SCHEDULE 13D/A: General Statement of Acquisition of Beneficial Ownership
Published on December 5, 2025
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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549 |
SCHEDULE 13D
Under the Securities Exchange Act of 1934
(Amendment No. 3)*
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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. 3814 Route 44, Millbrook, NY, 12545 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) |
If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.
The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the
Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other
provisions of the Act (however, see the Notes).
SCHEDULE 13D
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| CUSIP No. | 37955N106 |
| 1 |
Name of reporting person
Mark Campbell Winmill | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
AF, PF | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
| ||||||||
| 6 | Citizenship or place of organization
UNITED STATES
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
947,735.29 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
| ||||||||
| 13 | Percent of class represented by amount in Row (11)
8.4 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
IN |
Comment for Type of 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
SCHEDULE 13D
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| CUSIP No. | 37955N106 |
| 1 |
Name of reporting person
Thomas Bassett Winmill | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
AF, PF | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
| ||||||||
| 6 | Citizenship or place of organization
UNITED STATES
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
587,600.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
| ||||||||
| 13 | Percent of class represented by amount in Row (11)
5.2 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
IN |
Comment for Type of 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.
SCHEDULE 13D
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| CUSIP No. | 37955N106 |
| 1 |
Name of reporting person
Winmill Family Trust | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
AF | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
| ||||||||
| 6 | Citizenship or place of organization
UNITED STATES
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
586,500.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
| ||||||||
| 13 | Percent of class represented by amount in Row (11)
5.2 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
HC |
Comment for Type of 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.
SCHEDULE 13D
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| CUSIP No. | 37955N106 |
| 1 |
Name of reporting person
Winmill & Co. Incorporated | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
AF, WC | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
| ||||||||
| 6 | Citizenship or place of organization
UNITED STATES
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
586,500.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
| ||||||||
| 13 | Percent of class represented by amount in Row (11)
5.2 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
HC |
Comment for Type of 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.
SCHEDULE 13D
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| CUSIP No. | 37955N106 |
| 1 |
Name of reporting person
Midas Securities Group, Inc. | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
AF, WC | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
| ||||||||
| 6 | Citizenship or place of organization
UNITED STATES
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
438,859.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
| ||||||||
| 13 | Percent of class represented by amount in Row (11)
3.9 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
BD |
Comment for Type of 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.
SCHEDULE 13D
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| CUSIP No. | 37955N106 |
| 1 |
Name of reporting person
TUXIS CORP | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
SC, WC | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
| ||||||||
| 6 | Citizenship or place of organization
UNITED STATES
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
303,758.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
| ||||||||
| 13 | Percent of class represented by amount in Row (11)
2.7 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
CO |
Comment for Type of 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.
SCHEDULE 13D
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| 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,
NEW YORK
, 12545. | |
Item 1 Comment:
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 2. | Identity and Background | |
| (a) | (a) - (c) This Schedule 13D is being filed by the following (collectively, the "Reporting Persons"):
Mark C. Winmill
3814 Route 44, Millbrook, NY 12545
Thomas B. Winmill
PO Box 4, Walpole, NH 03608
Winmill Family Trust (the "Trust")
a New Hampshire trust
PO Box 1198, Walpole, NH 03608
Winmill & Co. Incorporated ("Winco")
a Delaware corporation
Holding company
2255 Buffalo Road, Rochester, NY 14624
Midas Securities Group, Inc. ("MSG")
a Delaware corporation
Broker/dealer
2255 Buffalo Road, Rochester, NY 14624
Tuxis Corporation ("TUXS")
a Maryland corporation
Holding company
2255 Buffalo Road, Rochester, NY 14624
Mark C. Winmill has been Chief Executive Officer, President and Chairman of the Board of the Issuer and its subsidiaries since 2012. He is also Chief Executive Officer, President, and a director of TUXS (a holding company) and its subsidiaries. He is Vice President of Foxby Corp. and Midas Series Trust. He is also Vice President of Midas Management Corporation (a registered investment adviser). He is Executive Vice President and a director of Winco. He is a principal of MSG, a registered broker-dealer (the "Broker-Dealer"). Messrs. Mark and Thomas Winmill are brothers.
