# EDGAR Filing Document

**Accession Number:** 0001031235
**File Stem:** 0001628873-25-000012
**Filing Date:** 2025-12
**Character Count:** 35814
**Document Hash:** 1a8ffd7175803a6ec96bcadcc1d5becd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628873-25-000012.hdr.sgml**: 20251205

**ACCESSION NUMBER**: 0001628873-25-000012

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20251205

**DATE AS OF CHANGE**: 20251205

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Global Self Storage, Inc.
- **CENTRAL INDEX KEY:** 0001031235
- **STANDARD INDUSTRIAL CLASSIFICATION:** REAL ESTATE INVESTMENT TRUSTS [6798]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 133926714
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-80321
- **FILM NUMBER:** 251553287

**BUSINESS ADDRESS:**
- **STREET 1:** 3814 ROUTE 44
- **CITY:** MILLBROOK
- **STATE:** NY
- **ZIP:** 12545
- **BUSINESS PHONE:** 2127850900

**MAIL ADDRESS:**
- **STREET 1:** 3814 ROUTE 44
- **CITY:** MILLBROOK
- **STATE:** NY
- **ZIP:** 12545

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Self Storage Group, Inc.
- **DATE OF NAME CHANGE:** 20131118

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GLOBAL INCOME FUND, INC.
- **DATE OF NAME CHANGE:** 20060215

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GLOBAL INCOME FUND INC
- **DATE OF NAME CHANGE:** 19990830
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WINMILL MARK CAMPBELL
- **CENTRAL INDEX KEY:** 0001019264

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** 3814 ROUTE 44
- **CITY:** MILLBROOK
- **STATE:** NY
- **ZIP:** 12545

## Ex-1

#### EXHIBIT A

#### Information Required by Instruction C to Schedule 13D
<u>Item 2 (a)-(c)</u>

In addition to Mark C. Winmill and Thomas B. Winmill, the trustees of the Winmill Family Trust (the "Trust") are William Winmill and Woodworth Winmill, sons of Thomas B. Winmill.

In addition to Mark C. Winmill and Thomas B. Winmill, the directors of Winmill & Co. Incorporated ("Winco") are William Winmill and Woodworth Winmill, sons of Thomas B. Winmill, John Arbolino, Mark Hansen, and North Sturtevant.

In addition to Thomas B. Winmill, the directors of Midas Securities Group, Inc. ("MSG" or the "Broker-Dealer") are Thomas O'Malley.

In addition to Mark C. Winmill, the directors of Tuxis Corporation ("TUXS") are Timothy E. Taft and Susan E. Parker.

The Trust does not have any executive officers.

The executive officers of Winco and MSG, in addition to Thomas B. Winmill and Mark C. Winmill, are Thomas O'Malley, Donald Klimoski II, Russell Kamerman, Heidi Keating, and Louis Soulios.

The executive officers of TUXS, in addition to Mark C. Winmill are Thomas O'Malley and Donald Klimoski II.

#### THE TRUST, WINCO, MSG AND TUXS (OTHER THAN MARK C. WINMILL AND THOMAS B. WINMILL)

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Name** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Present principal occupation or employment and the name, principal business and address of any corporation or other organization in which such employment is conducted**<br>|
| William Winmill | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trustee of the Trust. Director of Bexil Corporation ("BXLC") and Winco since 2021 and Investor at Chester Holdings, a family investment office in Greenwich, CT, 2021 – present. Previously, he served as Vice President and/or in such other capacities of BXLC, Winco, its affiliates, and the Issuer, from 2014 – 2019. He graduated from Columbia University Graduate School of Business in 2021. William is the son of Thomas B. Winmill. |
| Woodworth Winmill | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trustee of the Trust. Associate at Milberg, PLLC from May 2025 - present, director of Winco 2021 - present, and director of BXLC 2023 - present. Previously, he served in various employment or other capacities of the BXLC, Winco, its affiliates, and the Issuer, from 2016 - 2017. He graduated from Columbia Law School in 2021. Woodworth is the son of Thomas B. Winmill. |
| John Arbolino | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Director of Winco. Mr. Arbolino has also served as Vice President of Corporate Development at Solomon Page Group, LLC, 2014 – 2017 and is principal at Boothroyd & Co, 2017 – present. |
| Mark Hansen | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Director of Winco. Mr. Hansen also serves as Diocesan Missioner for Latino Ministry and Ecumenical Officer, 2022 - present. |
| North Sturtevant | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Director of Winco. Mr. Sturtevant also serves as Principal/CEO of JSA Inc. Architects. |

