Form 8-K

8-K — National Storage Affiliates Trust

Accession: 0001628280-26-030498

Filed: 2026-05-05

Period: 2026-05-05

CIK: 0001618563

SIC: 6798 (REAL ESTATE INVESTMENT TRUSTS)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — nsa-20260505.htm (Primary)

EX-99.1 (ex991-q12026erss.htm)

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8-K

8-K (Primary)

Filename: nsa-20260505.htm · Sequence: 1

nsa-20260505

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 5, 2026

National Storage Affiliates Trust

(Exact name of registrant as specified in its charter)

Maryland

001-37351

46-5053858

(State or other jurisdiction of incorporation or organization)

(Commission File Number)

(I.R.S. Employer Identification No.)

8400 East Prentice Avenue, 9th Floor

Greenwood Village, Colorado 80111

(Address of principal executive offices)

(720) 630-2600

(Registrant's telephone number, including area code)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbols Name of each exchange on which registered

Common Shares of Beneficial Interest, $0.01 par value per share NSA New York Stock Exchange

Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share NSA Pr A New York Stock Exchange

Series B Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share NSA Pr B New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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ITEM 2.02. Results of Operations and Financial Condition.

On May 5, 2026, National Storage Affiliates Trust (the "Company") issued an earnings release and supplemental schedules announcing its financial results for the quarter ended March 31, 2026. A copy of the earnings release and supplemental schedules are attached hereto as Exhibit 99.1 and is incorporated by reference herein.

The full text of the earnings release and supplemental schedules are also available through the Company's website at www.nsastorage.com. The information contained on the Company's website is not incorporated by reference herein.

ITEM 9.01. Financial Statements and Exhibits.

The following exhibits are furnished with this report:

Exhibit Number Description

99.1

First Quarter 2026 Earnings Release dated May 5, 2026

101 Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document.

104 The cover page from this Current Report on Form 8-K, formatted as Inline XBRL.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

NATIONAL STORAGE AFFILIATES TRUST

By: /s/ David G. Cramer

David G. Cramer

President and Chief Executive Officer

Date: May 5, 2026

EX-99.1

Filename: ex991-q12026erss.htm · Sequence: 2

Document

Table of Contents

Page

Earnings Release

Consolidated Statements of Operations

Consolidated Balance Sheets

Schedule 1 - Funds From Operations and Core Funds From Operations

Schedule 2 - Other Non-GAAP Financial Measurements

Schedule 3 - Portfolio Summary

Schedule 4 - Debt and Equity Capitalization

Schedule 5 - Summarized Information for Unconsolidated Real Estate Ventures

Schedule 6 - Same Store Performance Summary By MSA

Schedule 7 - Same Store Operating Data - Trailing Five Quarters

Schedule 8 - Reconciliation of Same Store Data and Net Operating Income to Net Income

Schedule 9 - Selected Financial Information

Glossary

May 5, 2026

National Storage Affiliates Trust Reports First Quarter 2026 Results

GREENWOOD VILLAGE, Colo. - (BUSINESS WIRE) - National Storage Affiliates Trust ("NSA" or the "Company") (NYSE: NSA) today reported the Company’s first quarter 2026 results.

First Quarter 2026 Highlights

•Reported net income of $27.7 million for the first quarter of 2026, an increase of 41.8% compared to the first quarter of 2025. Reported diluted earnings per share of $0.16 for the first quarter of 2026 compared to $0.10 for the first quarter of 2025.

•Reported core funds from operations ("Core FFO") of $76.8 million, or $0.57 per share for the first quarter of 2026, an increase of 5.6% per share compared to the first quarter of 2025.

•Reported an increase in same store net operating income ("NOI") of 2.0% for the first quarter of 2026 compared to the same period in 2025, driven by a 0.2% increase in same store total revenues and a 3.9% decrease in same store property operating expenses.

•Reported same store period-end occupancy of 84.5% as of March 31, 2026, an increase of 70 basis points compared to March 31, 2025.

•Acquired one wholly-owned self storage property for approximately $10.4 million during the first quarter of 2026.

•Completed the sale of three wholly-owned self storage properties to unaffiliated third parties for net proceeds of approximately $20.6 million.

•As previously announced, the Company has entered into a definitive merger agreement with Public Storage, under which the Company will be acquired in an all-stock transaction valued at an enterprise value of approximately $10.5 billion. The merger is expected to close in the third quarter of 2026, subject to the approval of the Company's equity holders, and satisfaction of other customary closing conditions.

Highlights Subsequent to Quarter-End

•Completed the sale of three wholly-owned self storage properties to an unaffiliated third party for approximately $5.7 million, that were classified as held for sale as of March 31, 2026.

•As of April 30, 2026, same store period-end occupancy was 84.9%, an increase of 90 basis points compared to April 30, 2025.

Financial Results

($ in thousands, except per share and unit data)

Three Months Ended March 31,

2026 2025 Change

Net income $ 27,681 $ 19,519 41.8 %

Funds From Operations ("FFO")(1)

$ 65,999 $ 70,978 (7.0) %

Add acquisition costs

811 403 101.2 %

Add integration and executive severance costs(2)

— 2,042 — %

Add merger related costs 9,981 — — %

Core FFO(1)

$ 76,791 $ 73,423 4.6 %

Earnings per share - basic and diluted

$ 0.16 $ 0.10 60.0 %

FFO per share and unit(1)

$ 0.49 $ 0.52 (5.8) %

Core FFO per share and unit(1)

$ 0.57 $ 0.54 5.6 %

(1)

Non-GAAP financial measures, including FFO, Core FFO and NOI, are defined in the Glossary in the supplemental financial information and, where appropriate, reconciliations of these measures and other non-GAAP financial measures to their most directly comparable GAAP measures are included in the Schedules to this press release and in the supplemental financial information.

