Velarion · Company Intelligence
Compensation Brief
Fiscal year 2025 · Filings through 2026-09-11

Global Self Storage, Inc. (SELF)

CEO Mark Winmill was paid $693,476 in fiscal year 2025, ↓ down 14.7% from fiscal year 2024 (SEC filing 0001193125-26-191430 ↗): executive and director compensation, incentive-plan design, equity activity, and governance — every figure in this brief is traceable to its exact location in the company’s SEC filing — the document, the section, the page, and the table, linked directly.

$693,476 ↓
Mark Winmill total, FY2025
—
CEO pay percentile vs peers
—
CEO-to-median pay ratio
74%
Say-on-pay support, latest vote

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SELF's next annual pay disclosure, estimated May 3, 2027.est. Filing ↗

01

Summary Compensation Table — fiscal year 2025

Named executive officerSalaryBonusStock awardsOption awardsNon-equity incentivePension / NQDCAll otherTotal
Mark Winmill$467,000$17,962$128,748$0$0$0$79,766$693,476
Chief Executive Officer and President
Donald Klimoski198,0867,49456,15400034,301296,035
Senior Vice President - Operations, General Counsel, Secretary, and Chief Compliance Officer
Thomas O'Malley211,5469,33256,15400012,242289,274
Chief Financial Officer, Chief Accounting Officer, Treasurer, and Senior Vice President

A dash means the company reported no figure in that column; 0 means it reported zero. Figures are as printed in the filing, without adjustment.

Three-year trend — total compensation per named executive

Named executive officerFY2025 totalFY2024 totalFY2023 totalΔ FY2024→2025
Mark Winmill$693,476$813,323$593,068↓ −119,847
Donald Klimoski296,035348,399—↓ −52,364
Thomas O'Malley289,274359,876274,910↓ −70,602

Prior-year totals as disclosed in the corresponding proxy; deltas are computed values with the derivation shown in the register.

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$693,476 Mark Winmill total, FY2025

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Data as of September 11, 2026 · Source: 0001193125-26-191430 · Velarion Executive Compensation Database, deposited on Zenodo (doi:10.5281/zenodo.22283855).

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01c

Board of directors

One page per director: the seat, the committees and the fee table, read for one person at a time.

DirectorRoleFY2025 total
George B. LangaIndependent Director$28,000
Russell E. Burke IIIIndependent Director$16,250
Sally C. Carroll, EsqIndependent Director$27,500
William C. ZacharyIndependent Director$28,000
02

Equity transactions since the proxy statement was filed

Every insider equity transaction reported on Form 4 after the 2025 proxy statement — acquisitions, dispositions, exercises, and withholdings — and therefore not reflected in any table in that document.

InsiderRoleTransaction dateCodeSharesPriceValueSecuritySource
William C. ZacharyDirector2026-05-12A94$5$499CommonForm 4 ↗
Russell E. Burke IIIDirector2026-05-12A945499CommonForm 4 ↗
Mark Campbell WinmillDirector2026-05-14A4,000521,320CommonForm 4 ↗
William C. ZacharyDirector2026-08-11A19651,000CommonForm 4 ↗
WINMILL & CO. INC—2026-08-11A5,887530,409CommonForm 4 ↗
Russell E. Burke IIIDirector2026-08-11A19651,000CommonForm 4 ↗
WINMILL & CO. INC—2026-08-12A6,248532,192CommonForm 4 ↗
Russell E. Burke IIIDirector2026-08-13A1,62558,459CommonForm 4 ↗
WINMILL & CO. INC—2026-08-13A5,629529,277CommonForm 4 ↗
WINMILL & CO. INC—2026-08-14A6,029531,511CommonForm 4 ↗
WINMILL & CO. INC—2026-08-17A7,117537,936CommonForm 4 ↗
WINMILL & CO. INC—2026-08-18A5,736530,507CommonForm 4 ↗
WINMILL & CO. INC—2026-08-19A6,877537,163CommonForm 4 ↗
WINMILL & CO. INC—2026-08-20A6,901537,417CommonForm 4 ↗
WINMILL & CO. INC—2026-08-21A7,117538,805CommonForm 4 ↗
WINMILL & CO. INC—2026-08-24A8,022645,046CommonForm 4 ↗
WINMILL & CO. INC—2026-08-25A7,547642,695CommonForm 4 ↗
WINMILL & CO. INC—2026-08-26A7,761643,757CommonForm 4 ↗
Mark Campbell WinmillDirector2026-09-09A1,60058,256CommonForm 4 ↗
Mark Campbell WinmillDirector2026-09-09A2,058510,619CommonForm 4 ↗
Mark Campbell WinmillDirector2026-09-10A29251,507CommonForm 4 ↗
Mark Campbell WinmillDirector2026-09-10A505258CommonForm 4 ↗

Transaction codes per Form 4: A acquisition · S open-market sale · F tax withholding · M option exercise · G gift. Value = shares × price as reported. Dividend-equivalent and fractional-share accrual rows (derivative Class A, under $10,000 and under 2,000 shares) are aggregated per date; every row appears in full below.