---

------

---

| | |
|:---|:---|
| Timothy E. Taft | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Director of TUXS. Mr. Taft is President and Chief Executive Officer of Taft Energy, LLC, a manager of numerous gas and oil wells located throughout the Gulf Coast of the United States including Texas and Louisiana. |
| Susan E. Parker | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Director of TUXS. Ms. Parker previously worked in cargo marketing and sales for KLM Royal Dutch Airlines and Deutsche Post DHL Group. |
| Thomas O'Malley | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Chief Accounting Officer, Chief Financial Officer, Vice President, and Treasurer of the Issuer, the Funds, the Advisers, the Broker-Dealer, BXLC, Winco and TUXS. |
| Donald Klimoski II | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Senior Vice President – Operations, Chief Compliance Officer, Secretary, and General Counsel of the Issuer. Assistant Secretary, Assistant General Counsel, and Assistant Chief Compliance Officer of the Funds, the Advisers, the Broker-Dealer, and BXLC. Chief Compliance Officer, Secretary, and General Counsel of TUXS. He is Chief Compliance Officer, Secretary, and Co-General Counsel of Winco. |
| Heidi Keating | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Vice President of the Funds, the Advisers, the Broker Dealer, BXLC, Winco, the Issuer, and TUXS. |
| Russell L. Kamerman | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Assistant Chief Compliance Officer, Assistant General Counsel, and Assistant Secretary of the Issuer and TUXS. Chief Compliance Officer, General Counsel, and Secretary of the Funds, the Advisers, the Broker-Dealer, BXLC, and BAL. He is Co-General Counsel, Assistant Chief Compliance Officer, and Assistant Secretary of Winco. |
| Louis Soulios | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Vice President, Finance, of the Issuer, Funds, the Advisers, the Broker-Dealer, BXLC, TUXS, and Winco. He is a certified public accountant. |

---

 <u>Item 2 (d)-(f)</u>

To the best of the Reporting Persons' knowledge and information, during the past five years, none of the individuals named above have been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) and none of the individuals named above were a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

To the best of the Reporting Persons' knowledge and information, each individual named above is a citizen of the United States.

<u>Item 5</u>

The following table presents certain information regarding the direct and/or indirect beneficial ownership of the Issuer's shares as of December 4, 2025 by each foregoing officers and directors, other than Mark C. Winmill and Thomas B. Winmill; provided, however: MSG, Winco, the Trust, disclaim beneficial ownership of the Shares held by Thomas B. Winmill; MSG, Winco, the Trust, disclaim beneficial ownership of the Shares held by Mark C. Winmill; the Trust, Thomas B. Winmill, MSG, Winco, the Trust, disclaim beneficial ownership of the Shares held by TUXS.

---

| | |
|:---|:---|
| Name of Officer or Director | Number of Shares |
| William Winmill | 55 |
| Woodworth Winmill | 0 |
| John Arbolino | 0 |
| Mark Hansen | 0 |
| North Sturtevant | 0 |
| Timothy E. Taft | 0 |
| Susan E. Parker | 0 |
| Thomas O'Malley | 80640 |
| Donald Klimoski II | 86500 |
| Russell Kamerman | 5425 |
| Louis Soulios | 3000 |
| Heidi Keating | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1218 |

---

## Ex-2

#### EXHIBIT B

#### AGREEMENT

This AGREEMENT is made and entered into December 5, 2025, among Mark C. Winmill, Thomas B. Winmill, Winmill & Co. Incorporated, Midas Securities Group, Inc., the Winmill Family Trust, and Tuxis Corporation.

WHEREAS, pursuant to paragraph (k) of Rule 13d-1 promulgated under Subsection 13(d)(1) of the Securities Exchange Act of 1934, as amended (the "1934 Act"), the parties hereto have decided to satisfy their filing obligations under the 1934 Act by a single joint filing:

NOW, THEREFORE, the undersigned hereby agree as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The Schedule 13D and all amendments thereto with respect to Global Self Storage, Inc. to which this is attached as Exhibit A are filed on behalf of Mark C. Winmill, Thomas B. Winmill, Winmill & Co. Incorporated, Midas Securities Group, Inc., the Winmill Family Trust, and Tuxis Corporation.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Each of Mark C. Winmill, Thomas B. Winmill, Winmill & Co. Incorporated, Midas Securities Group, Inc., the Winmill Family Trust, and Tuxis Corporation is responsible for the completeness and accuracy of the information concerning such person contained therein; provided that each person is not responsible for the completeness or accuracy of the information concerning any other person making such filing, unless such person knows or has reason to believe that such information is inaccurate.

