Results of Operations · Reg FD Disclosure

U NITED S TATES S ECURITIES AND E XCHANGE C OMMISSION W ASHINGTON , 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): February 25, 2026     C HESAPEAKE U TILITIES C ORPORATION (Exact name of registrant as specified in its charter)     DE   001-11590   51-0064146 (State or other jurisdiction of   (Commission   (I.R.S. Employer incorporation or organization)   File Number)   Identification No.) 500 Energy Lane , Dover , DE 19901 (Address of principal executive offices, including Zip Code) ( 302 ) 734-6799 (Registrant's Telephone Number, including Area Code)   (Former name, former address and former fiscal year, if changed since last report.)     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 - par value per share $0.4867 CPK New York Stock Exchange, Inc. 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))   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. ☐ Explanatory Note Item 2.02. Results of Operations and Financial Condition. On February 25, 2026, Chesapeake Utilities Corporation issued a press release announcing its financial results for quarter and year ended December 31, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and is incorporated by reference herein. Item 7.01. Regulation FD Disclosure. On February 25, 2026, Chesapeake Utilities Corporation posted a presentation that will be used during its conference call on February 26, 2026, to discuss the Company’s financial results for the quarter and year ended December 31, 2025, on its website (www.chpk.com) under the “Investors” section. This presentation is being furnished as Exhibit 99.2 to this Current Report on Form 8-K. Item 9.01. Financial Statements and Exhibits. (d)  Exhibits Exhibit 99.1 - Press Release of Chesapeake Utilities Corporation, dated February 25, 2026. Exhibit 99.2 - Fourth Quarter 2025 Earnings Call Presentation 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.   C HESAPEAKE U TILITIES C ORPORATION /s/ Beth W. Cooper Beth W. Cooper Executive Vice President, Chief Financial Officer, Treasurer, and Assistant Corporate Secretary Date: February 25, 2026