PFIZER INC

To the Board of Directors and Shareholders

Pfizer Inc.:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Pfizer Inc. and Subsidiary Companies (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive income, equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control-Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 27, 2025 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the consolidated financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Evaluation of the U.S. Medicare, Medicaid, and performance-based contract rebates accrual

As discussed in Note 1G to the consolidated financial statements, the Company records estimated deductions for Medicare, Medicaid, and performance-based contract rebates (collectively, U.S. rebates) as a reduction to gross product revenues. The accrual for U.S. rebates is recorded in the same period that the corresponding revenues are recognized. The length of time between when a sale is made and when the U.S. rebate is paid by the Company can be as long as one year, which increases the need for significant management judgment and knowledge of market conditions and practices in estimating the accrual.

We identified the evaluation of the U.S. rebates accrual as a critical audit matter because the evaluation of the product-specific experience ratio assumption involved especially challenging auditor judgment. The product-specific experience ratio assumption relates to estimating which of the Company’s revenue transactions will ultimately be subject to a related rebate.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s U.S. rebates accrual process related to the development of the product-specific experience ratio assumptions. We estimated the U.S. rebates accrual using internal information and historical data and compared the result to the Company’s estimated U.S. rebates accrual. We evaluated the Company’s ability to accurately estimate the accrual for U.S. rebates by comparing historically recorded accruals to the actual amount that was ultimately paid by the Company.

Evaluation of gross unrecognized tax benefits

As discussed in Notes 5D and 1Q, the Company’s tax positions are subject to audit by local taxing authorities in each respective tax jurisdiction, and the resolution of such audits may span multiple years. Since tax law is complex and often subject to varied interpretations and judgments, it is uncertain whether some of the Company’s tax positions will be sustained upon audit. As of December 31, 2024, the Company has recorded gross unrecognized tax benefits, excluding associated interest, of $4.5 billion.

We identified the evaluation of certain of the Company’s gross unrecognized tax benefits as a critical audit matter because a high degree of audit effort, including specialized skills and knowledge, and complex auditor judgment was required in evaluating the Company’s interpretation of tax law and its estimate of the ultimate resolution of its tax positions.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of an internal control over the Company’s liability for unrecognized tax position process related to (1) interpretation of tax law, (2) evaluation of which of the Company’s tax positions may not be sustained upon audit, and (3) estimation and recording of the gross unrecognized tax benefits. We involved tax and valuation professionals with specialized skills and knowledge who assisted in evaluating the Company’s interpretation of tax laws, including the assessment of transfer pricing practices in accordance with applicable tax laws and regulations. We inspected settlements with applicable taxing authorities, including assessing the expiration of statutes of limitations. We tested the calculation of the liability for uncertain tax positions, including an evaluation of the Company’s assessment of the technical merits of tax positions and estimates of the amount of tax benefits expected to be sustained.

Evaluation of product liability and other product-related litigation

As discussed in Notes 1S and 16 to the consolidated financial statements, the Company is involved in product liability and other product-related litigation, which can include personal injury, consumer fraud, off-label promotion, securities, antitrust and breach of contract claims, among others. Certain of these pending product and other product-related legal proceedings could result in losses that could be substantial. The accrued liability and/or disclosure for the pending product liability and other product-related legal proceedings requires a complex series of judgments by the Company about future events, which involves a number of uncertainties.

We identified the evaluation of product liability and other product-related litigation as a critical audit matter. Challenging auditor judgment was required to evaluate the Company’s judgments about future events and uncertainties.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s product liability and other product-related litigation processes, including controls related to (1) the evaluation of information from external and internal legal counsel, (2) forward-looking expectations, and (3) new legal proceedings, or other legal proceedings not currently reserved or disclosed. We read letters received directly from the Company’s external and internal legal counsel that described the Company’s probable or reasonably possible legal contingency to pending product liability and other product-related legal proceedings. We inspected the Company’s minutes from meetings of the Audit Committee, which included the status of key litigation matters. We evaluated the Company’s ability to estimate its monetary exposure to pending product and other product-related legal proceedings by comparing historically recorded liabilities to actual monetary amounts incurred upon resolution of prior legal matters. We analyzed relevant publicly available information about the Company, its competitors, and the industry.

Evaluation of the fair value measurement of the developed technology rights and in-process research and development intangible assets acquired in the Seagen business combination

As discussed in Note 2A to the consolidated financial statements, on December 14, 2023, the Company acquired Seagen Inc. and its subsidiaries (Seagen). The total fair value of consideration transferred was $44.2 billion. Of that, the Company recorded $7.5 billion of developed technology rights with an estimated weighted-average life of approximately 18 years and $19.9 billion of in-process research and development (IPR&D). The preliminary estimates of the fair value of intangible assets were finalized during the measurement period in 2024. As discussed in Note 1 M, the Company performs impairment testing for indefinite-lived intangible assets at least annually and for all other long-lived assets whenever impairment indicators are present. When necessary, the Company records impairments of long-lived assets for the amount by which the fair value is less than the carrying value of these assets.

We identified the evaluation of the fair value measurement of Seagen acquired developed technology rights and IPR&D as a critical audit matter. A high degree of subjective auditor judgment was required to evaluate certain key assumptions used to estimate the acquisition-date fair value of the acquired developed technology rights and IPR&D, as well as the fair value for impairment testing purposes. Specifically, the key assumptions for certain IPR&D assets, including revenue growth rates, probability of technical and regulatory success (PTRS) rates, and the discount rate, and the key assumptions for certain developed technology rights, including revenue growth rates and the discount rate, represented subjective determinations of future market and economic conditions. Changes to those assumptions could have had a significant effect on the determination of the fair value measurements.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls related to the Company’s valuation process, including controls related to the development of the key assumptions for certain IPR&D assets and developed technology rights. We performed sensitivity analyses over the key assumptions for certain IPR&D assets and developed technology rights to assess the impact of changes in those key assumptions on the Company’s determination of the fair value of the IPR&D and developed technology rights, respectively. We evaluated the reasonableness of the Company’s forecasted revenue growth rates by comparing them to historical results, comparable products and peer companies, analyst expectations, industry related third-party data, and the assumptions used in prior periods. Further, we evaluated the PTRS rates for certain IPR&D assets by considering the phase of development of the clinical projects and the Company's history of obtaining regulatory approval and comparing them to PTRS rates derived from analyst reports and other industry related third-party data and the assumptions used in prior periods. We evaluated the data sources used by management in determining the key assumptions for certain IPR&D assets and developed technology rights by comparing to industry standards and evidence obtained in other areas of the audit. In addition, we involved valuation professionals with specialized skills and knowledge, who assisted in:

(1) evaluating the discount rates used by the Company for certain IPR&D and developed technology rights by comparing them against discount rate ranges that were independently developed using publicly available market data for comparable entities

(2) testing the source information underlying the determination of the discount rates.

We have not been able to determine the specific year that we or our predecessor firms began serving as the Company’s auditor, however, we are aware that we or our predecessor firms have served as the Company’s auditor since at least 1942.

New York, New York

February 27, 2025

Consolidated Statements of Operations

(a)See Note 1A.

(b)Exclusive of amortization of intangible assets.

(c)See Note 17A.

Consolidated Statements of Comprehensive Income

(a)Reclassified into Other (income)/deductions—netand Cost of sales. See Note 7E.

(b)Reclassified into Other (income)/deductions—net.