IN WITNESS WHEREOF, the undersigned hereunto set their hands as of the date first above written.

SIGNATURES

---

| |
|:---|
| <br> **Winmill & Co. Incorporated**<br> By: /s/ Donald Klimoski II |
| Name: Donald Klimoski II |
| Title: Co-General Counsel |

---

&nbsp;&nbsp;&nbsp;&nbsp; <br>

---

| |
|:---|
| **Midas Securities Group, Inc.**<br> By: /s/ Russell Kamerman |
| Name: Russell Kamerman |
| Title: General Counsel |

---

---

| |
|:---|
| **Winmill Family Trust**<br> By: /s/ Thomas B. Winmill |
| Name: Thomas B. Winmill |
| Title: Trustee |

---

---

| |
|:---|
| By: /s/ Mark C. Winmill |
| Name: Mark C. Winmill |
| Title: Trustee |

---

---

| |
|:---|
| **Tuxis Corporation**<br>By: /s/ Donald Klimoski II |
| Name: Donald Klimoski II |
| Title: General Counsel |

---

---

| |
|:---|
| **Individuals**<br>By: /s/ Mark C. Winmill |
| Name: Mark C. Winmill |

---

---

| |
|:---|
| By: /s/ Thomas B. Winmill |
| Name: Thomas B. Winmill |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 3)**

**GLOBAL SELF STORAGE, INC.**

*(Name of Issuer)*

**Common Stock, $0.01 par value per share**

*(Title of Class of Securities)*

**37955N106**

*(CUSIP Number)*

**Donald Klimoski II, Esq.**<br>3814 Route 44<br>Millbrook NY 12545<br>2127850900

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**12/03/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **37955N106** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Mark Campbell Winmill** | Name of reporting person<br>**Mark Campbell Winmill** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**339238.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**608497.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**339238.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**608497.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**947735.00** | Aggregate amount beneficially owned by each reporting person<br>**947735.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.4%** | Percent of class represented by amount in Row (11)<br>**8.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Percent of class in Row 13 based on 11,337,720 shares of common stock, $0.01 par value per share outstanding as of November 6, 2025, as reported by Global Self Storage, Inc. (the "Issuer") on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025

| **CUSIP No.** | **37955N106** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Thomas Bassett Winmill** | Name of reporting person<br>**Thomas Bassett Winmill** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**1100.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**586500.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**1100.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**586500.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**587600.00** | Aggregate amount beneficially owned by each reporting person<br>**587600.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5.2%** | Percent of class represented by amount in Row (11)<br>**5.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Percent of class in Row 13 based on 11,337,720 shares of common stock, $0.01 par value per share outstanding as of November 6, 2025, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025.

| **CUSIP No.** | **37955N106** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Winmill Family Trust** | Name of reporting person<br>**Winmill Family Trust** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**586500.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**586500.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**586500.00** | Aggregate amount beneficially owned by each reporting person<br>**586500.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5.2%** | Percent of class represented by amount in Row (11)<br>**5.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Percent of class in Row 13 based on 11,337,720 shares of common stock, $0.01 par value per share outstanding as of November 6, 2025, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025.

| **CUSIP No.** | **37955N106** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Winmill & Co. Incorporated** | Name of reporting person<br>**Winmill & Co. Incorporated** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**147641.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**438859.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**147641.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**438859.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**586500.00** | Aggregate amount beneficially owned by each reporting person<br>**586500.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5.2%** | Percent of class represented by amount in Row (11)<br>**5.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Percent of class in Row 13 based on 11,337,720 shares of common stock, $0.01 par value per share outstanding as of November 6, 2025, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025.

| **CUSIP No.** | **37955N106** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Midas Securities Group, Inc.** | Name of reporting person<br>**Midas Securities Group, Inc.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**135101.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**303758.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**135101.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**303758.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**438859.00** | Aggregate amount beneficially owned by each reporting person<br>**438859.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**3.9%** | Percent of class represented by amount in Row (11)<br>**3.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**BD** | Type of Reporting Person (See Instructions)<br>**BD** | |

