Company Update

UNITED STATES   SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549   FORM 8-K/A   (Amendment No. 1)    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 20, 2026   ELECTRO-SENSORS, INC.     (Exact name of Registrant as Specified in its Charter)   Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.)   6111 Blue Circle Drive   Minnetonka , Minnesota 55343-9108 (Address of Principal Executive Offices)   (952) 930-0100     (Registrant’s telephone number, including area code)   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 ELSE Nasdaq Capital Market   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))   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).   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   This Current Report on Form 8-K/A is being filed solely to include exhibits to the Current Report on Form 8-K filed by Electro-Sensors, Inc. on April 24, 2026.   Item 9.01. Financial Statements and Exhibits   (c) Exhibits:   Exhibit   Description 2.1*   Agreement and Plan of Merger, dated April 20, 2026 10.1   Form of Support Agreement 104   Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document.   * Certain exhibits and schedules to this Exhibit have been omitted in accordance with Item 601(a)(5) of Regulation S-K. The Company agrees to furnish supplementally a copy of any omitted exhibit and schedule to the SEC upon its request.   SIGNATURES   Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.     ELECTRO-SENSORS, INC.       Date: April 27, 2026 By: /s/ David L. Klenk     David L. Klenk     Chief Executive Officer and Chief Financial Officer