Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549   FORM 8-K     CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act   Date of Report (Date of Earliest Event Reported): July 21, 2021   Cal-Maine Foods, Inc. (Exact name of registrant as specified in its charter)   Delaware 001-38695 64-0500378 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.)     1052 Highland Colony Pkwy , Suite 200   Ridgeland , MS 39157 (Address of principal executive offices (zip code))   601 - 948-6813 (Registrant’s telephone number, including area code)   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, $0.01 par value per share CALM The NASDAQ   Global Select Market     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 8.01.   Other Events   On July 20, 2021, Cal-Maine Foods, Inc.   (the “Company”) issued a press release   announcing that the Company has published   its 2020 Sustainability Overview. The   full report may   be found on   the Company’s website   at www.calmainefoods.com. A copy of the Company’s press release is attached hereto as Exhibit 99.1 to this Current Report.   Item 9.01.   Financial Statements and Exhibits   (d)   Exhibits Exhibit Number Description 99.1 Press Release issued by the Company on July 21, 2021 104 Cover Page Interactive Data File, (embedded within the Inline XBRL document)   SIGNATURES   Pursuant to the requirements for 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.           CAL-MAINE FOODS, INC. Date: July 21, 2021 By:   /s/ Max P. Bowman   Max P. Bowman   Director, Vice President, and Chief Financial Officer