03

Grants of plan-based awards — fiscal year 2025

ExecutiveAwardGrant dateThresholdTargetGrantedMaximumGrant-date fair value
Thomas O'MalleyPSU—————$56,154
Mark WinmillPSU—————128,748
Donald KlimoskiPSU—————56,154
03b

Vehicle mix — grant-date fair value by award type

Named executive officerTime-vested (RSU)Performance-vested (PSU)Options / SARs% performance-vested
Thomas O'Malley$0$56,154$0100.0%
Mark Winmill0128,7480100.0%
Donald Klimoski056,1540100.0%

% performance-vested = PSU grant-date fair value ÷ (RSU + PSU + Options), a computed value with the derivation shown in the register.

04

Outstanding equity awards at fiscal year-end 2025

ExecutiveAwardShares unvestedExercise priceMarket value unvested
Donald KlimoskiPSU17,675—$90,143
Thomas O'MalleyPSU17,675—90,143
Thomas O'MalleyPSU9,237—47,109
Donald KlimoskiPSU9,237—47,109
Mark WinmillPSU40,525—206,672
Mark WinmillPSU21,405—109,166
05

Incentive-plan design — the Compensation Discussion & Analysis

One of the primary objectives of the Compensation Committee is to ensure that the Company provides a competitive and comprehensive compensation program that allows us to attract and retain qualified and talented individuals who possess the skills and expertise necessary to lead, manage and grow the Company and who are accountable for the performance of the Company.

CEO STI target (% of salary)—
CEO LTI target (% of salary)—
Independent consultantWillis Towers Watson
Clawback policytrue
Anti-hedgingfalse
Anti-pledgingfalse
06

Say-on-pay — recent advisory votes

Meeting yearMeeting dateForAgainstAbstainSupportOutcome
20262026-06-163,710,1661,303,88270,92374%Passed
20252025-06-093,212,459720,32081,24681.68%Passed
20242024-06-053,206,646742,486224,90181.2%Passed
20232023-06-063,021,850366,239115,07889.19%Passed
20202020-06-123,056,222910,721167,95677.04%Passed

Rows are labeled by annual-meeting year, with the meeting date beside each; the vote held in a given year acts on the prior fiscal year's compensation.

Say-on-pay — history, company's computation

Meeting yearMeeting dateApproval — company's computation
20262026-06-1674%a
20252025-06-0981.68%b
20242024-06-0581.2%c

a. Approved under the standard stated in the filing — “Abstentions are not votes cast and will have no effect on the result of the vote on this proposal, although they will be considered present for the purpose of determining the presence of a quorum.”.

b. Approved under the standard stated in the filing — “Abstentions are not votes cast and will have no effect on the result of the vote on this proposal, although they will be considered present for the purpose of determining the presence of a quorum.”.

c. Approved under the standard stated in the filing — “Abstentions are not votes cast and will have no effect on the result of the vote on this proposal, although they will be considered present for the purpose of determining the presence of a quorum.”.

Approval percentages are the company's own reported computations under its own stated standard, not recomputed by Velarion. Where a company does not state a standard, none is assumed.

07

CEO pay ratio

Ratio (CEO : median employee)—
CEO total compensation—
Median employee compensation—
08

Director compensation — fiscal year 2025

DirectorCash feesStock awardsOption awardsNon-equity incentiveAll otherTotal
William C. ZacharyIndependent · Audit (Chair) · Compensation · Nominating/Governance · Committee of Continuing Directors$17$27,983$0$0$0$28,000
George B. LangaIndependent · Audit · Compensation · Nominating/Governance (Chair) · Committee of Continuing Directors28,000—00028,000
Sally C. Carroll, EsqIndependent · Audit · Compensation · Nominating/Governance · Committee of Continuing Directors27,500—00027,500
Russell E. Burke IIIIndependent · Audit · Compensation (Chair) · Nominating/Governance · Committee of Continuing Directors1716,23300016,250
Mark C. WinmillEmployee director · Board Chair · Executive Committee (Chair) · Committee of Continuing Directors000—00
09

Board fee structure and ownership guideline

Annual cash retainer$25,000
Annual equity retainer—
Per board meeting fee$11,000
Committee chair fees (audit / comp / nom-gov)500 / 500
Stock ownership guideline—
09b

Total cost of the board

ComponentFY2025
Cash retainers and fees$55,534
Equity awards (grant-date value)$44,216
All other compensation$0
Total cost of the board$99,750

Computed as the sum of the director compensation table rows above; inputs and formula shown in the register.