(2) Integration costs relate to expenses incurred as a part of the internalization of the PRO structure.

Net income increased $8.2 million for the first quarter of 2026 as compared to the same period in 2025. This increase was primarily due to an increase in earnings from our unconsolidated real estate ventures, a decrease in property operating expenses and a decrease in depreciation expense.

The decrease in FFO per share and unit for the first quarter of 2026 was primarily driven by merger related costs of $10.0 million. The increase in Core FFO per share and unit for the first quarter of 2026 was primarily driven by an increase in same store NOI and a decrease in interest expense.

Same Store Operating Results (735 Stores)

($ in thousands, except per square foot data)

Three Months Ended March 31,

2026 2025 Change

Total revenues

$ 164,221 $ 163,852 0.2 %

Property operating expenses

48,396 50,343 (3.9) %

Net Operating Income (NOI)

$ 115,825 $ 113,509 2.0 %

NOI Margin 70.5 % 69.3 % 1.2 %

Average Occupancy

84.2 % 84.1 % 0.1 %

Average Annualized Rental Revenue Per Occupied Square Foot

$ 15.88 $ 15.78 0.6 %

Year-over-year same store total revenue increased 0.2% for the first quarter of 2026 as compared to the same period in 2025. The increase for the first quarter was driven by a 10 basis point increase in average occupancy and a 0.6% increase in average annualized rental revenue per occupied square foot. Markets which generated above portfolio average same store total revenue growth include: Portland, San Juan, PR and Colorado Springs. Markets which generated below portfolio average same store total revenue growth include: Riverside-San Bernardino, Atlanta and Phoenix.

Year-over-year same store property operating expenses decreased 3.9% for the first quarter of 2026 as compared to the same period in 2025. The decrease for the first quarter of 2026 was primarily driven by decreases in personnel, utilities and repairs and maintenance costs.

Investment and Disposition Activity

During the first quarter, NSA invested $10.4 million in the acquisition of one wholly-owned self storage property, consisting of approximately 47,000 rentable square feet configured in approximately 500 storage units.

During the first quarter, NSA completed the sale of three wholly-owned self storage properties, consisting of approximately 199,000 rentable square feet configured in approximately 1,500 storage units for approximately $20.6 million.

Balance Sheet

As of March 31, 2026, NSA has approximately $530.6 million of available capacity on its $950.0 million revolving line of credit.

Common Share Dividends

On February 12, 2026, NSA's Board of Trustees declared a quarterly cash dividend of $0.57 per common share. The first quarter 2026 dividend was paid on March 31, 2026 to shareholders of record as of March 13, 2026.

2026 Guidance

In light of the Company's proposed merger with Public Storage announced on March 16, 2026, the Company will no longer provide guidance nor is it affirming past guidance.

Supplemental Financial Information

The full text of this earnings release and supplemental financial information, including certain financial information referenced in this release, are available on NSA's website at www.nsastorage.com and as exhibit 99.1 to the Company's Form 8-K furnished to the SEC on May 5, 2026.

Non-GAAP Financial Measures & Glossary

This press release contains certain non-GAAP financial measures. These non-GAAP measures are presented because NSA's management believes these measures help investors understand NSA's business, performance and ability to earn and distribute cash to its shareholders by providing perspectives not immediately apparent from net income (loss). These measures are also frequently used by securities analysts, investors and other interested parties. The presentations of FFO, Core FFO and NOI in this press release are not intended to be considered in isolation or as a substitute for, or superior to, the financial information prepared and presented in accordance with GAAP. In addition, NSA's method of calculating these measures may be different from methods used by other companies, and, accordingly, may not be comparable to similar measures as calculated by other companies that do not use the same methodology as NSA. These measures, and other words and phrases used herein, are defined in the Glossary in the supplemental financial information and, where appropriate, reconciliations of these measures and other non-GAAP financial measures to their most directly comparable GAAP measures are included in the Schedules to this press release and in the supplemental financial information.

About National Storage Affiliates Trust

National Storage Affiliates Trust is a real estate investment trust headquartered in Greenwood Village, Colorado, focused on the ownership, operation and acquisition of self storage properties predominantly located within the top 100 metropolitan statistical areas throughout the United States. As of March 31, 2026, the Company held ownership interests in and operated 1,061 self storage properties, located in 37 states and Puerto Rico with approximately 69.3 million rentable square feet, excluding three properties classified as held for sale, that were sold to a third party in April 2026. NSA is one of the largest owners and operators of self storage properties among public and private companies in the United States. For more information, please visit the Company’s website at www.nsastorage.com. NSA is included in the MSCI US REIT Index (RMS/RMZ), the Russell 1000 Index of Companies and the S&P MidCap 400 Index.

