By the 1950s, Pfizer had established offices in Belgium, Brazil, Canada, Cuba, Mexico, Panama, Puerto Rico, and the United Kingdom. In 1960, the company moved its medical research laboratory operations out of New York City to a new facility in Groton, Connecticut. In 1980, Pfizer launched Feldene (piroxicam), a prescription anti-inflammatory medication that became Pfizer's first product to reach $1 billion in revenue.
As the area surrounding its Brooklyn, NY plant fell into decline in the 1970s and 1980s, the company formed a public-private partnership with New York City that encompassed the construction of low- and middle-income housing, the refurbishment of apartment buildings for the homeless and the establishment of a charter school.
Between 2007 and 2010, Pfizer spent $3.3 million on investigations and legal fees and recovered about $5.1 million, and had another $5 million of pending recoveries from civil lawsuits against makers of counterfeit prescription drugs. Pfizer has hired customs and narcotics experts worldwide to track down fakes and assemble evidence that can be used to pursue civil suits for trademark infringement.
In June 2000, Pfizer acquired Warner-Lambert outright for $116 billion. To satisfy conditions imposed by antitrust regulators at the Federal Trade Commission, Pfizer sold off or transferred stakes in several minor products, including RID (a shampoo for treatment of head lice, sold to Bayer) and Warner-Lambert's antidepressant Celexa (which competes with Zoloft). The acquisition created what was, at the time, the second-largest pharmaceutical company worldwide.
In October 2006, the company announced it would acquire PowerMed.
In February 2011, Pfizer announced the closure of its UK research and development facility (formerly also a manufacturing plant) in Sandwich, Kent, which at the time employed 2,400 people. In March 2011, Pfizer acquired King Pharmaceuticals for $3.6 billion in cash. King produced emergency injectables such as the EpiPen.
In September 2014, the company acquired Innopharma for $225 million, plus up to $135 million in milestone payments, in a deal that expanded Pfizer's range of generic and injectable drugs.
On January 5, 2015, the company announced it would acquire a controlling interest in Redvax, expanding its vaccine portfolio targeting human cytomegalovirus. In February 2015, the company received approval from the Food and Drug Administration for palbociclib (Ibrance) for treatment of certain types of breast cancer. In March 2015, the company announced it would restart its collaboration with Eli Lilly and Company surrounding the Phase III trial of Tanezumab. In May 2015, Pfizer and a Bar-Ilan University laboratory announced a partnership based on the development of medical DNA nanotechnology. In June 2015, the company acquired Nimenrix and Mencevax, meningococcal vaccines, from GlaxoSmithKline for around $130 million. In September 2015, Pfizer acquired Hospira for $17 billion, including the assumption of debt. Hospira was the largest producer of generic injectable pharmaceuticals in the world. On November 23, 2015, Pfizer and Allergan announced a planned $160 billion merger, in the largest pharmaceutical deal ever and the third largest corporate merger in history. The proposed transaction contemplated that the merged company maintain Allergan's Republic of Ireland domicile, resulting in the new company being subject to corporation tax at the relatively low rate of 12.5%. The deal was to constitute a reverse merger, whereby Allergan acquired Pfizer, with the new company then changing its name to "Pfizer, plc". On April 6, 2016, Pfizer and Allergan terminated the merger agreement after the Obama administration and the United States Department of the Treasury introduced new laws intended to limit corporate inversions (the extent to which companies could move their headquarters overseas in order to reduce the amount of taxes they pay).
In June 2016, the company acquired Anacor Pharmaceuticals for $5.2 billion, expanding its portfolio in both inflammation and immunology drugs areas. In August 2016, the company made a $40 million bid for the assets of BIND Therapeutics, which was in bankruptcy. The same month, the company acquired Bamboo Therapeutics for $645 million, expanding its gene therapy offerings. In September 2016, the company acquired cancer drug-maker Medivation for $14 billion. In October 2016, the company licensed the anti-CTLA4 monoclonal antibody, ONC-392, from OncoImmune. In November 2016, Pfizer funded a $3,435,600 study with the CDC Foundation to research "screen-and-treat" strategies for cryptococcal disease in Botswana. In December 2016, Pfizer acquired AstraZeneca's small-molecule antibiotics business for $1.575 billion.
In January 2018, Pfizer announced that it would end its work on research into treatments for Alzheimer's disease and Parkinsonism (a symptom of Parkinson's disease and other conditions). The company said about 300 researchers would lose their jobs. In July 2018, the Food and Drug Administration approved enzalutamide, developed by Pfizer and Astellas Pharma for patients with castration-resistant prostate cancer. In August 2018, Pfizer signed an agreement with BioNTech to conduct joint research and development activities regarding mRNA-based influenza vaccines. In October 2018, effective January 1, 2019, Albert Bourla was promoted to chief executive officer, succeeding Ian Read, his mentor.