10b

Chief executive pay against the peer group

Most recent fiscal-year chief executive compensation at each disclosed peer, taken from that company's own proxy statement.

RankCompanyFYChief executiveSalaryStock awardsOption awardsNon-equity incentiveTotal
1Global Self Storage, Inc.2025Mark Winmill$467,000$128,748$0$0$693,476

Each peer's compensation is from its most recently filed proxy; fiscal years differ by company. Each peer's figures come from its own filings; the subject company is highlighted. Peers whose chief executive compensation is outside our coverage universe are stated as such, never left blank.

10d

Frequently asked questions

Who was the highest-paid executive at Global Self Storage, Inc. in fiscal 2025?
As disclosed, Mark Winmill (Chief Executive Officer and President) was the highest-paid executive at Global Self Storage, Inc. in fiscal 2025, with total compensation of $693,476.
How did shareholders vote on Global Self Storage, Inc.'s executive compensation?
As disclosed, 74% of shareholders supported Global Self Storage, Inc.'s executive compensation in the latest say-on-pay vote.
How much does Global Self Storage, Inc. spend in total on board compensation for fiscal 2025?
As disclosed, Global Self Storage, Inc. reported total board compensation of $99,750 for fiscal 2025.

Answers are drawn only from the figures disclosed in this brief and cited to their location in the source filing. Where a figure required for an answer is not disclosed, that is stated rather than estimated.

11

Source register

Each figure's location is given both for the eye (section · page · table · row · column) and for a script (table/row/column index and exact character span in the filed document). Any figure can be independently confirmed against the source.