NOTE REGARDING FORWARD LOOKING STATEMENTS

Certain statements contained in this press release constitute forward-looking statements as such term is defined in Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and such statements are intended to be covered by the safe harbor provided by the same. Forward-looking statements are subject to substantial risks and uncertainties, many of which are difficult to predict and are generally beyond the Company's control. These forward-looking statements include information about possible or assumed future results of the Company's business, financial condition, liquidity, results of operations, plans and objectives. Changes in any circumstances may cause the Company's actual results to differ significantly from those expressed in any forward-looking statement. When used in this release, the words "believe," "expect," "anticipate," "estimate," "plan," "continue," "intend," "should," "may" or similar expressions are intended to identify forward-looking statements. Statements regarding the following subjects, among others, may be forward-looking: market trends in the Company's industry, interest rates, inflation, the debt and lending markets or the general economy; the Company's business and investment strategy; the risks associated with our ability to consummate the mergers with Public Storage and the timing and closing of the mergers including, among other things, the ability of the Company to obtain equity holder approval required to consummate the mergers, the satisfaction or waiver of other conditions to closing in the Merger Agreement, unanticipated difficulties or expenditures relating to the mergers, potential difficulties in employee retention as a result of the mergers, the occurrence of any event, change or other circumstances that could give rise to the termination of the mergers and the outcome of legal proceedings that may be instituted related to the mergers; the acquisition and disposition of properties, including those under contract and the Company's ability to execute on its acquisition pipeline; and the Company's guidance estimates for the year ending December 31, 2026. For a further list and description of such risks and uncertainties, see the Company's most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q and Current Reports on Form 8-K filed with the Securities and Exchange Commission, and the other documents filed by the Company with the Securities and Exchange Commission. The forward-looking statements, and other risks, uncertainties and factors are based on the Company's beliefs, assumptions and expectations of its future performance, taking into account all information currently available to the Company. Forward-looking statements are not predictions of future events. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

Contact:

National Storage Affiliates Trust

Investor/Media Relations

George Hoglund, CFA

Vice President - Investor Relations

720.630.2160

ghoglund@nsareit.net

National Storage Affiliates Trust

Consolidated Statements of Operations

(in thousands, except per share amounts) (unaudited)

Three Months Ended March 31,

2026 2025

REVENUE

Rental revenue $ 168,214 $ 169,475

Other property-related revenue 5,586 6,744

Management fees and other revenue 11,601 12,135

Total revenue 185,401 188,354

OPERATING EXPENSES

Property operating expenses 52,034 55,104

General and administrative expenses 13,231 13,145

Depreciation and amortization 46,140 48,116

Other 3,098 4,476

Total operating expenses 114,503 120,841

OTHER (EXPENSE) INCOME

Interest expense (39,257) (40,475)

Equity in earnings (losses) of unconsolidated real estate ventures

1,155 (5,739)

Acquisition and integration costs (811) (2,445)

Merger related costs (9,981) —

Non-operating (expense) income (302) 360

Gain on sale of self storage properties 6,458 1,425

Other expense, net (42,738) (46,874)

Income before income taxes 28,160 20,639

Income tax expense (479) (1,120)

Net income 27,681 19,519

Net income attributable to noncontrolling interests

(9,901) (6,525)

Net income attributable to National Storage Affiliates Trust 17,780 12,994

Distributions to preferred shareholders

(5,153) (5,114)

Net income attributable to common shareholders

$ 12,627 $ 7,880

Earnings per share - basic and diluted $ 0.16 $ 0.10

Weighted average shares outstanding - basic and diluted

77,093 76,372

National Storage Affiliates Trust

Consolidated Balance Sheets

(dollars in thousands, except per share amounts)

(unaudited)

March 31, December 31,

2026 2025

ASSETS

Real estate

Self storage properties $ 5,832,905 $ 5,814,854

Less accumulated depreciation (1,256,764) (1,213,537)

Self storage properties, net 4,576,141 4,601,317

Cash and cash equivalents 27,648 23,328

Restricted cash 721 310

Debt issuance costs, net 2,161 2,890

Investment in unconsolidated real estate ventures 227,267 231,779

Other assets, net 178,470 185,403

Assets held for sale, net 1,086 14,519

Operating lease right-of-use assets 20,264 20,569

Total assets $ 5,033,758 $ 5,080,115

LIABILITIES AND EQUITY

Liabilities

Debt financing $ 3,416,836 $ 3,405,102

Accounts payable and accrued liabilities 97,724 94,627

Interest rate swap liabilities 1,134 4,052

Operating lease liabilities 22,320 22,620

Deferred revenue 20,655 19,931

Total liabilities 3,558,669 3,546,332

Equity

Preferred shares of beneficial interest, par value $0.01 per share. 50,000,000 authorized, 14,801,345 and 14,704,845 issued (in series) and outstanding at March 31, 2026 and December 31, 2025, respectively, at liquidation preference

343,542 341,130

Common shares of beneficial interest, par value $0.01 per share. 250,000,000 shares authorized, 77,137,402 and 77,089,734 shares issued and outstanding at March 31, 2026 and December 31, 2025, respectively

771 771

Additional paid-in capital 1,245,845 1,251,961

Distributions in excess of earnings (683,581) (652,240)

Accumulated other comprehensive income 6,184 4,416

Total shareholders' equity 912,761 946,038

Noncontrolling interests 562,328 587,745

Total equity 1,475,089 1,533,783

Total liabilities and equity $ 5,033,758 $ 5,080,115

Supplemental Schedule 1

Funds From Operations and Core Funds From Operations

(in thousands, except per share and unit amounts) (unaudited)

Reconciliation of Net Income to FFO and Core FFO

Three Months Ended March 31,

2026 2025

Net income $ 27,681 $ 19,519

Add (subtract):

