Results of Operations

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): April 21, 2026   SONOCO PRODUCTS COMPANY   Commission File No. 001-11261   South Carolina 57-0248420 (State or other jurisdiction of incorporation) (IRS Employer Identification No.) 1 N. Second St. Hartsville , South Carolina 29550 (Address of principal executive offices)(Zip Code) ( 843 ) 383-7000 (Registrant's telephone number, including area code) (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: ☐ 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 No par value common stock SON 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 pursuant to Section 13(a) of the Exchange Act. ☐ Item 2.02      Results of Operations and Financial Condition. On April 21, 2026, Sonoco Products Company (the "Company") issued a news release reporting its financial results for the quarter ended March 29, 2026. The Company also provided guidance for the full year 2026. A co py of that release is attached as an exhibit hereto. Item 9.01      Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description of Exhibit 99 Registrant's F i rst Quarter 202 6 Earnings Release 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) SIGNATURE 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.   SONOCO PRODUCTS COMPANY Date: April 21, 2026 By: /s/ Paul Joachimczyk Paul Joachimczyk Chief Financial Officer