---

**Comment for Reporting Person:** Percent of class in Row 13 based on 11,337,720 shares of common stock, $0.01 par value per share outstanding as of November 6, 2025, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025.

| **CUSIP No.** | **37955N106** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**TUXIS CORP** | Name of reporting person<br>**TUXIS CORP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**SC** | Source of funds (See Instructions)<br>**SC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**303758.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**303758.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**303758.00** | Aggregate amount beneficially owned by each reporting person<br>**303758.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**2.7%** | Percent of class represented by amount in Row (11)<br>**2.7%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Percent of class in Row 13 based on 11,337,720 shares of common stock, $0.01 par value per share outstanding as of November 6, 2025, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.01 par value per share

**(b) Name of Issuer:**
GLOBAL SELF STORAGE, INC.

**(c) Address of Issuer's Principal Executive Offices:**
3814 Route 44, Millbrook, NY, 12545

This Amendment Number 3 ("Amendment 3") to the Schedule 13D relates to the shares of common stock, $0.01 par value per share ("Shares") of Global Self Storage, Inc., a Maryland corporation (the "Issuer"). The principal executive offices of the Issuer are located at 3814 Route 44, Millbrook, NY 12545. The Schedule 13D was initially filed with the Securities and Exchange Commission ("SEC") on March 17, 2017, was amended by Amendment Number 1 filed with the SEC on June 1, 2018, and was amended by Amendment Number 2 filed with the SEC on May 21, 2025 (together with the initial Schedule 13D, collectively, ("Schedule 13D").  Except to the extent amended and supplemented by this Amendment 3, the Schedule 13D is not modified.

**Item 4. Purpose of Transaction**

The Reporting Persons acquired the Shares for investment purposes.   
 
Notwithstanding any of the foregoing, the Reporting Persons may at any time modify, change, abandon, or replace, some or all of the foregoing purposes and plans and discussions relating thereto or discontinue or re-continue such modifications, changes, abandonments, or replacements at any time.

**Item 5. Interest in Securities of the Issuer**

**(a)**
As of November 6, 2025 there were 11,337,720 Shares outstanding, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the SEC on November 7, 2025.  Based on the Shares outstanding as of November 6, 2025: 

Mark C. Winmill may be deemed to be the beneficial owner of 947,735.2890 Shares which constitute approximately 8.4% of the outstanding Shares, as follows: (i) 339,238.2890 Shares in which he possesses sole voting power and dispositive power and (ii) 608,497 Shares in which he shares voting power and dispositive power with one or more Reporting Persons. Mr. Mark Winmill disclaims beneficial ownership of the Shares owned, or which may be deemed to be owned, by TUXS, the Trust, Winco, MSG, and the Michael M. George Trust.

Thomas B. Winmill may be deemed to be the beneficial owner of 587,600 Shares which constitute approximately 5.2% of the outstanding Shares, as follows: (i) 1,100 Shares in which he possesses sole voting power and dispositive power and (ii) 586,500 Shares in which he shares voting power and dispositive power with one or more Reporting Persons. Mr. Thomas Winmill disclaims beneficial ownership of the Shares owned, or which may be deemed to be owned, by TUXS, the Trust, Winco, and MSG.

Winco may be deemed to be the beneficial owner of 586,500 Shares which constitute approximately 5.2% of the outstanding Shares, as follows: (i) 147,641 Shares in which it possesses sole voting power and dispositive power and (ii) 438,859 Shares in which it shares voting power and dispositive power with one or more Reporting Persons. Winco disclaims beneficial ownership of the Shares held by TUXS.

The Trust may be deemed to be the beneficial owner of 586,500 Shares which constitute approximately 5.2% of the outstanding Shares, over which such Shares it may be deemed to share voting power and dispositive power with one or more Reporting Persons. The Trust disclaims beneficial ownership of all the Shares.

TUXS may be deemed to be the direct beneficial owner of 303,758 Shares which constitute approximately 2.7% of the outstanding Shares. 

Information required by Instruction C of Schedule 13D with respect to other directors and executive officers of and trustees is attached hereto as Exhibit A, Item 5 and is incorporated herein by reference.

**(b)**
Mark C. Winmill, Thomas B. Winmill, TUXS, Winco, MSG, and the Michael M. George Trust have the power to vote and to dispose of their respective directly owned Shares.