Real estate depreciation and amortization 45,707 47,661

Equity in (earnings) losses of unconsolidated real estate ventures (1,155) 5,739

Company's share of FFO in unconsolidated real estate ventures 5,792 5,052

Gain on sale of self storage properties (6,458) (1,425)

Distributions to preferred shareholders and unitholders (5,568) (5,568)

FFO attributable to common shareholders, OP unitholders, and LTIP unitholders

65,999 70,978

Add (subtract):

Acquisition costs 811 403

Integration costs(1)

— 2,042

Merger related costs 9,981 —

Core FFO attributable to common shareholders, OP unitholders, and LTIP unitholders

$ 76,791 $ 73,423

Weighted average shares and units outstanding - FFO and Core FFO:(2)

Weighted average shares outstanding - basic 77,093 76,372

Weighted average restricted common shares outstanding 26 21

Weighted average OP units outstanding

51,162 52,147

Weighted average DownREIT OP unit equivalents outstanding

5,769 5,769

Weighted average LTIP units outstanding

979 925

Total weighted average shares and units outstanding - FFO and Core FFO

135,029 135,234

FFO per share and unit $ 0.49 $ 0.52

Core FFO per share and unit $ 0.57 $ 0.54

(1) Integration costs relate to expenses incurred as a part of the internalization of the PRO structure.

(2) NSA combines OP units and DownREIT OP units with common shares because, after the applicable lock-out periods, OP units in the Company's operating partnership are redeemable for cash or, at NSA's option, exchangeable for common shares on a one-for-one basis and DownREIT OP units are also redeemable for cash or, at NSA's option, exchangeable for OP units in the Company's operating partnership on a one-for-one basis, subject to certain adjustments in each case. LTIP units may also, under certain circumstances, be convertible into or exchangeable for common shares (or other units that are convertible into or exchangeable for common shares). See footnote 3 for additional discussion of LTIP units in the calculation of FFO and Core FFO per share and unit.

Supplemental Schedule 1 (continued)

Funds From Operations and Core Funds From Operations

(in thousands, except per share and unit amounts) (unaudited)

Reconciliation of Earnings Per Share - Diluted to FFO and Core FFO Per Share and Unit

Three Months Ended March 31,

2026 2025

Earnings per share - diluted $ 0.16 $ 0.10

Impact of the difference in weighted average number of shares(3)

(0.07) (0.04)

Impact of GAAP accounting for noncontrolling interests, two-class method and treasury stock method(4)

0.07 0.04

Add real estate depreciation and amortization 0.34 0.35

Add equity in (earnings) losses of unconsolidated real estate ventures (0.01) 0.04

Add Company's share of FFO in unconsolidated real estate ventures 0.05 0.04

Subtract gain on sale of self storage properties (0.05) (0.01)

FFO per share and unit

0.49 0.52

Add acquisition costs

0.01 —

Add integration costs — 0.02

Add merger related costs 0.07 —

Core FFO per share and unit

$ 0.57 $ 0.54

(3)

Adjustment accounts for the difference between the weighted average number of shares used to calculate diluted earnings per share and the weighted average number of shares used to calculate FFO and Core FFO per share and unit. Diluted earnings per share is calculated using the two-class method for the company's restricted common shares and the treasury stock method for certain unvested LTIP units, and assumes the conversion of vested LTIP units into OP units on a one-for-one basis. The computation of weighted average shares and units for FFO and Core FFO per share and unit includes all restricted common shares and LTIP units that participate in distributions.

(4) Represents the effect of adjusting the numerator to consolidated net income prior to GAAP allocations for noncontrolling interests, after deducting preferred share and unit distributions, and before the application of the two-class method and treasury stock method, as described in footnote 3.

Supplemental Schedule 2

Other Non-GAAP Financial Measurements

(dollars in thousands) (unaudited)

Net Operating Income

Three Months Ended March 31,

2026 2025

Net income $ 27,681 $ 19,519

(Subtract) add:

Management fees and other revenue (11,601) (12,135)

General and administrative expenses 13,231 13,145

Depreciation and amortization 46,140 48,116

Other 3,098 4,476

Interest expense 39,257 40,475

Equity in (earnings) losses of unconsolidated real estate ventures (1,155) 5,739

Acquisition and integration costs 811 2,445

Merger related costs 9,981 —

Non-operating expense (income) 302 (360)

Gain on sale of self storage properties (6,458) (1,425)

Income tax expense 479 1,120

Net Operating Income

$ 121,766 $ 121,115

Supplemental Schedule 2 (continued)

Other Non-GAAP Financial Measurements

(dollars in thousands) (unaudited)

EBITDA and Adjusted EBITDA

Three Months Ended March 31,

2026 2025

Net income $ 27,681 $ 19,519

Add:

Depreciation and amortization 46,140 48,116

Company's share of unconsolidated real estate venture depreciation and amortization

4,903 5,411

Interest expense 39,257 40,475

Income tax expense 479 1,120

EBITDA

118,460 114,641

Add (subtract):

Acquisition costs 811 403

Effect of hypothetical liquidation at book value (HLBV) accounting for unconsolidated 2024 Joint Venture(1)

(266) 5,381

Gain on sale of self storage properties (6,458) (1,425)

Integration costs, excluding equity-based compensation(2)

— 930

Merger related costs 9,981 —

Equity-based compensation expense(3)

2,420 3,079

Adjusted EBITDA

$ 124,948 $ 123,009

(1)

Reflects the non-cash impact of applying HLBV to the 2024 Joint Venture, which allocates GAAP income (loss) on a hypothetical liquidation of the underlying joint venture at book value as of the reporting date.

