X0202 SCHEDULE 13G 0002020621 XXXXXXXX LIVE Common Stock, par value $0.0001 per share 07/24/2026 0001394056 ONE STOP SYSTEMS, INC. 68247W109 2235 ENTERPRISE ST STE 110 ESCONDIDO CA 92029 Rule 13d-1(c) Galkin Vladimir b X1 0 1240000 0 1240000 1240000 5 IN (1) Includes 200,000 shares of Common Stock jointly owned by Vladimir Galkin and Angelica Galkin, husband and wife (the Galkins). (2) Vladimir Galkin also has shared voting power and dispositive power over 1,040,000 shares of Common Stock, which are held by the Angelica Revocable Trust, dated April 21, 2018 (Galkin Revocable Trust). Ms. Galkin is the sole trustee and beneficiary of the Galkin Revocable Trust. (3) Based on 24,769,017 shares of the Issuer's Common Stock outstanding as of March 31, 2026, as reported on the Issuer's Annual Report on Form 10-Q filed with the Securities and Exchange Commission (the SEC) on May 6, 2026. Galkin Angelica b X1 0 1240000 0 1240000 1240000 5 IN (1) Includes 200,000 shares of Common Stock jointly owned by the Galkins. (2) Angelica Galkin also has shared voting power and dispositive power over 1,040,000 shares of Common Stock, which are held by the Galkin Revocable Trust. Ms. Galkin is the sole trustee and beneficiary of the Galkin Revocable Trust. (3) Based on 24,769,017 shares of the Issuer's Common Stock outstanding as of March 31, 2026, as reported on the Issuer's Annual Report on Form 10-Q filed with the Securities and Exchange Commission (the SEC) on May 6, 2026. Angelica Galkin Revocable Trust, dated April 21, 2018 b FL 0 1040000 0 1040000 1040000 4.2 OO (1) Angelica Galkin is the sole trustee and beneficiary of the Galkin Revocable Trust. (2) Based on 24,769,017 shares of the Issuer's Common Stock outstanding as of March 31, 2026, as reported on the Issuer's Annual Report on Form 10-Q filed with the Securities and Exchange Commission (the SEC) on May 6, 2026. ONE STOP SYSTEMS, INC. 2235 ENTERPRISE ST STE 110, ESCONDIDO, CALIFORNIA 92029 Vladimir Galkin Angelica Galkin Angelica Galkin Revocable Trust 10900 NW 97th Street, #102 Miami, FL 33178 Vladimir Galkin and Angelica Galkin are citizens of United States. Angelica Galkin Revocable Trust is organized in the state of Florida. Y Reference is made as to each of the Reporting Persons hereunder to Rows 5-9 and 11 of each of the cover pages of this Schedule 13G and associated footnotes, which are incorporated by reference herein. Each of the Reporting Persons hereunder may be deemed a member of a "group" within the meaning of Section 13(d)(3) of the Exchange Act, or Rule 13d-5 promulgated under the Exchange Act with one or more of the other Reporting Persons hereunder. Although the Reporting Persons are reporting such securities as if they were members of a "group," the filing of this Schedule 13G shall not be construed as an admission by any Reporting Person that such Reporting Person is a beneficial owner of any securities other than those directly held by such Reporting Person. See information for reporting persons. See information for reporting persons. See information for reporting persons. See information for reporting persons. See information for reporting persons. Y Y Y See Item 4 of this Schedule 13G and the Joint Filing Agreement attached hereto as Exhibit A. Y By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Galkin Vladimir /s/ Vladimir Galkin 07/24/2026 Galkin Angelica /s/ Angelica Galkin 07/24/2026 Angelica Galkin Revocable Trust, dated April 21, 2018 /s/ Angelica Galkin 07/24/2026