In July 2019, the company acquired Therachon for up to $810 million, expanding its rare disease portfolio through Therachon's recombinant human fibroblast growth factor receptor 3 compound, aimed at treating conditions such as achondroplasia. Also in July, Pfizer acquired Array Biopharma for $10.6 billion, boosting its oncology pipeline. In August 2019, Pfizer merged its consumer health business with that of GlaxoSmithKline, into a joint venture owned 68% by GlaxoSmithKline and 32% by Pfizer, with plans to make it a public company. The transaction built on a 2018 transaction where GlaxoSmithKline acquired Novartis' stake in the GSK-Novartis consumer healthcare joint business. The transaction followed negotiations with other companies including Reckitt Benckiser, Sanofi, Johnson & Johnson, and Procter & Gamble. In September 2019, Pfizer initiated a study with the CDC Foundation to investigate the tracking of healthcare-associated infections, scheduled to run through to June 2023. In December 2019, Pfizer awarded the CDC Foundation a further $1,948,482 to continue its cryptococcal disease screening and treatment research in nine African countries.
On November 9, 2020, Pfizer announced that BioNTech's COVID-19 vaccine, tested on 43,500 people, was found to be 90% effective at preventing symptomatic COVID-19. The efficacy was updated to 95% a week later. Akiko Iwasaki, an immunologist interviewed by The New York Times, described the efficacy figure as "really a spectacular number." The announcement made Pfizer and BioNTech the first companies to develop and test a working vaccine for COVID-19.
Over the following month and a half, regulators in various countries approved Pfizer's vaccine for emergency use.
In February 2021, after a year long investigation relying on unnamed officials, Pfizer was accused by The Bureau of Investigative Journalism (TBIJ) of employing "high-level bullying" against at least two Latin American countries during negotiations to acquire COVID-19 vaccines, including requesting that the countries put sovereign assets as collateral for payments. According to TBIJ, these negotiation tactics resulted in a months long delay in Pfizer reaching a vaccine agreement with one country and a complete failure to reach agreements with two other countries, including Argentina and Brazil.
In November 2021, Pfizer launched a new COVID-19 oral antivirus treatment known as Paxlovid. In January 2022, the Pfizer CEO Albert Bourla confirmed that the trial results of a fourth dose were pending until March 2022. He said that the firm was setting up a collaboration to develop an anti-COVID pill treatment along with a French company, Novasep. He also said the COVID vaccine was "safe and efficient" for children. In May 2022, reports emerged of patients experiencing "rebound" symptoms after completing a five-day course of Paxlovid. The FDA responded by announcing they had performed additional analyses of the drug's clinical trial data, and decided against changing its recommendations. U.S. President Joe Biden and Dr. Anthony Fauci were both reported to experience this rebound syndrome in the months that followed, while continuing to recommend the drug for those who may benefit from it.
In September 2020, the company acquired a 9.9% stake in CStone Pharmaceuticals for $200 million (HK$1.55 billion), helping to commercialise its anti-PD-L1 monoclonal antibody, CS1001. In October 2020, the company acquired Arixa Pharmaceuticals. In November 2020, using a Reverse Morris Trust structure, Pfizer merged its off-patent branded and generic drug business, known as Upjohn, with Mylan to form Viatris, owned 57% by Pfizer shareholders.
On Sept 30, 2024, Pfizer announced its intentions to sell 540 million Haleon shares whose worth is about £2.1 billion ($2.8 billion) according to Bloomberg calculations.
In the third quarter of 2024, Pfizer reported $17.7 billion in revenue, a 32% year-over-year increase, driven by Paxlovid ($2.7 billion) and Comirnaty ($1.4 billion). Excluding COVID-19 products, core revenue grew 14% to $13.6 billion, led by Vyndaqel sales (up 63%) and $854 million from legacy Seagen products. The company raised its 2024 revenue guidance to $61.0–$64.0 billion and adjusted diluted earnings per share to $2.75–$2.95. Pfizer remains on track for $5.5 billion in cost savings, with $4 billion expected by 2024 and $1.5 billion by 2027. Reported diluted earnings per share was $0.78, and adjusted diluted earnings per share was $1.06. The company ranks 69th on the Fortune 500 of the same year.
In July 2024, Pfizer and Flagship Pioneering announced an "Innovation Supply Chain" partnership to co-develop 10 drug candidates. Each party committed $50 million upfront, leveraging Flagship’s ecosystem of over 40 startups to align with Pfizer’s priorities. Pfizer will fund the selected programs and has the option to license or acquire assets, with potential success milestones and royalties reaching up to $700 million per commercialized drug. Two programs, focused on obesity and cardiovascular diseases, have already been initiated.