(2) Integration costs relate to expenses incurred as a part of the internalization of the PRO structure.

(3)

Equity-based compensation expense is a non-cash item recorded within general and administrative expenses and acquisition and integration costs in our consolidated statements of operations. For the three months ended March 31, 2025, $1.1 million relates to the internalization of the PRO structure and is included in acquisition and integration costs.

Supplemental Schedule 3

Portfolio Summary

As of March 31, 2026

(dollars in thousands) (unaudited)

Wholly-Owned Store Data by State (Consolidated) Total Operated Store Data by State (Consolidated & Unconsolidated)

State/Territories Stores Units Rentable Square Feet Occupancy at Period End State/Territories Stores Units Rentable Square Feet Occupancy at Period End

Texas 171 79,025 11,035,604 84.5 % Texas 198 96,120 13,146,684 85.0 %

California 86 51,676 6,498,723 84.0 % Florida 105 60,399 6,803,020 82.7 %

Florida 78 45,375 5,087,342 82.3 % California 99 58,673 7,345,276 84.4 %

Oregon 70 29,262 3,661,566 87.6 % Oregon 70 29,262 3,661,566 87.6 %

Georgia 47 20,487 2,818,960 80.7 % Georgia 69 32,054 4,400,035 81.7 %

Arizona 34 18,887 2,174,575 78.9 % Oklahoma 52 22,416 3,270,982 83.0 %

North Carolina 34 16,793 2,072,412 86.6 % Arizona 36 19,896 2,284,705 78.7 %

Oklahoma 33 15,307 2,141,378 83.5 % North Carolina 34 16,793 2,072,412 86.6 %

Louisiana 25 11,459 1,388,365 78.7 % Ohio 27 14,898 1,854,692 85.8 %

Pennsylvania 22 10,442 1,296,270 87.7 % Alabama 26 12,293 1,806,736 78.4 %

Colorado 21 9,118 1,145,312 86.1 % Michigan 25 16,001 2,030,948 87.3 %

Washington 19 6,643 871,889 86.8 % Pennsylvania 25 12,077 1,456,940 87.7 %

Puerto Rico 15 12,856 1,379,381 88.2 % Louisiana 25 11,459 1,388,365 78.7 %

Nevada 15 7,564 963,252 85.6 % Kansas 22 8,432 1,121,022 86.5 %

New Hampshire 15 7,160 890,320 84.9 % Tennessee 21 10,907 1,398,877 86.2 %

Kansas 15 5,577 721,923 86.3 % Colorado 21 9,118 1,145,312 86.1 %

Indiana 12 6,529 827,464 79.8 % New Jersey 20 13,513 1,603,307 86.6 %

Alabama 12 6,503 956,385 73.4 % Indiana 19 9,820 1,286,069 82.4 %

New Mexico 12 5,773 750,098 79.9 % Nevada 19 9,450 1,247,570 85.1 %

Other(1)

63 35,983 4,423,883 84.9 % Washington 19 6,643 871,889 86.8 %

Total

799 402,419 51,105,102 83.9 % Puerto Rico 15 12,856 1,379,381 88.2 %

Massachusetts 15 11,060 1,210,211 86.6 %

New Hampshire 15 7,160 890,320 84.9 %

New Mexico 12 5,773 750,098 79.9 %

Minnesota 11 5,562 709,345 86.1 %

Illinois 10 6,772 729,163 82.8 %

Other(2)

51 28,076 3,471,170 84.2 %

Total 1,061 547,483 69,336,095 84.3 %

(1)

Other states in NSA's owned portfolio as of March 31, 2026 include Connecticut, Idaho, Illinois, Iowa, Kentucky, Maryland, Massachusetts, Minnesota, Missouri, New Jersey, New York, Ohio, South Carolina, Tennessee and Virginia.

(2)

Other states in NSA's operated portfolio as of March 31, 2026 include Connecticut, Delaware, Idaho, Iowa, Kentucky, Maryland, Mississippi, Missouri, New York, Rhode Island, South Carolina and Virginia.

Supplemental Schedule 3 (continued)

Portfolio Summary

(dollars in thousands) (unaudited)

2026 Acquisition Activity

Self Storage Properties Acquired

During the Quarter Ended:(3)

Summary of Investment

Stores Units Rentable Square Feet Cash and Acquisition Costs Value of Equity Other Total

March 31, 2026 1 468 46,780 $ 10,418 $ — $ 29 $ 10,447

2026 Disposition & Divestiture Activity

Dispositions Closed During the Quarter Ended:(4)

Stores Units Rentable Square Feet Net Proceeds

Self Storage Properties sold to 3rd Parties

March 31, 2026 3 1,461 198,603 $ 20,596

(3)

NSA through its wholly-owned portfolio acquired one self storage property located in Alabama.

(4)

NSA disposed of three self storage properties located in Georgia.