Thomas B. Winmill has served as a director of the Issuer since 1997. He is also President, Chief Executive Officer, Chief Legal Officer, and a director or trustee of Bexil Investment Trust, Foxby Corp., and Midas Series Trust (collectively, the "Funds"). He is President, Chief Executive Officer, Chief Legal Officer, and a director of Bexil Advisers LLC and Midas Management Corporation (registered investment advisers and, collectively, the "Advisers"), the Broker-Dealer, and Bexil Corporation (a holding company) ("Bexil"). He is President, Chief Executive Officer, and Chief Legal Officer of Winco. He is a director of Bexil American Mortgage Inc. ("Bexil American"). Messrs. Mark and Thomas Winmill are brothers.
The Funds, the Advisers, Winco, the Broker-Dealer, Bexil, and Bexil American may be deemed to be affiliates of Mark C. Winmill and Thomas B. Winmill. Messrs. Mark and Thomas Winmill are trustees of the Trust.
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 2 and is incorporated herein by reference. | |
| (b) | See Item 2(a). | |
| (c) | See Item 2(a). | |
| (d) | None. | |
| (e) | None. | |
| (f) | Mark C. Winmill and Thomas B. Winmill are citizens of the United States of America. | |
| Item 3. | Source and Amount of Funds or Other Consideration | |
Mr. Mark C. Winmill used personal funds to acquire 144,876 directly owned Shares. His Shares also include 182,363 restricted Shares that are subject to restrictions on transfers and forfeiture provisions and were pursuant to restricted stock awards. The forfeiture and transfer restrictions lapse over a four-year period beginning on the date of grant. Mr. Mark Winmill is Chairman of the Board, President, and Chief Executive Officer of TUXS and may be deemed to have indirect beneficial ownership of 303,758 Shares directly owned by TUXS. Mr. Mark Winmill is a trustee of the Winmill Family Trust, which owns all of the voting stock of Winco, and may be deemed to have indirect beneficial ownership of 147,641 Shares directly owned by Winco. Additionally, MSG, a wholly owned subsidiary of Winco, directly owns 135,101 Shares and approximately 19% of TUXS' outstanding shares of common stock and may be deemed to have indirect beneficial ownership of the Shares directly owned by TUXS. Mr. Mark Winmill also is a trustee of the Michael M. George Trust and may be deemed to have indirect beneficial ownership of 21,997 Shares directly owned by the Michael M. George Trust. 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.
Mr. Thomas B. Winmill used personal funds to acquire 1,100 directly owned Shares. Mr. Thomas Winmill is a trustee of the Trust and may be deemed to have indirect beneficial ownership of the 586,500 Shares directly and indirectly owned by Winco as a result of his status as a controlling person of the Trust. 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 has direct beneficial ownership of 147,641 Shares and may be deemed to have indirect beneficial ownership of 303,758 Shares held by TUXS. MSG directly owns 135,101 Shares and approximately 19% of TUXS' outstanding shares of common stock and may be deemed to have indirect beneficial ownership of the Shares directly owned by TUXS. Winco disclaims beneficial ownership of the 303,758 Shares held by TUXS. Winco used working capital to acquire Shares.
The Trust owns all of the voting stock of Winco.
TUXS directly owns 303,758 Shares. TUXS used working capital to acquire Shares. | ||
| 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 | |
| (d) | Mark C. Winmill, Thomas B. Winmill, TUXS, Winco, MSG, and the Michael M. George Trust have the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, their respective directly owned Shares. | |
| (e) | Not applicable. | |
| 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. | ||
| Item 7. | Material to be Filed as Exhibits. | |
Exhibit A: Certain Information Required by Instruction C of Schedule 13D.
Exhibit B: Agreement to file Schedule 13D jointly. | ||
| 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.
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