chemistry

GSK plc

GSK plc is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand GSK plc rather than just read about it. In short: 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.

Key takeaways

GSK plc belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GSK plc to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GSK plc from memory before moving on to harder problems.

Reference excerpt

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. 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. 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 . The company developed the first malaria vaccine, RTS,S, which it said in 2014, it would make available for five per cent above cost. Legacy products developed at GSK include several listed in the World Health Organization's List of Essential Medicines, such as amoxicillin, mercaptopurine, pyrimethamine, and zidovudine. In 2012, under prosecution by the United States Department of Justice (DoJ) based on combined investigations of the Department of Health and Human Services (HHS-OIG), FDA and FBI, primarily concerning sales and marketing of the drugs Avandia, Paxil and Wellbutrin, GSK pleaded guilty to promotion of drugs for unapproved uses, failure to report safety data and kickbacks to physicians in the United States and agreed to pay a US$3 billion (£1.9bn) settlement. It was the largest health-care fraud case to date in the US and the largest settlement in the pharmaceutical industry.

History

Glaxo Wellcome

Glaxo Joseph Nathan and Co. was founded in 1873, as a general trading company in Wellington, New Zealand, by a Londoner, Joseph Edward Nathan. In 1904, it began producing a dried-milk baby food from excess milk produced on dairy farms near Bunnythorpe. The resulting product was first known as Defiance, then as Glaxo (cf. Greek galaxias, "milky"), and was sold with the slogan "Glaxo builds bonnie babies." The Glaxo Laboratories sign is still visible on what is now a car repair shop on the main street of Bunnythorpe. The company's first pharmaceutical product, released in 1924, was vitamin D.

Glaxo Laboratories was incorporated as a distinct subsidiary company in London in 1935. Joseph Nathan's shareholders reorganised the group's structure in 1947, making Glaxo the parent and obtained a listing on the London Stock Exchange. Glaxo acquired Allen & Hanburys in 1958. The Scottish pharmacologist David Jack was hired as a researcher for Allen & Hanburys a few years after Glaxo took it over; he went on to lead the company's research and development (R&D) until 1987. After Glaxo bought Meyer Laboratories in 1978, it began to play an important role in the US market. In 1983, the American arm, Glaxo Inc., moved to Research Triangle Park (US headquarters/research) and Zebulon (US manufacturing) in North Carolina.

Burroughs Wellcome Burroughs Wellcome & Company was founded in 1880, in London by the American pharmacists Henry Wellcome and Silas Burroughs. The Wellcome Tropical Research Laboratories opened in 1902. In the 1920s, Burroughs Wellcome established research and manufacturing facilities in Tuckahoe, New York, which served as the US headquarters until the company moved to Research Triangle Park in North Carolina in 1971. The Nobel Prize winning scientists Gertrude B. Elion and George H. Hitchings worked there and invented drugs still used many years later, such as mercaptopurine. In 1959, the Wellcome Foundation bought Cooper, McDougall & Robertson Inc to become more active in animal health. When Burroughs Wellcome decided to move its headquarters, the company selected Paul Rudolph to design its new building. The Elion-Hitchings Building "was celebrated worldwide when it was built," according to Paul Rudolph Heritage Foundation president Kelvin Dickinson. Alex Sayf Cummings of Georgia State University wrote in 2016, that the "iconic building helped define the image of RTP," saying, "Love it or hate it, Rudolph's design remains an impressively audacious creative gesture and an important part of the history of both architecture and Research Triangle Park." United Therapeutics, which bought the building in 2012, announced plans in 2020, to tear it down.

Merger Glaxo and Wellcome merged in 1995, to form Glaxo Wellcome plc. The merger was then considered the biggest in the UK corporate history. Glaxo Wellcome restructured its R&D operation that year, cutting 10,000 jobs worldwide, closing its R&D facility in Beckenham, Kent, and opening a Medicines Research Centre in Stevenage, Hertfordshire. Also that year, Glaxo Wellcome acquired the California-based Affymax, a leader in the field of combinatorial chemistry. By 1999, Glaxo Wellcome had become the world's third-largest pharmaceutical company by revenues (behind Novartis and Merck), with a global market share of around 4 per cent. Its products included Imigran (for the treatment of migraine), salbutamol (Ventolin) (for the treatment of asthma), Zovirax (for the treatment of coldsores), and Retrovir and Epivir (for the treatment of AIDS). In 1999, the company was the world's largest manufacturer of drugs for the treatment of asthma and HIV/AIDS. It employed 59,000 people, including 13,400 in the UK, had 76 operating companies and 50 manufacturing facilities worldwide, and seven of its products were among the world's top 50 best-selling pharmaceuticals. The company had R&D facilities in Hertfordshire, Kent, London and Verona (Italy), and manufacturing plants in Scotland and the north of England. It had R&D centres in the US and Japan, and production facilities in the US, Europe and the Far East.

SmithKline Beecham

Beecham

In 1848, Thomas Beecham launched his Beecham's Pills laxative in England, giving birth to the Beecham Group. In 1859, Beecham opened its first factory in St Helens, Lancashire. By the 1960s, Beecham was extensively involved in pharmaceuticals and consumer products such as Macleans toothpaste, Lucozade and synthetic penicillin research.

SmithKline

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with GSK plc

Start with the simplest possible case. Write down what GSK plc claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to GSK plc before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about GSK plc ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of GSK plc

In research: GSK plc appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses GSK plc in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: GSK plc is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2000 establishments in England, Biotechnology companies established in 2000, Biotechnology companies of the United Kingdom, so understanding it makes those chapters shorter.
In everyday life: Look for GSK plc outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study GSK plc in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GSK plc means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain GSK plc out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GSK plc in simple terms?

Why does GSK plc matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study GSK plc?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on GSK plc.