeline.

11

GSK remains focused on delivering an improved return on its investment in R&D. Sales contribution, reduced attrition and cost reduction are all important drivers of an improving internal rate of return. R&D expenditure is not determined as a percentage of sales but instead capital is allocated using strict returns based criteria depending on the pipeline opportunities available.

The operations of Pharmaceuticals R&D are broadly split into Discovery activities (up to the completion of Phase IIa trials) and Development work (from Phase IIb onwards) each supported by specific and common infrastructure and other shared services where appropriate. R&D expenditure for Q1 2012 is analysed below.

Discovery 185 198
Development 418 358
Facilities and central support functions 125 139
728 695
Vaccines 125 125
Consumer Healthcare 39 36
Core R&D 892 856
Amortisation and impairment of intangible assets 77 42
Major restructuring costs 2 17
Total R&D 971 915

Taxation

Tax on core profits amounted to £495 million and represented an effective tax rate of 25.9% (2011: 27.2%). The charge for taxation on total profits amounted to £489 million and represented an effective tax rate of 26.0% (2011: 35.7%). The Group’s balance sheet at 31 March 2012 included a tax payable liability of £1,711 million and a tax recoverable asset of £87 million.

Transfer pricing and other issues are as previously described in the ‘Taxation’ note in the Annual Report 2011. There have been no material changes to tax matters since the publication of the Annual Report.

GSK continues to believe that it has made adequate provision for the liabilities likely to arise from periods which are open and not yet agreed by tax authorities. The ultimate liability for such matters may vary from the amounts provided and is dependent upon the outcome of agreements with relevant tax authorities or litigation.

Core net finance expense and core earnings per share

Core net finance expense decreased slightly to £168 million from £174 million in 2011. This reflected relatively stable levels of net debt as the Group’s strong cash generation funded share repurchases of £218 million and increased dividend payments.

Core EPS of 27.3p increased 7% in CER terms and 5% in sterling terms reflecting the strengthening of Sterling against the Euro and higher exchange losses on settled inter-company transactions, partly offset by the weakness of Sterling against the US Dollar and Japanese Yen.

12

Core adjustments

The adjustments that reconcile core operating profit, profit after tax and earnings per share to total results are as follows:

Operating profit £m Profit after tax £m EPS p Operating profit £m Profit after tax £m EPS p
Core results 2,071 1,418 27.3 2,044 1,375 25.9
Intangible asset amortisation (104 ) (74 ) (1.5 ) (111 ) (76 ) (1.5 )
Intangible asset impairment (52 ) (36 ) (0.7 ) (8 ) (6 ) (0.1 )
Major restructuring costs (81 ) (63 ) (1.3 ) (135 ) (114 ) (2.2 )
Legal costs (33 ) (28 ) (0.6 ) — — —
Other operating income/asset disposals 236 173 3.5 245 405 7.9
(34 ) (28 ) (0.6 ) (9 ) 209 4.1
Total results 2,037 1,390 26.7 2,035 1,584 30.0

Full reconciliations between core results and total results are set out in ‘Unaudited core results reconciliations’ on page 25 and the definition of core results is set out in ‘Core results’ on page 1.

Quarterly dividend

The Board has declared a first interim dividend of 17 pence per share (Q1 2011: 16 pence per share). The equivalent interim dividend receivable by ADR holders is 54.9100 cents per ADS based on an exchange rate of £1/$1.6150. The ex-dividend date will be 9 May 2012, with a record date of 11 May 2012 and a payment date of 5 July 2012.

Share repurchases

During the quarter, GSK repurchased 15.9 million shares (£226 million). GSK has also announced that it expects total share repurchases this year to be £2-£2.5 billion.

Net assets

The book value of net assets increased by £749 million from £8,827 million at 31 December 2011 to £9,576 million at 31 March 2012. This reflects a decrease in the pension deficit together with profits retained exceeding shares repurchased in the period. At 31 March 2012, the net deficit on our pension plans was £1,163 million compared with £1,476 million at 31 December 2011. The decrease in the deficit primarily arose from an increase in UK and US asset values.

