Company Update

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): May 4, 2026 ​ ​ ​ ​ ​ ​ ​ ​ Commission File Number   ​ ​ ​ Exact Name of Registrant as specified in its charter   ​ ​ ​ State or Other Jurisdiction of Incorporation or Organization   ​ ​ ​ IRS Employer Identification Number 1-2313 ​ SOUTHERN CALIFORNIA EDISON COMPANY ​ California ​ 95-1240335 ​ ​ ​ ​ 2244 Walnut Grove Avenue ( P.O. Box 800 ) Rosemead , California 91770 (Address of principal executive offices) ( 626 ) 302-1212 ​ (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: [ ☐ ] 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: None 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 May 4, 2026, Southern California Edison Company (SCE) agreed to sell $500,000,000 principal amount of its 4.95% First and Refunding Mortgage Bonds, Series 2026B, Due 2031. For further information concerning the bonds, refer to the exhibits attached to this report. ​ Item 9.01             Financial Statements and Exhibits (d)         Exhibits See the Exhibit Index below. EXHIBIT INDEX ​ ​ ​ Exhibit No .   ​ ​ ​ Description ​ ​ ​ 1.1 ​ Underwriting Agreement dated May 4, 2026 ​ ​ ​ 4.1 ​ One Hundred Sixty-Third Supplemental Indenture dated May 5, 2026 ​ ​ ​ 4.2 ​ Certificate as to Actions Taken by Officer of Southern California Edison Company, dated as of May 4, 2026 ​ ​ ​ 5.1 ​ Opinion of Counsel ​ ​ ​ 104 ​ Cover Page Interactive Data File (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. ​ ​ ​ SOUTHERN CALIFORNIA EDISON COMPANY ​ (Registrant) ​ ​ ​ /s/ Kara G. Ryan ​ Kara G. Ryan ​ Vice President, Chief Accounting Officer and Controller ​ ​ Date: May 7, 2026 ​ ​ ​ ​ ​ ​