Shareholder Vote

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 22, 2026 ​ Seaboard Corporation (Exact name of registrant as specified in its charter) ​ ​ ​ ​ ​ Delaware ​ 1-3390 ​ 04-2260388 (State or other jurisdiction of ​ (Commission ​ (I.R.S. Employer incorporation) ​ File Number) ​ Identification No.) ​ ​ ​ 9000 West 67th Street , Merriam , Kansas 66202 (Address of principal executive offices) (Zip Code) ​ ​ ​ Registrant’s telephone number including area code ( 913 ) 676-8928 ​ Not Applicable (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 Common Stock $1.00 Par Value SEB NYSE American 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 5.07 Submission of Matters to a Vote of Security Holders Seaboard Corporation (the “Company”) held its annual meeting of stockholders on April 20, 2026 in Overland Park, Kansas. Three items were submitted to a vote as described in the Company’s Proxy Statement filed March 6, 2026. The following briefly describes the proposals and results of the stockholders’ votes. ​ ​ ​ ​ Votes in Votes ​ Favor Withheld 1. Election of the following persons as directors: ​ ​ Ellen S. Bresky 811,128 89,934 David A. Adamsen 868,325 32,737 Douglas W. Baena 887,150 13,912 Paul M. Squires 817,580 83,482 Frances B. Shifman 893,965  7,097 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Votes in Votes Votes ​ Favor Against Abstaining ​ ​ ​ ​ 2. Vote to approve the compensation, on an advisory basis, of the Named 832,490 66,062 2,510 Executive Officers, as disclosed in the proxy statement for the 2026 ​ ​ ​ Annual Meeting of Stockholders: ​ ​ ​ ​ ​ ​ ​ 3. Ratification and approval of the selection of KPMG LLP 929,204  1,502  526 as independent auditors for 2026: ​ ​ ​ ​ ​ There were 30,170 broker non-votes with respect to the election of directors and compensation of Named Executive Officers. There were 0 broker non-votes with respect to the selection of independent auditors. ​ ​ ​ ​ 2 ​ ​ 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 thereunto duly authorized. ​ ​ ​ ​ ​ ​ ​ ​ Date: April 22, 2026 ​ ​ ​ ​ ​ ​ ​ ​ Seaboard Corporation ​ ​ ​ ​ (Registrant) ​ ​ ​ ​ ​ ​ ​ ​ By: /s/ David H. Rankin ​ ​ ​ ​ David H. Rankin Executive Vice President, Chief Financial Officer ​ ​ ​ ​ ​ (principal financial officer) ​ ​ ​ ​ ​ 3