X0202 SCHEDULE 13D/A 0001051856 XXXXXXXX LIVE 2 Common Stock, $0.0001 par value 03/13/2026 false 0001855447 77867P104 Tigo Energy, Inc.

983 University Avenue, Suite B Los Gatos CA 95032

Alejandro Moreno (212) 247-6400 Access Industries, Inc. 40 West 57th St., 28th Floor New York NY 10019 Langhorne S. Perrow (212) 247-6400 Access Industries, Inc. 40 West 57th St., 28th Floor New York NY 10019 Nicholas P. Pellicani 44 20 7786 9000 Debevoise & Plimpton LLP 28 Tudor Street London X0 EC4Y 0AY 0001391297 N Access Industries Holdings LLC SC N DE 0 4057315 0 4057315 4057315 N 5.37 OO All percentages of ownership of the Common Stock by Reporting Persons presented in this Statement are based on an aggregate of 75,543,244 shares of Common Stock issued and outstanding immediately following the Issuer's registered offering of 5,000,000 shares of Common Stock, as reported in the Issuer's Prospectus Supplement filed pursuant to Rule 424(b)(5) with the Securities and Exchange Commission (the "SEC") on February 25, 2026. 0001508227 N Access Industries, LLC SC N DE 0 4057315 0 4057315 4057315 N 5.37 OO All percentages of ownership of the Common Stock by Reporting Persons presented in this Statement are based on an aggregate of 75,543,244 shares of Common Stock issued and outstanding immediately following the Issuer's registered offering of 5,000,000 shares of Common Stock, as reported in the Issuer's Prospectus Supplement filed pursuant to Rule 424(b)(5) with the SEC on February 25, 2026. 0001508226 N Access Industries Management, LLC SC N X1 0 4057315 0 4057315 4057315 N 5.37 OO All percentages of ownership of the Common Stock by Reporting Persons presented in this Statement are based on an aggregate of 75,543,244 shares of Common Stock issued and outstanding immediately following the Issuer's registered offering of 5,000,000 shares of Common Stock, as reported in the Issuer's Prospectus Supplement filed pursuant to Rule 424(b)(5) with the SEC on February 25, 2026. 0001051856 N Clal Industries Ltd. SC N L3 4057315 0 4057315 0 4057315 N 5.37 CO All percentages of ownership of the Common Stock by Reporting Persons presented in this Statement are based on an aggregate of 75,543,244 shares of Common Stock issued and outstanding immediately following the Issuer's registered offering of 5,000,000 shares of Common Stock, as reported in the Issuer's Prospectus Supplement filed pursuant to Rule 424(b)(5) with the SEC on February 25, 2026. 0001326628 N Len Blavatnik SC N X1 0 4057315 0 4057315 4057315 N 5.37 IN All percentages of ownership of the Common Stock by Reporting Persons presented in this Statement are based on an aggregate of 75,543,244 shares of Common Stock issued and outstanding immediately following the Issuer's registered offering of 5,000,000 shares of Common Stock, as reported in the Issuer's Prospectus Supplement filed pursuant to Rule 424(b)(5) with the SEC on February 25, 2026. Common Stock, $0.0001 par value Tigo Energy, Inc. 983 University Avenue, Suite B Los Gatos CA 95032 This Amendment No.2 to the Schedule 13D is being filed by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM"), Access Industries, LLC ("Access LLC"), Clal Industries Ltd. ("CI") and Len Blavatnik (collectively, the "Reporting Persons", and each, a "Reporting Person") to report the disposition of common stock, $0.0001 par value per share (the "Common Stock"), of Tigo Energy, Inc. (the "Issuer"). The Schedule 13D filed by the Reporting Persons with the Securities and Exchange Commission (the "SEC") on June 2, 2023 (the "Schedule"), as amended and supplemented by Amendment No. 1 to Schedule 13D, filed with the SEC on November 6, 2025, is hereby amended and supplemented by the Reporting Persons as set forth below in this Amendment No. 2. This amendment is filed by the Reporting Persons in accordance with Rule 13d-2 of the Securities Exchange Act of 1934, as amended, and refers only to information that has materially changed since the filing of the Schedule. The items identified below, or the particular paragraphs of such items which are identified below, are amended as set forth below. Unless otherwise indicated, all capitalized terms used and not defined herein have the respective meanings assigned to them in the Schedule. The disclosure in Items 5(a), (b) and (d) is hereby amended and restated as follows: (a) (b) The responses of each of the Reporting Persons with respect to Rows 11, 12, and 13 of the cover pages of this Schedule 13D that relate to the aggregate number and percentage of shares of Common Stock (including but not limited to footnotes to such information) are incorporated herein by reference. The responses of each of the Reporting Persons with respect to Rows 7, 8, 9, and 10 of the cover pages of this Schedule 13D that relate to the number of shares of Common Stock as to which each of the persons or entities referenced in Item 2 above has sole or shared power to vote or to direct the vote of and sole or shared power to dispose of or to direct the disposition of (including but not limited to footnotes to such information) are incorporated herein by reference. The disclosure in Item 5(c) is hereby supplemented by adding the following at the end thereof: (c) The transactions in the Issuer's securities effected by the Reporting Persons within 60 days prior to this filing are set forth on Annex A, filed as Exhibit 99.6 attached hereto and incorporated herein by reference. 4,057,315 shares of Common Stock are owned directly by CI and each of AIH, Access LLC, AIM and Mr. Blavatnik may be deemed to share voting and investment power over the shares of Common Stock owned by CI because (i) Len Blavatnik controls AIM, AIH, Access LLC and AI International GP Limited (the general partner of AI SMS, as defined below), (ii) Access LLC controls a majority of the outstanding voting interests in AIH, (iii) AIM controls Access LLC and AIH, (iv) AIH owns a majority of the equity of AI SMS L.P. ("AI SMS"), (v) AI SMS owns a majority of the equity of AI Diversified Holdings Ltd. ("Holdings Limited"), (vi) Holdings Limited owns AI Diversified Parent S.a r.l., which owns AI Diversified Holdings S.a r.l., which owns Access AI Ltd ("Access AI"), and (vii) Access AI wholly owns Clal Industries Ltd. ("CI"). Each of the Reporting Persons (other than CI), and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of the securities held directly by CI. 99.6 Annex A 99.7 Joint Filing Agreement, dated as of March 17, 2026. Access Industries Holdings LLC /s/ Alejandro Moreno 03/17/2026 Access Industries, LLC /s/ Alejandro Moreno 03/17/2026 Access Industries Management, LLC /s/ Alejandro Moreno 03/17/2026 Clal Industries Ltd. /s/ Nufar Malovani 03/17/2026 /s/ Alon Heller 03/17/2026 Len Blavatnik */s/ Alejandro Moreno 03/17/2026 * The above signed, by signing his name hereto, executes this Amendment No. 2 to Schedule 13D pursuant to the Limited Power of Attorney executed on behalf of Mr. Blavatnik and filed herewith.