PFIZER INC

For information about our effective tax rate and the events and circumstances contributing to the changes between periods, as well as details about discrete elements that impacted our tax provisions, see Note 5. See Note 5Ain our 2025 Form 10-K for information on our income taxes paid (net of refunds received).

Changes in Tax Laws––Many countries outside the U.S. have enacted legislation for global minimum taxation resulting from the Organization for Economic Co-operation and Development’s (OECD) Base Erosion and Profit Shifting “Pillar 2” project. The provisions are generally effective for Pfizer since 2024, though significant details and guidance around the provisions are still pending. Income tax expense could be impacted as the legislation becomes effective in countries in which we do business, and such impact could be material to our results of operations. We continue to monitor pending OECD guidance and legislation enactment and implementation by individual countries.

On July 4, 2025, the OBBBA was enacted into law in the U.S. The OBBBA includes significant tax provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act and modifications to the U.S. international tax framework. Among the favorable business provisions are the permanent expensing for domestic R&D costs, permanent bonus depreciation, full expensing of qualified production property, and the reduction of the tax rate applicable to foreign earnings as GILTI (now NCTI) effective in fiscal years 2026 and thereafter from 13.125% to 12.6%. The legislation includes various effective dates, with certain provisions effective in 2025 and the rest in 2026. We expect further guidance may be issued by the U.S. government with respect to certain OBBBA tax provisions.

See the Provision/(Benefit) for Taxes on Income section within MD&A of our 2025 Form 10-K for more information.

PRODUCT DEVELOPMENTS

A comprehensive update of Pfizer’s development pipeline was published as of August 4, 2026 and is available atwww.pfizer.com/science/drug-product-pipeline. It includes an overview of our research and a list of compounds in development with targeted indication and phase of development, as well as mechanism of action for some candidates in Phase 1 and all candidates from Phase 2 through registration.

This section provides information as of the date of this report about significant marketing application-related regulatory actions by, and filings submitted to and accepted by the FDA and the EMA since the filing of our Annual Report on Form 10-K for the year ended December 31, 2025.

Approvals:

(a) Vepdegestrant is being developed in collaboration with Arvinas, Inc. In May 2026, Arvinas and Pfizer jointly agreed to out-license the commercialization rights to vepdegestrant to Rigel Pharmaceuticals, Inc.

(b) Erbitux® is a registered trademark of ImClone LLC. We have exclusive rights to Braftovi in the U.S., Canada and certain emerging markets. Pierre Fabre Medicament SAS has exclusive rights to commercialize Braftovi in Europe and Ono Pharmaceutical Co., Ltd. has exclusive rights to commercialize Braftovi in Japan.

(c) Ibrance for metastatic breast cancer is being developed in collaboration with Alliance Foundation Trials, LLC.

(d)Padcev is being jointly developed and commercialized with Astellas in the U.S. Outside the U.S., we have commercialization rights in all countries in North and South America, and Astellas has commercialization rights in the rest of the world.

(e)Comirnaty is being developed and commercialized with BioNTech.

Regulatory Filings:

^ For the U.S., the filing date is the date on which the FDA accepted our submission. For the EU, the filing date is the date on which the EMA validated our submission.

(a) Padcev is being jointly developed and commercialized with Astellas in the U.S. Outside the U.S., we have commercialization rights in all countries in North and South America, and Astellas has commercialization rights in the rest of the world.

(b) Comirnaty is being developed and commercialized with BioNTech.

The following provides updates about additional indications and new drug candidates in late-stage development since the filing of our Annual Report on Form 10-K for the year-ended December 31, 2025:

(a) Padcev is being jointly developed and commercialized with Astellas in the U.S. Outside the U.S., we have commercialization rights in all countries in North and South America, and Astellas has commercialization rights in the rest of the world.

As discussed in our 2025 Form 10-K, in September 2024, Pfizer announced a voluntary withdrawal of all lots of Oxbryta (voxelotor) for the treatment of SCD in all markets where it was approved. Pfizer also discontinued all active voxelotor clinical trials and expanded access programs worldwide. Pfizer’s decision was based on the totality of the clinical trial and registry data available at the time.

Following comprehensive review and analysis of the totality of the data, Pfizer submitted updated analyses to the EMA, FDA and other regulators. In the EU, the EMA’s referral procedure concluded in October 2025, with the EMA adopting a negative opinion on benefit-risk for Oxbryta for the treatment of hemolytic anemia due to SCD, recommending that the marketing authorization for the product remain suspended. In July 2026, Pfizer engaged with the FDA to discuss the FDA’s assessment of the data and it was determined that there is no viable pathway for returning Oxbryta to market in the U.S. Consistent with the FDA’s recommendation, on July 31, 2026, Pfizer notified the FDA that it is voluntarily withdrawing the NDAs for Oxbryta.

In December 2024, the FDA issued a partial clinical hold for osivelotor, which prohibited Pfizer from enrolling new participants into osivelotor clinical studies. The FDA has since permitted initiation of osivelotor studies and confirmed enrollment may proceed outside of sub-Saharan Africa and for participants who have not relocated from sub-Saharan Africa within the last six months. Enrollment of new participants began in the first quarter of 2026.

In June 2026, we announced topline results from the Phase 3 SigVie-002 study evaluating sigvotatug vedotin, an investigational antibody-drug conjugate, in patients with previously treated, locally advanced, unresectable or metastatic non-squamous NSCLC. The study did not meet its primary endpoint of a statistically significant improvement in overall survival compared to docetaxel. The safety profile of sigvotatug vedotin was manageable and consistent with prior studies.

For additional information about our R&D organization, see Note 13 and the Item 1. Business—Research and Development section of our 2025 Form 10-K. For additional information regarding certain collaboration arrangements, see the Item 1. Business—Collaboration and Co-Promotion Agreements section of our 2025 Form 10-K. For additional information about additional indications and new drug candidates in late-stage development and filings pending with certain regulatory authorities, see the Product Developments section within MD&A of our 2025 Form 10-K.