The carrying value of investments in associates and joint ventures at 31 March 2012 was £626 million, with a market value of £933 million. Assets held for sale of £514 million at 31 March 2012 included £492 million related to the proposed disposal of the non-core OTC brands.

At 31 March 2012, the ESOP Trusts held 81 million GSK shares against the future exercise of share options and share awards. The carrying value of £430 million has been deducted from other reserves. The market value of these shares was £1,131 million.

During the quarter, the Group purchased £226 million of shares to be held as Treasury shares. At 31 March 2012, the company held 516.5 million Treasury shares at a cost of £6,887 million, which has been deducted from retained earnings.

13

Cash flow and net debt

Net cash inflow from operating activities (£m) 1,012 987
Net debt (£m) 8,877 8,419

The net cash inflow from operating activities for the period was £1,012 million (Q1 2011: £987 million). Excluding legal settlements of £60 million (Q1 2011: £451 million), the net cash inflow from operating activities was £1,072 million, £366 million lower than in Q1 2011. This reflected a greater increase in working capital and a greater decrease in net liabilities compared with Q1 2011, together with higher tax payments.

At 31 March 2012, net debt was £8.9 billion, compared with £9.0 billion at 31 December 2011, comprising gross debt of £14.7 billion and cash and liquid investments of £5.8 billion. At 31 March 2012, GSK had short-term borrowings (including overdrafts) repayable within 12 months of £2,723 million with loans of £1,561 million repayable in the subsequent year.

14

Financial information

Unaudited income statement

Three months ended 31 March 2012

TURNOVER 6,640 6,585
Cost of sales (1,810 ) (1,872 )
Gross profit 4,830 4,713
Selling, general and administration (2,130 ) (2,080 )
Research and development (971 ) (915 )
Royalty income 72 72
Other operating income 236 245
OPERATING PROFIT 2,037 2,035
Finance income 66 19
Finance expense (234 ) (193 )
Profit on disposal of interest in associates — 584
Share of after tax profits of associates and joint ventures 10 19
PROFIT BEFORE TAXATION 1,879 2,464
Taxation (489 ) (880 )
Tax rate % 26.0 % 35.7 %
PROFIT AFTER TAXATION FOR THE PERIOD 1,390 1,584
Profit attributable to non-controlling interests 65 59
Profit attributable to shareholders 1,325 1,525
1,390 1,584
EARNINGS PER SHARE 26.7p 30.0p
Diluted earnings per share 26.3p 29.6p

15

Unaudited statement of comprehensive income

Profit for the period 1,390 1,584
Exchange movements on overseas net assets and net investment hedges 125 (6 )
Fair value movements on available-for-sale investments (8 ) 6
Deferred tax on fair value movements on available-for-sale investments (5 ) 2
Reclassification of fair value movements on available-for-sale investments — (12 )
Deferred tax reversed on reclassification of available-for-sale investments — 1
Actuarial gains on defined benefit plans 295 31
Deferred tax on actuarial movements in defined benefit plans (79 ) (16 )
Fair value movements on cash flow hedges — (2 )
Deferred tax on fair value movements on cash flow hedges (2 ) —
Reclassification of cash flow hedges to income statement — 2
Share of other comprehensive income/(expense) of associates and joint ventures 30 (8 )
Other comprehensive income/(expense) for the period 356 (2 )
Total comprehensive income for the period 1,746 1,582
Total comprehensive income for the period attributable to:
Shareholders 1,683 1,534
Non-controlling interests 63 48
1,746 1,582