Supplemental Schedule 4

Debt and Equity Capitalization BBB Rated

As of March 31, 2026 (Watch Developing)

(unaudited) by Kroll Bond Rating Agency

Debt Summary (dollars in thousands)

Effective Interest Rate(1)

Basis of Rate Maturity Date 2026 2027 2028 2029 2030 2031 2032 Thereafter Total

Credit Facility:

Revolving line of credit(2)

5.08%

Variable(3)

January 2027 $ — $ 412,400 $ — $ — $ — $ — $ — $ — $ 412,400

Term loan - Tranche D 4.01% Swapped To Fixed July 2026 275,000 — — — — — — — 275,000

Term loan - Tranche E 4.91%

Swapped To Fixed(3)

March 2027 — 130,000 — — — — — — 130,000

Term loan facility - 2028 4.17% Swapped To Fixed December 2028 — — 75,000 — — — — — 75,000

Term loan facility - April 2029 3.77% Swapped To Fixed April 2029 — — — 100,000 — — — — 100,000

Term loan facility - June 2029 5.07% Swapped To Fixed June 2029 — — — 285,000 — — — — 285,000

May 2026 Senior Unsecured Notes 2.16% Fixed May 2026 35,000 — — — — — — — 35,000

October 2026 Senior Unsecured Notes 6.46% Fixed October 2026 65,000 — — — — — — — 65,000

July 2028 Senior Unsecured Notes 5.75% Fixed July 2028 — — 120,000 — — — — — 120,000

September 2028 Senior Unsecured Notes 5.40% Fixed September 2028 — — 75,000 — — — — — 75,000

October 2028 Senior Unsecured Notes 6.55% Fixed October 2028 — — 100,000 — — — — — 100,000

2029 Senior Unsecured Notes 3.98% Fixed August 2029 — — — 100,000 — — — — 100,000

August 2030 Senior Unsecured Notes 2.99% Fixed August 2030 — — — — 150,000 — — — 150,000

October 2030 Senior Unsecured Notes 6.66% Fixed October 2030 — — — — 35,000 — — — 35,000

November 2030 Senior Unsecured Notes 2.72% Fixed November 2030 — — — — 75,000 — — — 75,000

May 2031 Senior Unsecured Notes 3.00% Fixed May 2031 — — — — — 90,000 — — 90,000

August 2031 Senior Unsecured Notes 4.08% Fixed August 2031 — — — — — 50,000 — — 50,000

September 2031 Senior Unsecured Notes 5.55% Fixed September 2031 — — — — — 125,000 — — 125,000

November 2031 Senior Unsecured Notes 2.81% Fixed November 2031 — — — — — 175,000 — — 175,000

August 2032 Senior Unsecured Notes 3.09% Fixed August 2032 — — — — — — 100,000 — 100,000

November 2032 Senior Unsecured Notes 5.06% Fixed November 2032 — — — — — — 200,000 — 200,000

May 2033 Senior Unsecured Notes 3.10% Fixed May 2033 — — — — — — — 55,000 55,000

October 2033 Senior Unsecured Notes 6.73% Fixed October 2033 — — — — — — — 50,000 50,000

November 2033 Senior Unsecured Notes 2.96% Fixed November 2033 — — — — — — — 125,000 125,000

2034 Senior Unsecured Notes 5.74% Fixed September 2034 — — — — — — — 150,000 150,000

2036 Senior Unsecured Notes 3.06% Fixed November 2036 — — — — — — — 75,000 75,000

Fixed rate mortgages payable 3.53% Fixed August 2027 - October 2031 — 84,900 88,000 — — 25,141 — — 198,041

Total Principal/Weighted Average

4.42% 3.7 years $ 375,000 $ 627,300 $ 458,000 $ 485,000 $ 260,000 $ 465,141 $ 300,000 $ 455,000 $ 3,425,441

Weighted average effective interest rate of maturing debt 4.26% 4.92% 5.04% 4.58% 3.41% 3.79% 4.40% 4.32%

Unamortized debt issuance costs and debt premium, net

(8,605)

Total Debt

$ 3,416,836

(1)

Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable.

(2)

NSA may, at its election, extend the maturity date of the revolving line of credit to January 2028, subject to meeting customary conditions and payment of an extension fee.

(3)

For the $950 million revolving line of credit, the effective interest rate is calculated based on Daily Simple SOFR plus an applicable margin of 1.45% and excludes fees which range from 0.15% to 0.20% for unused borrowings. $125.0 million of the Tranche E term loan is subject to interest rate swaps, the maturity of which extends through the Tranche E maturity.

Supplemental Schedule 4 (continued)

Debt and Equity Capitalization

As of March 31, 2026

(unaudited)

Debt Ratios

Covenant

Amount

Net Debt to Annualized Current Quarter Adjusted EBITDA n/a 6.8x

Trailing Twelve Month Fixed Charge Coverage Ratio

> 1.5x 2.6x

Total Leverage Ratio < 60.0% 46.9%

Preferred Shares and Units

Outstanding

6.000% Series A cumulative redeemable preferred shares of beneficial interest 9,133,217

6.000% Series B cumulative redeemable preferred shares of beneficial interest 4,608,445

Preferred shares of beneficial interest(4)

13,741,662

6.000% Series A-1 cumulative redeemable preferred units 1,096,711

Common Shares and Units

Outstanding

Common shares of beneficial interest 77,106,106

Restricted common shares 31,296

Total shares outstanding

77,137,402

Operating partnership units 51,074,863

DownREIT operating partnership unit equivalents

5,769,214

Total operating partnership units

56,844,077

Long-term incentive plan units 933,045

Total common shares and units outstanding

134,914,524

(4)

The Company's balance sheet at March 31, 2026 reflects 14,801,345 preferred shares of beneficial interest, which includes 5,668,128 Series B Preferred Shares issued and outstanding. We have reflected 13,741,662 preferred shares herein, which corresponds to the $343.5 million liquidation preference reflected on the balance sheet at March 31, 2026. As part of a 2023 property acquisition of 15 properties from one of the Company's former participating regional operators (the "Contributor"), the Company recorded a $26.1 million promissory note receivable from the Contributor, and the Contributor used the loan proceeds to acquire $26.1 million of OP equity. The promissory note bears interest at a rate equivalent to the dividends paid on 1,059,683 Series B Preferred Shares. As a result of these agreements, in accordance with GAAP, the $26.1 million promissory note receivable, interest income on the promissory note receivable, $26.1 million of Series B Preferred Shares value, and dividends on such Series B Preferred Shares have been offset for presentation purposes in the accompanying consolidated balance sheets and consolidated statements of operations.

