Reg FD Disclosure

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): December 13, 2023 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 obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communication 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 7.01.     Regulation FD Disclosure. On December 13, 2023, Pfizer Inc. issued a press release that provided its full-year 2024 guidance. A copy of the press release is furnished as Exhibit 99.1 hereto and is incorporated herein by reference. The information furnished pursuant to this “Item 7.01 – Regulation FD Disclosure”, including Exhibit 99.1, shall not be deemed to be “filed” for the purposes of Section 18 of the Exchange Act or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any filing made by us under the Exchange Act or the Securities Act, regardless of any general incorporation language in any such filing, except as shall be expressly set forth by specific reference in such filing. Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit No. Exhibit Description Exhibit 99.1 Press Release of Pfizer Inc. dated December 13, 2023. 104 Cover Page Interactive Data File--the cover page XBRL tags are embedded within the Inline XBRL document. 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.               By: /s/ Margaret M. Madden   Margaret M. Madden     Senior Vice President and Corporate Secretary     Chief Governance Counsel       Dated: December 13, 2023