The partnership represents a new model in pharmaceutical R&D, focusing on early collaboration with startups to streamline drug development. For startups, the model provides an opportunity for early engagement with pharmaceutical companies, offering potential funding and reduced uncertainty in development programs.
In October 2024, Pfizer announced a partnership with the Ignition AI Accelerator, a collaborative initiative by NVIDIA, Tribe, and Digital Industry Singapore (DISG). The collaboration aims using artificial intelligence to expedite drug discovery and development processes, improve operational efficiency, and streamline stakeholder engagement. The initiative also focuses on optimizing manufacturing processes, including improving yields and reducing cycle times.
Saama and Pfizer reached an expanded multi-year agreement to integrate AI-driven solutions across Pfizer's R&D portfolio, building on their 2020 partnership. Initially the partnership focused on automating data review processes with the Smart Data Quality (SDQ) platform — developed during Pfizer’s COVID-19 vaccine trials — the partnership as of 2024 scales to streamline data review and accelerate regulatory submissions across global studies. The expanded collaboration introduces Saama’s Biometrics Research and Analysis Information Network, enabling faster statistical programming, biostatistics workflows, and submission-ready outputs.
Pfizer focuses on addressing critical health challenges through innovation in various therapeutic areas. In the field of rare diseases, the company develops treatments for conditions such as Duchenne muscular dystrophy, hemophilia, sickle cell disease, and Gaucher disease, with an inclination on gene therapy and improving diagnostic resources for patients with unmet medical needs.
Pfizer has a longstanding history in vaccines, contributing to breakthroughs in diseases like polio and smallpox. Currently, the company focuses on vaccines for pneumococcal and meningococcal diseases, influenza, respiratory syncytial virus (RSV), Lyme disease, and Clostridioides difficile. It also invests in maternal and neonatal vaccines, cancer prevention, and efforts to mitigate hospital-acquired infections. It also works in advancing therapies for issues related to metabolic and cardiovascular health, including obesity, type 2 diabetes, insulin resistance, and non-alcoholic fatty liver disease (NAFLD).
Dose optimization trials are planned for late 2024 to support large-scale registration studies.
Pfizer develops targeted therapies to treat multiple cancer types, including bladder, breast, cervical, lung, and colorectal cancers, as well as hematological malignancies. The company conducts research on precision medicine and immunotherapy, aiming to improve survival rates and quality of life for cancer patients. Specially, the acquisition of Seagen has supported further development of oncology treatments, including mRNA cancer vaccines.
Pfizer has also started initiatives which aim to address healthcare challenges across various regions and therapeutic areas in advancements in artificial intelligence (AI), gene therapy, obesity treatments, and oncology research. In 2023, Pfizer’s affordability and access programs reached 45 million patients in the MERA region, supported by the IUdo app, which was launched in Egypt, Qatar, and Lebanon to facilitate patient access to care. In 2024, Pfizer focuses on integrating AI and gene therapy in the Middle East, Russia, and Africa (MERA) region, with its headquarters in Dubai. Key initiatives include:
Pfizer purchased Shiley in 1979, at the onset of its Convexo-Concave valve ordeal, involving the Bjork–Shiley valve. Approximately 500 people died when defective heart valves fractured and, in 1994, Pfizer agreed to pay $10.75 million to settle claims by the United States Department of Justice that the company lied to get approval for the valves.
A federal lawsuit was filed by a scientist claiming she got an infection by a genetically modified lentivirus while working for Pfizer, resulting in intermittent paralysis. A judge dismissed the case citing a lack of evidence that the illness was caused by the virus but the jury ruled that by firing the employee, Pfizer violated laws protecting freedom of speech and whistleblowers and awarded her $1.37 million.
In 1996, an outbreak of measles, cholera, and bacterial meningitis occurred in Nigeria. Pfizer representatives and personnel from a contract research organization (CRO) traveled to Kano to set up a clinical trial and administer an experimental antibiotic, trovafloxacin, to approximately 200 children. Tests in animals showed that Trovan had life-threatening side effects, including joint disease, abnormal cartilage growth, liver damage, and a degenerative bone condition. Pfizer’s representatives did not alert the parents or patients about the serious risks involved, or tell them about an effective conventional treatment that Doctors without Borders was providing at the same site. Local Kano officials reported that more than fifty children died in the experiment, while many others developed mental and physical deformities such as blindness, deafness, paralysis, and brain damage. The nature and frequency of both fatalities and other adverse outcomes were similar to those historically found among pediatric patients treated for meningitis in sub-Saharan Africa. In 2001, families of the children, as well as the governments of Kano and Nigeria, filed lawsuits regarding the treatment. According to Democracy Now!, "[r]esearchers did not obtain signed consent forms, and medical personnel said Pfizer did not tell parents their children were getting the experimental drug." The lawsuits also accused Pfizer of using the outbreak to perform unapproved human testing, as well as allegedly under-dosing a control group being treated with traditional antibiotics in order to skew the results of the trial in favor of Trovan. Nigerian medical personnel as well as at least one Pfizer physician said the trial was conducted without regulatory approval.