Supplemental Schedule 5

Summarized Information for Unconsolidated Real Estate Ventures

(dollars in thousands) (unaudited)

Real Estate Venture Balance Sheet Data as of March 31, 2026

Number of Stores at March 31,

Occupancy at Period End

Real Estate Ventures

Carrying Value of NSA's Investment(1)

Gross Book Value of Real Estate Assets Outstanding Debt 2026 2025 Total Rentable Square Feet

1Q 2026

1Q 2025

2016 Joint Venture $ 93,577 $ 932,596 $ 358,713 81 81 5,689,659 85.3 % 85.6 %

2018 Joint Venture 84,979 1,288,060 646,587 104 104 7,871,784 85.9 % 84.5 %

2023 Joint Venture 47,557 197,929 — 21 18 1,449,042 83.8 % 70.9 %

2024 Joint Venture 1,154 347,271 209,314 56 56 3,220,508 85.5 % 84.2 %

Total $ 227,267 $ 2,765,856 $ 1,214,614 262 259 18,230,993 85.5 % 83.9 %

Combined Operating Information(2)

Three Months Ended March 31, 2026

2016 Joint Venture 2018 Joint Venture 2023 Joint Venture 2024 Joint Venture Total

Total revenue $ 22,167 $ 28,177 $ 3,627 $ 9,126 $ 63,097

Property operating expenses 7,439 9,320 1,277 3,503 21,539

Net operating income 14,728 18,857 2,350 5,623 41,558

Supervisory, administrative and other expenses

(1,633) (1,783) (293) (512) (4,221)

Depreciation and amortization (5,612) (8,903) (1,965) (3,132) (19,612)

Interest expense (3,269) (7,144) — (3,234) (13,647)

Non-operating (expense) income (51) (86) 4 36 (97)

Net income (loss) $ 4,163 $ 941 $ 96 $ (1,219) $ 3,981

Add (subtract):

Unconsolidated real estate venture depreciation and amortization

5,612 8,903 1,965 3,132 19,612

FFO and Core FFO for unconsolidated real estate ventures

$ 9,775 $ 9,844 $ 2,061 $ 1,913 $ 23,593

(1) NSA's investment in its unconsolidated real estate ventures are recorded under the equity method of accounting. Under the equity method, NSA’s investments in unconsolidated real estate ventures are stated at cost and adjusted for NSA’s share of net earnings or losses and reduced by distributions.

(2) Values represent entire unconsolidated real estate ventures at 100%, not NSA's proportionate share. NSA's ownership in each of the unconsolidated real estate ventures is 25%. The operating agreements of the unconsolidated real estate ventures provide for the distribution of net cash flow to the unconsolidated real estate ventures' investors no less than monthly, generally in proportion to the investors’ respective ownership interests, subject to a promoted distribution to NSA upon the achievement of certain performance benchmarks by the non-NSA investor.

Supplemental Schedule 6

Same Store Performance Summary By MSA(1)

(dollars in thousands, except per square foot data) (unaudited)

Three Months Ended March 31, 2026 compared to Three Months Ended March 31, 2025

Total Revenue Property Operating Expenses Net Operating Income Net Operating Income Margin

MSA(1)

Stores 1Q 2026 1Q 2025 Change 1Q 2026 1Q 2025 Change 1Q 2026 1Q 2025 Change 1Q 2026 1Q 2025 Change

Portland-Vancouver-Hillsboro, OR-WA 51 $ 11,091 $ 10,721 3.5 % $ 2,928 $ 2,982 (1.8) % $ 8,163 $ 7,739 5.5 % 73.6 % 72.2 % 1.4 %

Riverside-San Bernardino-Ontario, CA 48 12,756 12,875 (0.9) % 3,027 3,033 (0.2) % 9,729 9,842 (1.1) % 76.3 % 76.4 % (0.1) %

Houston-Pasadena-The Woodlands, TX 36 8,020 8,062 (0.5) % 2,719 2,980 (8.8) % 5,301 5,082 4.3 % 66.1 % 63.0 % 3.1 %

Phoenix-Mesa-Chandler, AZ 26 5,440 5,695 (4.5) % 1,407 1,448 (2.8) % 4,033 4,247 (5.0) % 74.1 % 74.6 % (0.5) %

Dallas-Fort Worth-Arlington, TX 25 4,822 4,944 (2.5) % 1,843 1,816 1.5 % 2,979 3,128 (4.8) % 61.8 % 63.3 % (1.5) %

Atlanta-Sandy Springs-Roswell, GA 25 4,773 4,928 (3.1) % 1,505 1,583 (4.9) % 3,268 3,345 (2.3) % 68.5 % 67.9 % 0.6 %