16

Unaudited balance sheet

ASSETS
Non-current assets
Property, plant and equipment 8,616 9,020 8,748
Goodwill 3,659 3,712 3,754
Other intangible assets 7,605 8,580 7,802
Investments in associates and joint ventures 626 637 560
Other investments 573 687 590
Deferred tax assets 2,722 2,514 2,849
Derivative financial instruments 88 93 85
Other non-current assets 635 534 525
Total non-current assets 24,524 25,777 24,913
Current assets
Inventories 4,008 4,035 3,873
Current tax recoverable 87 51 85
Trade and other receivables 5,753 5,949 5,576
Derivative financial instruments 77 82 70
Liquid investments 203 170 184
Cash and cash equivalents 5,636 6,498 5,714
Assets held for sale 514 16 665
Total current assets 16,278 16,801 16,167
TOTAL ASSETS 40,802 42,578 41,080
LIABILITIES
Current liabilities
Short-term borrowings (2,723 ) (258 ) (2,698 )
Trade and other payables (7,058 ) (7,246 ) (7,359 )
Derivative financial instruments (56 ) (174 ) (175 )
Current tax payable (1,711 ) (1,604 ) (1,643 )
Short-term provisions (2,985 ) (3,829 ) (3,135 )
Total current liabilities (14,533 ) (13,111 ) (15,010 )
Non-current liabilities
Long term borrowings (11,992 ) (14,829 ) (12,203 )
Deferred tax liabilities (824 ) (732 ) (822 )
Pensions and other post-employment benefits (2,775 ) (2,608 ) (3,091 )
Other provisions (497 ) (784 ) (499 )
Derivative financial instruments (2 ) (5 ) (2 )
Other non-current liabilities (603 ) (622 ) (626 )
Total non-current liabilities (16,693 ) (19,580 ) (17,243 )
TOTAL LIABILITIES (31,226 ) (32,691 ) (32,253 )
NET ASSETS 9,576 9,887 8,827
EQUITY
Share capital 1,390 1,416 1,387
Share premium account 1,782 1,435 1,673
Retained earnings 3,956 4,985 3,370
Other reserves 1,648 1,235 1,602
Shareholders’ equity 8,776 9,071 8,032
Non-controlling interests 800 816 795
TOTAL EQUITY 9,576 9,887 8,827

17

Unaudited statement of changes in equity

At 1 January 2012 1,387 1,673 3,370 1,602 8,032 795 8,827
Profit for the period 1,325 1,325 65 1,390
Other comprehensive income/ (expense) for the period 374 (16 ) 358 (2 ) 356
Total comprehensive income/ (expense) for the period 1,699 (16 ) 1,683 63 1,746
Distributions to non-controlling interests (47 ) (47 )
Dividends to shareholders (847 ) (847 ) — (847 )
Changes in non-controlling interests 11 11 (11 ) —
Shares issued 3 109 112 112
Ordinary shares purchased and held as Treasury shares (226 ) (226 ) (226 )
Consideration received for shares transferred by ESOP Trusts 6 6 6
Shares acquired by ESOP Trusts (39 ) (39 ) (39 )
Write-down on shares held by ESOP Trusts (95 ) 95 —
Share-based incentive plans 44 44 44
At 31 March 2012 1,390 1,782 3,956 1,648 8,776 800 9,576
At 1 January 2011 1,418 1,428 4,779 1,262 8,887 858 9,745
Profit for the period 1,525 1,525 59 1,584
Other comprehensive income/ (expense) for the period 13 (4 ) 9 (11 ) (2 )
Total comprehensive income/ (expense) for the period 1,538 (4 ) 1,534 48 1,582
Distributions to non-controlling interests (108 ) (108 )
Dividends to shareholders (816 ) (816 ) (816 )
Changes in non-controlling interests 18 18
Forward contract relating to non-controlling interest (30 ) (30 ) (30 )
Shares issued 7 7 7
Ordinary shares purchased and cancelled or held as Treasury shares (2 ) (518 ) 2 (518 ) (518 )
Consideration received for shares transferred by ESOP Trusts 1 1 1
Shares acquired by ESOP Trusts (28 ) (28 ) (28 )
Write-down on shares held by ESOP Trusts (32 ) 32 —
Share-based incentive plans 34 34 34
At 31 March 2011 1,416 1,435 4,985 1,235 9,071 816 9,887

