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 of 1934 Date of Report (Date of earliest event reported): March 4, 2026 BARNWELL INDUSTRIES, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5103 72-0496921 (State or other jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.) 24 Greenway Plaza , Suite 1800Q Houston , Texas 77046 (Address of Principal Executive Offices) (Zip Code) ( 713 ) 730-7026 (Registrant’s Telephone Number, Including Area Code) 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, $0.50 Par Value BRN NYSEAMER 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 March 4, 2026, Barnwell Industries, Inc. (the “Company”) issued a press release highlighting key operational results from its recently filed Quarterly Report on Form 10-Q for the first quarter of fiscal year 2026 and emphasizing the continued performance and reliability of the Company’s Canadian oil production during the winter operating season. A copy of the press release is attached as Exhibit 99.1 hereto and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits Exhibit No. Description     99.1 Press release dated March 4, 2026     104 Cover Page Interactive Data File (embedded within the Inline XBRL document)   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. Dated: March 9, 2026 BARNWELL INDUSTRIES, INC.   By: /s/ Philip F. Patman   Name: Philip F. Patman   Title: Chief Financial Officer and Treasurer