X0202 SCHEDULE 13D/A 0002057625 XXXXXXXX LIVE 2 Ordinary Shares, par value $0.15 per share 07/16/2026 false 0001856084 G2124G203 Ridgetech Inc.

5/F, Bldg 6, No. 100, 18th Street Baiyang Sub-dist., Qiantang Dist Hangzhou F4 310008

Lingtao Kong 86-571-88219579 5/F, Bldg 6, No. 100, 18th Street Baiyang Sub-dist., Qiantang Dist Zhejiang Province F4 310008 0002057625 N LINGTAO KONG OO N K3 114834.00 0.00 114834.00 0.00 114834.00 N 3.2 IN (1) Consists of (i) ordinary shares, par value $0.15 per share (the "Ordinary Shares") held of record by Lingtao Kong, and (ii) Series A preferred shares, par value $0.001 (the "Series A Preferred Shares"), held of record by Lingtao Kong. (2) Each Series A Preferred Share is convertible at the option of the holder at any time into one Ordinary Share, subject to the terms of the Statement of Rights applicable to such Series A Preferred Shares. (3) The percentage calculation is based on an aggregate of 3,629,540 ordinary shares outstanding as of the date of this report, based on information provided by the Issuer. Ordinary Shares, par value $0.15 per share Ridgetech Inc. 5/F, Bldg 6, No. 100, 18th Street Baiyang Sub-dist., Qiantang Dist Hangzhou F4 310008 (a)-(b) of Item 5 of the Schedule 13D is hereby amended as set forth below. (a) - (b) Calculations of the percentage of Ordinary Shares beneficially owned assume that there were 3,629,540 Ordinary Shares outstanding as of July 16, 2026, based on information provided by the Issuer. In accordance with Rule 13d-3(d)(1), the 100,000 Ordinary Shares issuable upon conversion of the 100,000 Series A Preferred Shares beneficially owned by the Reporting Person are deemed outstanding for purposes of calculating the Reporting Person's percentage of beneficial ownership. Following the Issuer's 1-for-150 reverse share split effective April 7, 2026, the Reporting Person beneficially owned 14,834 Ordinary Shares. On July 15, 2026, the Reporting Person acquired 100,000 Series A Preferred Shares, each of which is convertible at the option of the holder at any time into one Ordinary Share, subject to the terms of the Statement of Rights applicable to such Series A Preferred Shares. Except for the acquisition of the Series A Preferred Shares, the Reporting Person has not disposed of or acquired any Ordinary Shares since the filing of Amendment No. 1 to Schedule 13D on December 1, 2025. The aggregate number and percentage of the ordinary shares beneficially owned by the Reporting Person, the number of shares as to which there is sole power to vote or to direct the vote, shares power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition are set forth on rows 7 through 11 and row 13 of, and the footnotes included on, the cover pages of this Amendment No. 2, all of which are incorporated herein by reference. LINGTAO KONG /s/ Lingtao Kong 07/20/2026