18

Unaudited cash flow statement

Three months ended 31 March 2012

Profit after tax 1,390 1,584
Tax on profits 489 880
Share of after tax profits of associates and joint ventures (10 ) (19 )
Profit on disposal of interest in associates — (584 )
Net finance expense 168 174
Depreciation and other non-cash items 240 130
Increase in working capital (438 ) (295 )
Decrease in other net liabilities (427 ) (569 )
Cash generated from operations 1,412 1,301
Taxation paid (400 ) (314 )
Net cash inflow from operating activities 1,012 987
Cash flow from investing activities
Purchase of property, plant and equipment (168 ) (175 )
Proceeds from sale of property, plant and equipment 10 17
Purchase of intangible assets (87 ) (94 )
Proceeds from sale of intangible assets 390 220
Purchase of equity investments (4 ) (5 )
Proceeds from sale of equity investments 1 14
Purchase of businesses, net of cash acquired (14 ) (240 )
Investment in associates and joint ventures (21 ) (11 )
Proceeds from disposal of subsidiary and interest in associate — 1,044
Decrease in liquid investments (25 ) 40
Interest received 19 23
Dividends from associates and joint ventures 29 2
Net cash inflow from investing activities 130 835
Cash flow from financing activities
Proceeds from own shares for employee share options 6 1
Issue of share capital 112 7
Shares acquired by ESOP Trusts (39 ) (28 )
Shares purchased and cancelled or held as Treasury shares (218 ) (303 )
Repayment of short-term loans (2 ) (4 )
Increase in short-term loans (8 ) 2
Net repayment of obligations under finance leases (8 ) (8 )
Interest paid (81 ) (55 )
Dividends paid to shareholders (847 ) (816 )
Distributions to non-controlling interests (47 ) (108 )
Other financing items (100 ) 1
Net cash outflow from financing activities (1,232 ) (1,311 )
(Decrease)/increase in cash and bank overdrafts in the period (90 ) 511
Exchange adjustments (26 ) (39 )
Cash and bank overdrafts at beginning of the period 5,606 5,807
Cash and bank overdrafts at end of the period 5,490 6,279
Cash and bank overdrafts at end of the period comprise:
Cash and cash equivalents 5,636 6,498
Overdrafts (146 ) (219 )
5,490 6,279

19

Notes to the unaudited condensed financial information

  1. Accounting policies and basis of preparation

This unaudited Results Announcement contains condensed financial information for the three months ended 31 March 2012 is prepared in accordance with IAS34, ‘Interim financial reporting’ and should be read in conjunction with the Annual Report 2011; both of which were prepared in accordance with International Financial Reporting Standards as adopted by the European Union. This Results Announcement has been prepared applying consistent accounting policies to those applied by the Group in the Annual Report 2011.

As noted under ‘Segment information’ below, the segments for which turnover and operating profit are disclosed have been amended to reflect changes in the Group’s internal management structure together with certain changes to the therapeutic classifications of turnover by product. In addition, charges for amortisation and impairment of intangible assets related to marketed products are now reported in cost of sales rather than in SG&A. Comparative information has been restated accordingly. The adjustment for Q1 2011 increases cost of sales and decreases SG&A by £77 million.

This Results Announcement does not constitute statutory accounts of the Group within the meaning of sections 434(3) and 435(3) of the Companies Act 2006. The balance sheet at 31 December 2011 has been derived from the full Group accounts published in the Annual Report 2011, which has been delivered to the Registrar of Companies and on which the report of the independent auditors was unqualified and did not contain a statement under section 498 of the Companies Act 2006.

  1. Exchange rates

The results and net assets of the Group, as reported in Sterling, are affected by movements in exchange rates between Sterling and other currencies. Average exchange rates, as modified by specific transaction rates for large transactions, prevailing during the period are used to translate the results and cash flows of overseas subsidiaries, associates and joint ventures into Sterling. Period-end rates are used to translate the net assets of those entities. The currencies which most influenced these transactions and the relevant exchange rates were:

Average rates:
US$/£ 1.58 1.60 1.61
Euro/£ 1.20 1.16 1.15
Yen/£ 125 131 128
Period end rates:
US$/£ 1.60 1.60 1.55
Euro/£ 1.20 1.13 1.20
Yen/£ 132 133 120

During Q1, average Sterling exchange rates were weaker against the US Dollar and the Yen but stronger against the Euro compared with the same period in 2011. If exchange rates were to hold at these period end rates for the rest of 2012 and there were no further exchange gains or losses, the estimated adverse impact on 2012 sterling core EPS would be approximately 1%.