In 2007, Pfizer published a Statement of Defense letter, stating that the drug's oral form was safer and easier to administer. Trovan had been used safely in more than five thousand Americans prior to the Nigerian trial, and mortality in the patients treated by Pfizer was lower than that observed historically in African meningitis epidemics. No unusual side effects, unrelated to meningitis, were observed after four weeks.
In June 2010, the US Supreme Court rejected Pfizer's appeal against a ruling allowing lawsuits by the Nigerian families to proceed.
The lawsuits were eventually settled out of court. Pfizer committed to paying US$35 million "to compensate the families of children in the study", another $30 million to "support healthcare initiatives in Kano", and $10 million to cover legal costs. Payouts began in 2011.
In July 2022, UK antitrust authorities fined Pfizer £63 million for unfairly high priced drug that aids in controlling epileptic seizures. The Competition and Markets Authority stated that the company took advantage of loopholes by de-branding epilepsy drug Epanutin, by doing so the price of Epanutin's price was not regulated to the same standards the company are used to and therefore the price of the drug was raised. It was stated that over a four-year period, Pfizer had billed Epanutin for around 780% and 1,600% higher than its standard price.
As several media outlets note, Pfizer's role in global healthcare provides it with some insulation from international tariff disputes, as pharmaceutical products are generally exempt from tariffs under international trade agreements and governmental trade policies. Per The Wall Street Journal, Health Care Industry and Consumer staples are among the least impacted. In February 2025, Pfizer’s CEO Albert Bourla emphasized the company’s ability to mitigate potential future tariffs by shifting manufacturing to its 13 U.S. facilities, including large-scale sites dedicated to sterile injectables and antibody production.
In June 2002, a chemical explosion at the Groton plant injured 7 people and caused the evacuation of more than 100 homes in the surrounding area.
Pfizer sponsored a presentation in January 2020 delivered by Julie Bettinger through British Columbia's Provincial Health Services Authority (PHSA) titled "Vaccine hesitancy: It doesn't matter if the vaccine works if nobody gets it."
Pfizer has partnered with and sponsored many medical research networks and professional associations in the United States, Canada and globally:
The Pfizer Award, established in 1958 by Pfizer, Inc., recognizes exceptional books on the history of science. The prize includes a medal and $2,500. Eligible books must be published in English within the three years preceding the competition year (e.g., for 2024, books from 2021–2023). Edited volumes and books with more than two authors are excluded, though multi-volume works by one or two authors may qualify once all volumes are published. While books with themes in medicine or technology may be considered, the award prioritizes works focused on the history of science. The prize is not divided between multiple books.
The Royal Society Pfizer Award, established in 2006 with support from Pfizer Inc., recognized African research scientists contributing innovatively to biological and basic medical sciences, with a focus on capacity building in Africa. Recipients received a bronze medal, £1,000, and an £11,000 research grant for a project affiliated with an African scientific institution, such as a university or research center. The award was last presented in 2016 and has since been replaced by the Royal Society Africa Prize.
The Pfizer Foundation, established in 1953, is a charitable organization dedicated to building healthier communities worldwide. It operates independently of Pfizer Inc., with its mission centered on addressing global health challenges, supporting urgent health needs, and empowering Pfizer employees to create meaningful impacts in their communities.
The foundation also supports specific initiatives such as improving breast cancer care in Rwanda, empowering women and driving progress through Integrated Health Services in Benin, addressing vaccine access for zero-dose children in Nigeria, and collaborating with organizations like Direct Relief to strengthen healthcare providers in the United States.
Pfizer has received numerous accolades and recognitions worldwide for its efforts in fostering an inclusive and equitable work environment beside the pharmaceutical activities.
Pfizer has introduced PfizerForAll, a digital platform designed to streamline access to healthcare and wellness resources in the United States. The platform supports individuals with common conditions like the flu, COVID-19, and migraines, as well as those seeking adult vaccinations. It integrates services such as same-day access to healthcare professionals, home delivery of prescriptions and diagnostic tests, appointment scheduling, and financial assistance for Pfizer medications. Partnering with organizations like UpScriptHealth, Alto Pharmacy, and Instacart, PfizerForAll aims to simplify tasks like prescription fulfillment and accessing savings programs. Pfizer plans to expand the platform to address a wider range of healthcare needs and enhance user experience.
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