**(c)**
During the past 60 days, the following transactions were effected in the Shares by the Reporting Persons:

Reporting Person: Mark C. Winmill
Date: 12/5/2025
Transaction: Buy
Number of Shares: 3,600 
Price per Share: 5.09
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Mark C. Winmill
Date: 12/5/2025
Transaction: Buy
Number of Shares: 800 
Price per Share: $5.05
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Mark C. Winmill
Date: 12/4/2025
Transaction: Buy
Number of Shares: 6,000 
Price per Share: $5.14149
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Mark C. Winmill
Date: 12/3/2025
Transaction: Buy
Number of Shares: 6,000 
Price per Share: $5.1284
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 12/1/2025
Transaction: Buy
Number of Shares: 3,062 	
Price per Share: $5.1774
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date:  11/28/2025
Transaction: Buy
Number of Shares 3,342 	
Price per Share: $5.1552
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date:  11/26/2025
Transaction: Buy
Number of Shares: 4,873 	
Price per Share: $5.1662 
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/25/2025
Transaction: Buy
Number of Shares: 4,547 	
Price per Share: $5.1829 
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/24/2025
Transaction: Buy
Number of Shares: 4,064 	
Price per Share: $5.1437
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/21/2025
Transaction: Buy
Number of Shares: 6,226  	
Price per Share: $5.0872
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/20/2025
Transaction: Buy
Number of Shares: 5,870 	
Price per Share: $5.0838
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/19/2025
Transaction: Buy
Number of Shares: 6,226 	
Price per Share: $5.1349
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/18/2025
Transaction: Buy
Number of Shares: 5,618 	
Price per Share: $5.1578
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/17/2025
Transaction: Buy
Number of Shares: 6,226 	
Price per Share: $5.1246
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/14/2025
Transaction: Buy
Number of Shares: 7,035  	
Price per Share: $5.0943
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/13/2025
Transaction: Buy
Number of Shares: 6,694 	
Price per Share: $5.0262
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/12/2025
Transaction: Buy
Number of Shares: 6,055 	
Price per Share: $5.027
Where and How Transaction Effected: Open Market Purchase

Reporting Person: Winmill & Co. Incorporated
Date: 11/11/2025
Transaction: Buy
Number of Shares: 2,069 	
Price per Share: $4.9698
Where and How Transaction Effected: Open Market Purchase

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

On November 23, 2016, the Issuer entered into a purchase agreement (the "Purchase Agreement") with TUXS, an Issuer affiliate, to acquire all of the membership interests of each of Tuxis Self Storage I LLC, Tuxis Self Storage II LLC, and Tuxis Real Estate II LLC, each a wholly owned subsidiary of TUXS (collectively, the "TUXS Subsidiaries"), for the aggregate purchase price of $7,800,000, comprised of $5,925,000 payable in cash, $975,000 in Shares, and, contingent upon the satisfaction of certain conditions described in the Purchase Agreement, an additional $900,000 cash payment (the "Acquisition").

On December 30, 2016, the Issuer completed the Acquisition for $5,925,000 in cash and 202,703 unregistered and restricted Shares and entered into a registration rights agreement which permits TUXS to request the registration of such Shares.

Certain officers and/or directors of the Issuer are officers, directors, and/or trustees of the Reporting Persons.
   
The information provided under Items 2 and 3 of this Schedule 13D are incorporated herein by reference.

### 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.

**Reporting Person:** Mark Campbell Winmill

**Signature:** /s/ Mark C. Winmill

**Name/Title:** Mark Campbell Winmill

**Date:** 12/05/2025

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.

**Reporting Person:** Thomas Bassett Winmill

**Signature:** /s/ Thomas B. Winmill

**Name/Title:** Thomas Bassett Winmill

**Date:** 12/05/2025

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.

**Reporting Person:** Winmill Family Trust

**Signature:** /s/ Thomas B. Winmill

**Name/Title:** Thomas B. Winmill/Trustee

**Date:** 12/05/2025

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.

**Reporting Person:** Winmill & Co. Incorporated

**Signature:** /s/ Donald Klimoski II

**Name/Title:** Donald Klimoski II/Co-General Counsel

**Date:** 12/05/2025

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.

**Reporting Person:** Midas Securities Group, Inc.

**Signature:** /s/ Russell Kamerman

**Name/Title:** Russell Kamerman/General Counsel

**Date:** 12/05/2025

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.

**Reporting Person:** TUXIS CORP

**Signature:** /s/ Donald Klimoski II

**Name/Title:** Donald Klimoski II/General Counsel

**Date:** 12/05/2025