  1. Segment information

As announced on 28 March 2012, GSK has revised its segment information disclosures to reflect changes in the internal reporting structures with effect from 1 January 2012. The Pharmaceuticals and Vaccines businesses in Emerging Markets and Asia Pacific (excluding Australasia) have been combined into one segment (EMAP). In addition, the classification of certain products has been changed in 2012, including

• The transfer of OTC dermatology brands acquired with the Stiefel business from the Pharmaceuticals and Vaccines business to Consumer Healthcare in the US and Europe;

• The creation of a Rare diseases therapy area; and

• The transfer of Zovirax from the Dermatology therapy area to the Anti-virals therapy area.

Comparative information has been restated on a consistent basis.

Our operating segments are being reported based on the financial information provided to the Chief Executive Officer and the responsibilities of the Corporate Executive Team (CET). Individual members of the CET are responsible for each geographic segment of the Pharmaceuticals and Vaccines business, ViiV Healthcare and the Consumer Healthcare business as a whole, respectively.

20

R&D investment is essential for the sustainability of the pharmaceutical businesses. However, for segment reporting, the US, Europe, EMAP and Japan Pharmaceuticals and Vaccines operating profits exclude allocations of globally funded R&D as well as central costs, principally corporate functions and unallocated manufacturing costs. Our management reporting process allocates intra-Group profit on a product sale to the market in which that sale is recorded, and the profit analyses below have been presented on that basis.

Other trading and unallocated pharmaceuticals and vaccines includes Canada, Puerto Rico, Australasia, central vaccine tender sales and contract manufacturing sales, together with costs such as vaccines R&D, central dermatology costs and central manufacturing costs not attributed to other segments.

The Pharmaceuticals R&D segment is the responsibility of the Chairman, Research & Development and is reported as a separate segment.

Corporate and other unallocated costs and disposal profits include corporate functions, costs for legal matters, fair value movements on financial instruments and investments and profits on global asset disposals.

Turnover by segment

US 1,784 1,616 9
Europe 1,295 1,417 (6 )
EMAP 1,052 1,050 2
Japan 549 506 4
ViiV Healthcare 334 353 (5 )
Other trading and unallocated pharmaceuticals and vaccines 290 301 (5 )
Pharmaceuticals and Vaccines 5,304 5,243 2
Consumer Healthcare 1,336 1,342 1
6,640 6,585 2

Operating profit by segment

US 1,259 1,043 19
Europe 672 788 (11 )
EMAP 311 335 (4 )
Japan 342 310 4
ViiV Healthcare 239 203 19
Pharmaceuticals R&D (689 ) (662 ) 3
Other trading and unallocated pharmaceuticals and vaccines (81 ) (44 ) 66
Pharmaceuticals and Vaccines 2,053 1,973 5
Consumer Healthcare 236 245 (1 )
Segment profit 2,289 2,218 4
Corporate and other unallocated costs and disposal profits (218 ) (174 ) 20
Core operating profit 2,071 2,044 3
Non-core items (34 ) (9 )
Total operating profit 2,037 2,035 2
Finance income 66 19
Finance costs (234 ) (193 )
Profit on disposal of interest in associates — 584
Share of after tax profits of associates and joint ventures 10 19
Profit before taxation 1,879 2,464 (22 )

21

  1. Weighted average number of shares
Weighted average number of shares – basic 4,963 5,087
Dilutive effect of share options and share awards 72 52
Weighted average number of shares – diluted 5,035 5,139

At 31 March 2012, 4,962 million shares were in free issue (excluding Treasury shares and shares held by the ESOP Trusts). This compares with 5,073 million shares at 31 March 2011

