Executive Change

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C.  20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): July 9, 2024 PFIZER INC . (Exact name of registrant as specified in its charter) Delaware 1-3619 13-5315170 (State or other (Commission File (I.R.S. Employer jurisdiction of Number) Identification No.) incorporation)     66 Hudson Boulevard East 10001-2192 New York, New York (Zip Code) (Address of principal executive offices) Registrant’s telephone number, including area code: ( 212 ) 733-2323 (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, $.05 par value PFE New York Stock Exchange 1.000% Notes due 2027 PFE27 New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company     ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.      ☐ Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On July 9, 2024, Pfizer Inc. (the "Company") announced that it is beginning the process of finding a successor for Dr. Mikael Dolsten, the Company’s Chief Scientific Officer and President, Pfizer Research & Development after his more than 15-year distinguished career with the Company. The Company has initiated an external search for a new Chief Scientific Officer. Dr. Dolsten will continue to serve in his current position until his successor is in place and any necessary transition is complete. It is anticipated that Dr. Dolsten will remain with Pfizer through at least February 28, 2025. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.   PFIZER INC.             Dated: July 10, 2024 By: /s/ Margaret M. Madden   Margaret M. Madden     Senior Vice President and Corporate Secretary     Chief Governance Counsel