GSK plc
GSK plc (an abbreviation of its former name GlaxoSmithKline plc) is a British multinational pharmaceutical and biotechnology company. It was established in 2000 by a merger of Glaxo Wellcome and SmithKline Beecham, which was itself a merger of a number of pharmaceutical companies around the Smith, Kline & French firm. It is headquartered in London, England.
Basic company information
Each field links to its source. Financial figures retain their reporting periods; background references are identified in the source list.
- Ticker / security symbols
- GSK, GLAXF [1]
- Listing exchanges
- NYSE, OTC [1]
- SEC industry
- Pharmaceutical Preparations [1]
- Business sectors
- pharmaceutical industry; biotechnology [2]
- Company / filing name
- GSK plc [1]
- Headquarters location
- London [2]
- Business address
- 79 NEW OXFORD STREET, LONDON, WC1A 1DG [1]
- Founded
- 2000-12-27 [2]
- Legal form
- public limited company [2]
- Incorporation jurisdiction
- United Kingdom [1]
- Leadership in background record
- Emma Walmsley [2]
- Official website
- www.gsk.com ↗ [2]
- Employees
- 99,300 · reported year 2016 [2]
- ISIN (reported securities)
- GB0009252882 [2]
- CIK
- 0001131399 [1]
- SIC code
- 2834 [1]
- Country in background record
- United Kingdom [2]
Company positioning and business
GSK plc (an abbreviation of its former name GlaxoSmithKline plc) is a British multinational pharmaceutical and biotechnology company. It was established in 2000 by a merger of Glaxo Wellcome and SmithKline Beecham, which was itself a merger of a number of pharmaceutical companies around the Smith, Kline & French firm. It is headquartered in London, England. [3]
GSK is the tenth-largest pharmaceutical company in the world by earnings, $9.32 billion in 2025 with $42.4 billion in revenues in the same period. As of February 2026 it is the 175th most valuable company in the world and the 12th most valuable pharmaceutical company with a market capitalisation of $122.6 billion. It was also ranked 388th on the 2025 Fortune Global 500. [3]
The company has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index, the eighth largest on the London Stock Exchange behind British pharmaceutical rival AstraZeneca, which occupies the No 1 spot in London at a value of $325 billion, 2.7x more than GSK . [3]
Background text: Wikipedia contributors, GSK plc. Selected introductory paragraphs, licensed under CC BY-SA 4.0. Official filing data is cited separately.
Management and corporate governance
The Wikidata background record identifies Emma Walmsley in the chief-executive role. This background entry is not an official confirmation of the current board or executive roster. [2]
Understanding company scale
Employees: 99,300 · reported year 2016. [2]
Financial year, securities and disclosures
Listed securities: GSK (NYSE), GLAXF (OTC). Multiple symbols may represent different share classes or securities of the same registrant. [4]
History and key events
Financial results and regulatory disclosures
Annual, quarterly and current reports from the collected SEC record. Insider Forms 4 and 144 are excluded. This is a selected list, not a live filing feed.
Source-verified relationships
Companies in the same industry
Comparison candidates share the SEC SIC classification 2834. This does not imply ownership, partnership or trading relationships.
Related entities and concepts
Frequently asked questions
When was GSK plc founded?
Founded: 2000-12-27. The linked source provides the background record. [2]
Where is the headquarters of GSK plc?
Headquarters location: London. The linked source provides the background record. [2]
Which business sectors are recorded for GSK plc?
Business sectors: pharmaceutical industry; biotechnology. The linked source provides the background record. [2]
GSK plc relationship map
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3 verified direct relationships. Industry peers are not relationship edges.
Sources and review dates
- SEC — GSK plc filing identity and securities ↗
- Wikidata — company background record (CC0) ↗
- Wikipedia contributors — GSK plc (CC BY-SA 4.0) ↗
- SEC securities directory ↗
- Company chronology / filing ↗
Reviewed 23 October 2026. Financial periods and historical event dates are shown separately. Figures reflect their stated source dates; this page is not a live quote or investment recommendation.