  1. Dividends
2012
First interim 5 July 2012 17 844
2011
First interim 7 July 2011 16 814
Second interim 6 October 2011 16 809
Third interim 5 January 2012 17 847
Fourth interim 12 April 2012 21 1,042
70 3,512
Supplemental 12 April 2012 5 248
75 3,760
  1. Taxation

Tax on core profits amounted to £495 million and represented an effective tax rate of 25.9% (2011: 27.2%). The charge for taxation on total profits amounted to £489 million and represented an effective tax rate of 26.0% (2011: 35.7%). The Group’s balance sheet at 31 March 2012 included a tax payable liability of £1,711 million and a tax recoverable asset of £87 million.

Transfer pricing and other issues are as previously described in the ‘Taxation’ note in the Annual Report 2011. There have been no material changes to tax matters since the publication of the Annual Report.

GSK continues to believe that it has made adequate provision for the liabilities likely to arise from periods which are open and not yet agreed by tax authorities. The ultimate liability for such matters may vary from the amounts provided and is dependent upon the outcome of agreements with relevant tax authorities or litigation.

  1. Net assets

The book value of net assets increased by £749 million from £8,827 million at 31 December 2011 to £9,576 million at 31 March 2012. This reflects a decrease in the pension deficit together with profits retained exceeding shares repurchased in the period. At 31 March 2012, the net deficit on pension plans was £1,163 million compared with £1,476 million at 31 December 2011. The decrease in the deficit primarily arose from an increase in UK and US asset values.

The carrying value of investments in associates and joint ventures at 31 March 2012 was £626 million, with a market value of £933 million. Assets held for sale of £514 million at 31 March 2012 included £492 million related to the proposed disposal of the non-core OTC brands.

At 31 March 2012, the ESOP Trusts held 81 million GSK shares against the future exercise of share options and share awards. The carrying value of £430 million has been deducted from other reserves. The market value of these shares was £1,131 million. During the quarter, the Group purchased £226 million of shares to be held as Treasury shares At 31 March 2012, the company held 516.5 million Treasury shares at a cost of £6,887 million, which has been deducted from retained earnings.

22

  1. Contingent liabilities

There were contingent liabilities at 31 March 2012 in respect of guarantees and indemnities entered into as part of the ordinary course of our business. No material losses are expected to arise from such contingent liabilities. Provision is made for the outcome of legal and tax disputes where it is both probable that the Group will suffer an outflow of funds and it is possible to make a reliable estimate of that outflow. Descriptions of the significant legal and tax disputes to which the Group is a party are set out in ‘Legal matters’ below and ‘Taxation’ on page 22, respectively.

  1. Reconciliation of cash flow to movements in net debt
Net debt at beginning of the period (9,003 ) (8,859 )
(Decrease)/increase in cash and bank overdrafts (90 ) 511
Cash outflow/(inflow) from liquid investments 25 (40 )
Net repayment of short-term loans 10 2
Net repayment of obligations under finance leases 8 8
Debt of subsidiaries acquired — (2 )
Exchange adjustments 172 (79 )
Other non-cash movements 1 40
Decrease in net debt 126 440
Net debt at end of the period (8,877 ) (8,419 )
  1. Related party transactions

The Group’s significant related parties are its joint ventures and associates as disclosed in the Annual Report 2011.

On 20 April 2012, the Group announced the disposal of non-core OTC brands in International markets to Aspen Pharmacare Holdings Ltd, the Group’s principal associate, for £164 million. The majority of this transaction was completed on 30 April 2012.

Apart from the above transaction, there were no material transactions with any of the Group’s joint ventures and associates in the period. There were no material transactions with Directors.

  1. Business acquisitions

There were no material acquisitions in the period.

  1. Business and asset disposals

On 15 March 2012, GSK announced that it had reached agreement to divest the previously identified non-core OTC brands in Europe to Omega Pharma for €470 million (£391 million) in cash.

