One Stop Systems holders report 5% ownership stake

ONE STOP SYSTEMS, INC. has a significant shareholder group consisting of Vladimir Galkin, Angelica Galkin and the Angelica Galkin Revocable Trust.

Rhea-AI Filing Summary

ONE STOP SYSTEMS, INC. has a significant shareholder group consisting of Vladimir Galkin, Angelica Galkin and the Angelica Galkin Revocable Trust. Vladimir and Angelica Galkin each report beneficial ownership of 1,240,000 shares of common stock, representing 5% of the class.

The Angelica Galkin Revocable Trust, dated April 21, 2018, holds 1,040,000 shares, representing 4.2% of the outstanding common stock. These percentages are based on 24,769,017 shares outstanding as of March 31, 2026, as reported by the company.

Key Figures

Shares beneficially owned per Galkin: 1,240,000 shares Ownership percentage per Galkin: 5 % Trust shares held: 1,040,000 shares +3 more

6 metrics

Shares beneficially owned per Galkin 1,240,000 shares Beneficial ownership reported for each of Vladimir and Angelica Galkin

Ownership percentage per Galkin 5 % Percent of ONE STOP SYSTEMS common stock for each of Vladimir and Angelica Galkin

Trust shares held 1,040,000 shares Common stock held by the Angelica Galkin Revocable Trust

Trust ownership percentage 4.2 % Percent of outstanding common stock held by the revocable trust

Jointly owned shares 200,000 shares Common stock jointly owned by Vladimir and Angelica Galkin

Shares outstanding 24,769,017 shares ONE STOP SYSTEMS common stock outstanding as of March 31, 2026

Key Terms

beneficially owned, shared voting power, shared dispositive power, Section 13(d)(3), +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: Reference is made as to each of the Reporting Persons"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 1,240,000.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 1,240,000.00"

Section 13(d)(3) regulatory

"member of a "group" within the meaning of Section 13(d)(3) of the Exchange Act"

beneficial owner financial

"shall not be construed as an admission by any Reporting Person that such Reporting Person is a beneficial owner"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ONE STOP SYSTEMS (OSS) shares do Vladimir and Angelica Galkin beneficially own?

Vladimir and Angelica Galkin each report beneficial ownership of 1,240,000 shares of ONE STOP SYSTEMS common stock. This stake represents 5% of the company’s outstanding common stock, based on 24,769,017 shares outstanding as of March 31, 2026.

What percentage of ONE STOP SYSTEMS (OSS) is held by the Angelica Galkin Revocable Trust?

The Angelica Galkin Revocable Trust holds 1,040,000 shares of ONE STOP SYSTEMS common stock. This position represents 4.2% of the outstanding shares, calculated using 24,769,017 shares outstanding as of March 31, 2026.

What is the total share base used to calculate the Galkins’ ownership in OSS?

The reported ownership percentages use a total of 24,769,017 shares of ONE STOP SYSTEMS common stock outstanding as of March 31, 2026. This share count comes from the company’s reported outstanding shares for that date.

How are voting and dispositive powers over ONE STOP SYSTEMS (OSS) shares allocated for the Galkins?

Vladimir and Angelica Galkin each report 0 shares with sole voting or dispositive power and 1,240,000 shares with shared voting and shared dispositive power. The Angelica Galkin Revocable Trust has shared voting and dispositive power over 1,040,000 shares.

What portion of the Galkins’ OSS holdings is jointly owned by Vladimir and Angelica?

Their reported holdings include 200,000 shares of ONE STOP SYSTEMS common stock that are jointly owned by Vladimir and Angelica Galkin. The remaining 1,040,000 shares are held through the Angelica Galkin Revocable Trust with shared voting and dispositive power.

Where is the Angelica Galkin Revocable Trust organized and who controls it?

The Angelica Galkin Revocable Trust is organized in Florida. Angelica Galkin is the sole trustee and sole beneficiary, and the trust has shared voting and dispositive power over 1,040,000 shares of ONE STOP SYSTEMS common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 07/24/2026 - 08:56 PM Accepted by SEC EDGAR 07/24/2026 - 08:55 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

ONE STOP SYSTEMS, INC.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

68247W109

(CUSIP Number)

07/24/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 68247W109

1

Names of Reporting Persons

Galkin Vladimir

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,240,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,240,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,240,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: (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.

SCHEDULE 13G

CUSIP Number(s): 68247W109

1

Names of Reporting Persons

Galkin Angelica

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,240,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,240,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,240,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: (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.

SCHEDULE 13G

CUSIP Number(s): 68247W109

1

Names of Reporting Persons

Angelica Galkin Revocable Trust, dated April 21, 2018

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

FLORIDA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,040,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,040,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,040,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.2 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: (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.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ONE STOP SYSTEMS, INC.
(b)	Address of issuer's principal executive offices: 2235 ENTERPRISE ST STE 110, ESCONDIDO, CALIFORNIA 92029
Item 2.
(a)	Name of person filing: Vladimir Galkin Angelica Galkin Angelica Galkin Revocable Trust
(b)	Address or principal business office or, if none, residence: 10900 NW 97th Street, #102 Miami, FL 33178
(c)	Citizenship: Vladimir Galkin and Angelica Galkin are citizens of United States. Angelica Galkin Revocable Trust is organized in the state of Florida.
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP Number(s): 68247W109
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 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.
(b)	Percent of class: See information for reporting persons.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See information for reporting persons.
	(ii) Shared power to vote or to direct the vote: See information for reporting persons.
	(iii) Sole power to dispose or to direct the disposition of: See information for reporting persons.
	(iv) Shared power to dispose or to direct the disposition of: See information for reporting persons.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. See Item 4 of this Schedule 13G and the Joint Filing Agreement attached hereto as Exhibit A.
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

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.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Galkin Vladimir

Signature:	/s/ Vladimir Galkin
Name/Title:	Individual
Date:	07/24/2026

Galkin Angelica

Signature:	/s/ Angelica Galkin
Name/Title:	Individual
Date:	07/24/2026

Angelica Galkin Revocable Trust, dated April 21, 2018

Signature:	/s/ Angelica Galkin
Name/Title:	Trustee
Date:	07/24/2026