#SupportsDocumentFiledAccessionLocation in document
1Section 01, Mark WinmillDEF 14A2026-04-290001193125-26-191430Section “Summary Compensation Table”. As printed: 693,476. Filing ↗machine: span 556666–556673
2Section 01, Donald KlimoskiDEF 14A2026-04-290001193125-26-191430Section “Summary Compensation Table”. As printed: 296,035. Filing ↗machine: span 578886–578893
3Section 01, Thomas O'MalleyDEF 14A2026-04-290001193125-26-191430Section “Summary Compensation Table” · page 35. As printed: 289,274. Filing ↗machine: span 567361–567368
4Section 03, Thomas O'Malley PSUDEF 14A2026-04-290001193125-26-191430Section “EXECUTIVE COMPENSATION” · grants of plan-based awards table. Filing ↗machine: t7 · r3 · c10 · span 563820–563826
5Section 03, Mark Winmill PSUDEF 14A2026-04-290001193125-26-191430Section “EXECUTIVE COMPENSATION” · grants of plan-based awards table. Filing ↗machine: t7 · r2 · c10 · span 552310–552317
6Section 03, Donald Klimoski PSUDEF 14A2026-04-290001193125-26-191430Section “EXECUTIVE COMPENSATION” · grants of plan-based awards table. Filing ↗machine: t7 · r4 · c10 · span 574563–574569
7Section 07, pay ratio10-K2026-03-250001193125-26-124051Section “CEO Pay Ratio”. As printed: —. Filing ↗
8Section 08, William C. ZacharyDEF 14A2026-04-290001193125-26-191430Section “Director Compensation”. As printed: 28,000. Filing ↗machine: t2 · r4 · c13 · span 255203–255411
9Section 08, George B. LangaDEF 14A2026-04-290001193125-26-191430Section “Director Compensation”. As printed: 28,000. Filing ↗machine: t2 · r3 · c3 · span 249828–250036
10Section 08, Sally C. Carroll, EsqDEF 14A2026-04-290001193125-26-191430Section “Director Compensation”. As printed: 27,500. Filing ↗machine: t2 · r5 · c3 · span 260374–260582
11Section 08, Russell E. Burke IIIDEF 14A2026-04-290001193125-26-191430Section “Director Compensation”. As printed: 16,250. Filing ↗machine: t2 · r2 · c13 · span 244637–244845
12Section 08, Mark C. WinmillDEF 14A2026-04-290001193125-26-191430Section “Director Compensation”. As printed: 0. Filing ↗
13Section 02, William C. Zachary 2026-05-12Form 42026-05-140001667715-26-000003Insider equity transaction reported since the proxy statement. Filing ↗
14Section 02, Russell E. Burke III 2026-05-12Form 42026-05-140001127962-26-000003Insider equity transaction reported since the proxy statement. Filing ↗
15Section 02, Mark Campbell Winmill 2026-05-14Form 42026-05-150001019264-26-000003Insider equity transaction reported since the proxy statement. Filing ↗
16Section 02, William C. Zachary 2026-08-11Form 42026-08-130001628873-26-000068Insider equity transaction reported since the proxy statement. Filing ↗
17Section 02, WINMILL & CO. INC 2026-08-11Form 42026-08-120001628873-26-000064Insider equity transaction reported since the proxy statement. Filing ↗
18Section 02, Russell E. Burke III 2026-08-11Form 42026-08-130001628873-26-000066Insider equity transaction reported since the proxy statement. Filing ↗
19Section 02, WINMILL & CO. INC 2026-08-12Form 42026-08-120001628873-26-000064Insider equity transaction reported since the proxy statement. Filing ↗
20Section 02, Russell E. Burke III 2026-08-13Form 42026-08-140001628873-26-000072Insider equity transaction reported since the proxy statement. Filing ↗
21Section 02, WINMILL & CO. INC 2026-08-13Form 42026-08-140001628873-26-000070Insider equity transaction reported since the proxy statement. Filing ↗
22Section 02, WINMILL & CO. INC 2026-08-14Form 42026-08-140001628873-26-000070Insider equity transaction reported since the proxy statement. Filing ↗
23Section 02, WINMILL & CO. INC 2026-08-17Form 42026-08-180001628873-26-000074Insider equity transaction reported since the proxy statement. Filing ↗
24Section 02, WINMILL & CO. INC 2026-08-18Form 42026-08-180001628873-26-000074Insider equity transaction reported since the proxy statement. Filing ↗
25Section 02, WINMILL & CO. INC 2026-08-19Form 42026-08-200001628873-26-000077Insider equity transaction reported since the proxy statement. Filing ↗
26Section 02, WINMILL & CO. INC 2026-08-20Form 42026-08-200001628873-26-000077Insider equity transaction reported since the proxy statement. Filing ↗
27Section 02, WINMILL & CO. INC 2026-08-21Form 42026-08-240001628873-26-000079Insider equity transaction reported since the proxy statement. Filing ↗
28Section 02, WINMILL & CO. INC 2026-08-24Form 42026-08-240001628873-26-000079Insider equity transaction reported since the proxy statement. Filing ↗
29Section 02, WINMILL & CO. INC 2026-08-25Form 42026-08-260001628873-26-000085Insider equity transaction reported since the proxy statement. Filing ↗
30Section 02, WINMILL & CO. INC 2026-08-26Form 42026-08-260001628873-26-000085Insider equity transaction reported since the proxy statement. Filing ↗
31Section 02, Mark Campbell Winmill 2026-09-09Form 42026-09-110001628873-26-000095Insider equity transaction reported since the proxy statement. Filing ↗
32Section 02, Mark Campbell Winmill 2026-09-09Form 42026-09-110001628873-26-000095Insider equity transaction reported since the proxy statement. Filing ↗
33Section 02, Mark Campbell Winmill 2026-09-10Form 42026-09-110001628873-26-000095Insider equity transaction reported since the proxy statement. Filing ↗
34Section 02, Mark Campbell Winmill 2026-09-10Form 42026-09-110001628873-26-000095Insider equity transaction reported since the proxy statement. Filing ↗
35Section 06, 2026 voteForm 8-K2026-06-160001193125-26-272611Item 5.07 · say-on-pay result. As reported: 74% (votes for as printed: 3,710,166). Filing ↗
36Section 06, 2025 voteForm 8-K2025-06-090000950170-25-083849Item 5.07 · say-on-pay result. As reported: 81.68% (votes for as printed: 3,212,459). Filing ↗
37Section 06, 2024 voteForm 8-K2024-06-050000950170-24-069152Item 5.07 · say-on-pay result. As reported: 81.2% (votes for as printed: 3,206,646). Filing ↗
38Section 01 trend, Δ column (computed)Computed——Δ = current-FY total − prior-FY total per named officer.machine: formula: Δ = FY(n) − FY(n−1)
39Section 03b vehicle mix (computed)Computed——RSU / PSU / Options grant-date fair values summed per officer from the grants table; % performance-vested = PSU ÷ (RSU+PSU+Options).machine: formula: sums + PSU ratio
40Section 09b board cost (computed)Computed——Cash 55,534 + equity 44,216 + all other 0 = 99,750, summed across the director compensation table rows.machine: formula: Σ = 99,750
41Global Self Storage, Inc. (subject), Section 10b CEO totalDEF 14A2026-04-290001193125-26-191430CEO total compensation as printed in Global Self Storage, Inc.'s own proxy. As printed: 693,476. Filing ↗machine: span 556666–556673

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