  1. Post balance sheet event

On 20 April 2012, GSK announced that it had reached agreement to divest the previously identified non-core OTC brands in its international markets to Aspen Pharmacare Holdings Limited (Aspen) for £164 million in cash.

  1. Legal matters

The Group is involved in significant legal and administrative proceedings principally product liability, intellectual property, tax, anti-trust and governmental investigations as well as related private litigation, which are more fully described in the ‘Legal Proceedings’ note in the Annual Report 2011.

At 31 March 2012, the Group’s aggregate provision for legal and other disputes (not including tax matters described under ‘Taxation’ on page 22 was £2.6 billion (31 December 2011: £2.8 billion). In respect of a number of significant legal proceedings in which the Group is or may become involved, it is not possible to make a reliable estimate of the expected financial effect, if any, that could result from ultimate resolution of the proceedings. In these cases, the Group would provide appropriate disclosures about such cases, but no provision would be made.

23

The ultimate liability for legal claims may vary from the amounts provided and is dependent upon the outcome of litigation proceedings, investigations and possible settlement negotiations. The Group’s position could change over time, and, therefore, there can be no assurance that any losses that result from the outcome of any legal proceedings will not exceed by a material amount the amount of the provisions reported in the Group’s financial accounts.

There have been no significant developments since the date of the Annual Report 2011.

24

Unaudited core results reconciliations

The reconciliations between core results and total results for Q1 2012 and Q1 2011 are set out below.

Income statement – Core results reconciliation

Three months ended 31 March 2012

Turnover 6,640 6,640
Cost of sales (1,711 ) (79 ) (20 ) (1,810 )
Gross profit 4,929 (79 ) (20 ) 4,830
Selling, general and administration (2,038 ) (59 ) (33 ) (2,130 )
Research and development (892 ) (25 ) (52 ) (2 ) (971 )
Royalty income 72 72
Other operating income 236 236
Operating profit 2,071 (104 ) (52 ) (81 ) (33 ) 236 2,037
Net finance costs (168 ) (168 )
Share of after tax profits of associates and joint ventures 10 10
Profit before taxation 1,913 (104 ) (52 ) (81 ) (33 ) 236 1,879
Taxation (495 ) 30 16 18 5 (63 ) (489 )
Tax rate % 25.9 % 26.0 %
Profit after taxation 1,418 (74 ) (36 ) (63 ) (28 ) 173 1,390
Profit attributable to non-controlling interests 65 65
Profit attributable to shareholders 1,353 (74 ) (36 ) (63 ) (28 ) 173 1,325
Earnings per share 27.3p (1.5 )p (0.7 )p (1.3 )p (0.6 )p 3.5p 26.7p
Weighted average number of shares (millions) 4,963 4,963

25

Income statement – Core results reconciliation

Three months ended 31 March 2011

Turnover 6,585 6,585
Cost of sales (1,780 ) (77 ) (15 ) (1,872 )
Gross profit 4,805 (77 ) (15 ) 4,713
Selling, general and administration (1,977 ) (103 ) (2,080 )
Research and development (856 ) (34 ) (8 ) (17 ) (915 )
Royalty income 72 72
Other operating income — 245 245
Operating profit 2,044 (111 ) (8 ) (135 ) 245 2,035
Net finance costs (174 ) (174 )
Profit on disposal of interest in associates — 584 584
Share of after tax losses of associates and joint ventures 19 19
Profit before taxation 1,889 (111 ) (8 ) (135 ) 829 2,464
Taxation (514 ) 35 2 21 (424 ) (880 )
Tax rate % 27.2 % 35.7 %
Profit after taxation 1,375 (76 ) (6 ) (114 ) 405 1,584
Profit attributable to non-controlling interests 59 59
Profit attributable to shareholders 1,316 (76 ) (6 ) (114 ) 405 1,525
Earnings per share 25.9p (1.5p ) (0.1p ) (2.2p ) 7.9p 30.0p
Weighted average number of shares (millions) 5,087 5,087

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Cautionary statement regarding forward-looking statements

This Results Announcement includes forward-looking statements within the meaning of Section 27A of the US Securities Act of 1933, as amended, and Section 21E of the US Securities Exchange Act of 1934, as amended. You should not place undue reliance on these statements. In addition, in the future the Group, and others on the Group’s behalf, may make statements that constitute forward-looking statements. Such forward-looking statements may include, without limitation, statements relating to the following:

• the Group’s plans, objectives and goals;

• the Group’s future economic performance and prospects;

• the potential effect on the Group’s future performance of certain contingencies and assumptions underlying any such statements.

