One Stop Systems (OSS) investors Galkins disclose 6.1% beneficial stake in 13G/A

Rhea-AI Filing Summary

One Stop Systems, Inc. investors Vladimir and Angelica Galkin and the Angelica Galkin Revocable Trust report significant holdings of the company’s common stock. Vladimir and Angelica Galkin each report beneficial ownership of 1,500,000 shares of common stock, representing 6.1% of the outstanding class for each of them. These holdings include 200,000 shares jointly owned by the Galkins and 1,300,000 shares held by the Angelica Galkin Revocable Trust, over which they have shared voting and dispositive power. The Trust itself reports beneficial ownership of 1,300,000 shares, or 5.2% of the class. Percentages are based on 24,769,017 shares of One Stop Systems common stock outstanding as of March 31, 2026.

Key Figures

Shares beneficially owned by Vladimir Galkin: 1,500,000 shares Shares beneficially owned by Angelica Galkin: 1,500,000 shares Beneficial ownership percentage per Galkin: 6.1% +4 more

7 metrics

Shares beneficially owned by Vladimir Galkin 1,500,000 shares Beneficial ownership of One Stop Systems common stock

Shares beneficially owned by Angelica Galkin 1,500,000 shares Beneficial ownership of One Stop Systems common stock

Beneficial ownership percentage per Galkin 6.1% Percent of One Stop Systems common stock outstanding

Shares held by Galkin Revocable Trust 1,300,000 shares Held by Angelica Galkin Revocable Trust, dated April 21, 2018

Trust ownership percentage 5.2% Percent of One Stop Systems common stock outstanding

Jointly owned Galkin 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

beneficial owner, shared voting power, shared dispositive power, Schedule 13G, +1 more

5 terms

beneficial owner regulatory

"the filing 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.

shared voting power financial

"6 | Shared Voting Power 1,500,000.00 7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power 1,500,000.00"

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

"6 | Shared Voting Power 1,300,000.00 7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power 1,300,000.00"

Schedule 13G regulatory

"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"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

group regulatory

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

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Available on EDGAR 07/31/2026 - 05:16 PM Accepted by SEC EDGAR 07/31/2026 - 05:16 PM Learn about SEC filing dates

FAQ

How many OSS shares do Vladimir and Angelica Galkin report owning in this Schedule 13G/A?

Vladimir and Angelica Galkin each report beneficial ownership of 1,500,000 shares of One Stop Systems common stock. This represents 6.1% of the outstanding shares for each of them, including jointly owned shares and shares held through the Galkin Revocable Trust.

What percentage of One Stop Systems (OSS) is owned by the Angelica Galkin Revocable Trust?

The Angelica Galkin Revocable Trust reports beneficial ownership of 1,300,000 OSS shares, representing 5.2% of the common stock. Angelica Galkin is the sole trustee and beneficiary, with shared voting and dispositive power over these shares.

What is the total number of OSS shares outstanding used to calculate the Galkins’ ownership?

Ownership percentages are calculated based on 24,769,017 shares of One Stop Systems common stock outstanding as of March 31, 2026. This share count comes from the company’s Form 10-Q filed on May 6, 2026.

How many OSS shares do the Galkins jointly own directly?

The filing states that the Galkins jointly own 200,000 shares of One Stop Systems common stock. These jointly held shares are included within the 1,500,000 shares reported as beneficially owned by each of Vladimir and Angelica Galkin.

Do the OSS reporting persons in this Schedule 13G/A form a group under Section 13(d)?

The reporting persons state they may be deemed a “group” under Section 13(d)(3) and Rule 13d-5. However, they clarify the filing should not be construed as an admission of beneficial ownership beyond the securities directly held by each reporting person.

Who controls voting and dispositive power over the OSS shares held by the Galkin Revocable Trust?

The filing explains that Angelica Galkin is the sole trustee and beneficiary of the Angelica Galkin Revocable Trust. She has shared voting and dispositive power over the Trust’s 1,300,000 OSS shares along with the other reporting persons as described.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

ONE STOP SYSTEMS, INC.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

68247W109

(CUSIP Number)

07/31/2026

(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 1,500,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,500,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,500,000.00

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)

6.1 %

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 1,300,000 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 Quarterly 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 1,500,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,500,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,500,000.00

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)

6.1 %

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 1,300,000 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 Quarterly 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 1,300,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,300,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,300,000.00

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)

5.2 %

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 Quarterly 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 No.: 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)(J), so indicate under Item 3(j) 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:	07/31/2026

Galkin Angelica

Signature:	/s/ Angelica Galkin
Name/Title:	Individual
Date:	07/31/2026

Angelica Galkin Revocable Trust, dated April 21, 2018

Signature:	/s/ Angelica Galkin
Name/Title:	Trustee
Date:	07/31/2026