You can identify forward-looking statements by the fact that they do not relate strictly to historical or current facts. Words such as ‘believes’, ‘anticipates’, ‘expects’, ‘intends’, ‘estimates’ and ‘plans’ and similar expressions are intended to identify forward-looking statements but these are not the exclusive means of identifying such statements. The Group does not intend to update these forward-looking statements except as may be required by applicable securities laws. Forward-looking statements are subject to important risks, uncertainties and assumptions that are difficult to predict. The results or events predicted in forward-looking statements may differ materially from actual results or events. Some of the factors that could cause actual results or events to differ from current expectations include the following:

• the cost, uncertainty and other risks associated with the development of new pharmaceutical products that may never reach the market or that may have limited marketability or profitability, despite the Group’s significant investment of time and money in their development;

• failure to obtain effective intellectual property protection, the unplanned loss of patents as a result of patent infringement litigation, changes in intellectual property laws and regulations or the weakness of intellectual property protection in certain countries in which the Group operates;

• the outcome of current and future legal proceedings and government investigations;

• the highly competitive nature of the pharmaceutical business and potential innovations and technical advances by the Group’s competitors, in addition to the intensification of price competition resulting from consolidation in the industry;

• competition from producers of generic pharmaceutical products, especially upon the loss of patents for the Group’s products due to their expiration, successful legal challenges to the Group’s patents by its competitors or the reduction and relaxation of patent protection in some developing countries;

• new and possibly increasing levels of price controls with respect to the Group’s products in many markets;

• the risks associated with the increasingly demanding regulatory controls governing the pharmaceutical industry, which could include increased costs of production and time for product development and regulatory approval, as well as a heightened risk that previously granted regulatory approvals could be withdrawn;

• failures in compliance by the Group’s suppliers of key services and materials or the Group’s own manufacturing facilities, which could lead to product recalls and seizures, interruption of production and delays in the approvals of new products pending resolution of manufacturing issues, as well as potential fines or disgorgement of profits;

• the Group’s ability to implement its strategic priorities;

• the failure to comply with appropriate legislation related to anti-bribery and corruption;

• credit risks of the Group’s wholesalers due to increasing concentration of wholesalers to whom the Group sells its products;

• failures to implement appropriate safeguards adequately to protect against unauthorised or unintentional access, acquisition, use, modification, loss or disclosure of critical or sensitive data;

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• changes in tax, inflation, interest or foreign currency exchange rates and controls or other economic factors affecting the Group’s businesses or the possibility of political unrest in countries in which the Group does business;

• changes in environmental regulations, which could increase the Group’s costs of compliance and otherwise affect the Group’s business;

• the strength of the global economy in general and the strength of the economies of the countries in which the Group conducts its operations in particular;

• the effects of changes in accounting policies or practices competition for qualified employees;

• the Group’s ability to maintain sufficient liquidity and to access capital markets; and

• acquisitions the Group may undertake in the future.

The Group cautions you that the foregoing list of important factors is not exhaustive. When evaluating forward-looking statements, you should carefully consider the foregoing factors and other uncertainties and events, as well as the factors described under ‘Risk Factors’ in the ‘Financial review & risk section’ in the company’s Annual Report 2011 included as exhibit 15.2 to the company’s Annual Report on Form 20-F for 2011.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorised.

GlaxoSmithKline plc

(Registrant)

Date: May 2, 2012
By: /s/ VICTORIA WHYTE
Victoria Whyte
Authorised Signatory for and on
behalf of GlaxoSmithKline plc