Oklahoma City, OK 20 3,192 3,231 (1.2) % 955 961 (0.6) % 2,237 2,270 (1.5) % 70.1 % 70.3 % (0.2) %

Brownsville-Harlingen, TX 16 2,886 2,837 1.7 % 793 784 1.1 % 2,093 2,053 1.9 % 72.5 % 72.4 % 0.1 %

San Juan-Bayamón-Caguas, PR 15 9,873 9,616 2.7 % 1,905 1,915 (0.5) % 7,968 7,701 3.5 % 80.7 % 80.1 % 0.6 %

North Port-Bradenton-Sarasota, FL 15 4,014 4,264 (5.9) % 1,204 1,342 (10.3) % 2,810 2,922 (3.8) % 70.0 % 68.5 % 1.5 %

McAllen-Edinburg-Mission, TX 15 3,428 3,444 (0.5) % 827 845 (2.1) % 2,601 2,599 0.1 % 75.9 % 75.5 % 0.4 %

San Antonio-New Braunfels, TX 15 2,591 2,720 (4.7) % 980 1,095 (10.5) % 1,611 1,625 (0.9) % 62.2 % 59.7 % 2.5 %

Los Angeles-Long Beach-Anaheim, CA 14 5,861 5,685 3.1 % 1,467 1,451 1.1 % 4,394 4,234 3.8 % 75.0 % 74.5 % 0.5 %

Orlando-Kissimmee-Sanford, FL 13 3,097 3,143 (1.5) % 913 901 1.3 % 2,184 2,242 (2.6) % 70.5 % 71.3 % (0.8) %

Las Vegas-Henderson-North Las Vegas, NV 13 2,871 2,845 0.9 % 764 723 5.7 % 2,107 2,122 (0.7) % 73.4 % 74.6 % (1.2) %

Tulsa, OK 13 1,946 1,993 (2.4) % 599 601 (0.3) % 1,347 1,392 (3.2) % 69.2 % 69.8 % (0.6) %

Austin-Round Rock-San Marcos, TX 12 3,157 3,267 (3.4) % 1,109 1,138 (2.5) % 2,048 2,129 (3.8) % 64.9 % 65.2 % (0.3) %

Shreveport-Bossier City, LA 12 1,541 1,501 2.7 % 486 559 (13.1) % 1,055 942 12.0 % 68.5 % 62.8 % 5.7 %

Colorado Springs, CO 12 2,003 1,882 6.4 % 657 682 (3.7) % 1,346 1,200 12.2 % 67.2 % 63.8 % 3.4 %

Wichita, KS 12 1,861 1,761 5.7 % 660 750 (12.0) % 1,201 1,011 18.8 % 64.5 % 57.4 % 7.1 %

Amarillo, TX 10 1,726 1,623 6.3 % 483 505 (4.4) % 1,243 1,118 11.2 % 72.0 % 68.9 % 3.1 %

Bend, OR 10 2,071 1,972 5.0 % 460 527 (12.7) % 1,611 1,445 11.5 % 77.8 % 73.3 % 4.5 %

Other MSAs 307 65,201 64,843 0.6 % 20,705 21,722 (4.7) % 44,496 43,121 3.2 % 68.2 % 66.5 % 1.7 %

Total/Weighted Average 735 $ 164,221 $ 163,852 0.2 % $ 48,396 $ 50,343 (3.9) % $ 115,825 $ 113,509 2.0 % 70.5 % 69.3 % 1.2 %

2025 Same Store Pool(2)

728 $ 162,856 $ 162,498 0.2 % $ 47,893 $ 49,826 (3.9) % $ 114,963 $ 112,672 2.0 % 70.6 % 69.3 % 1.3 %

2024 Same Store Pool(3)

702 $ 157,176 $ 157,051 0.1 % $ 46,073 $ 47,967 (3.9) % $ 111,103 $ 109,084 1.9 % 70.7 % 69.5 % 1.2 %

(1) MSA (Metropolitan Statistical Area) as defined by the United States Census Bureau.

(2) Represents the subset of properties included in the 2026 same store pool that were in NSA's same store pool reported in 2025.

(3) Represents the subset of properties included in the 2026 same store pool that were in NSA's same store pool reported in 2024.

Supplemental Schedule 6 (continued)

Same Store Performance Summary By MSA(1)

(dollars in thousands, except per square foot data) (unaudited)

Three Months Ended March 31, 2026 compared to Three Months Ended March 31, 2025

Rentable Square Feet Occupancy at Period End Average Occupancy Average Annualized Rental Revenue per Occupied Square Foot

MSA(1)

Units 1Q 2026 1Q 2025 Change 1Q 2026 1Q 2025 Change 1Q 2026 1Q 2025 Change

Portland-Vancouver-Hillsboro, OR-WA 20,537 2,532,658 88.6 % 88.6 % — % 88.5 % 88.2 % 0.3 % $ 19.29 $ 18.60 3.7 %

Riverside-San Bernardino-Ontario, CA 26,898 3,636,803 85.0 % 84.3 % 0.7 % 84.8 % 85.0 % (0.2) % 16.02 16.06 (0.2) %

Houston-Pasadena-The Woodlands, TX 18,169 2,657,868 86.3 % 85.3 % 1.0 % 85.9 % 86.1 % (0.2) % 13.55 13.45 0.7 %

Phoenix-Mesa-Chandler, AZ 15,239 1,704,695 78.9 % 80.5 % (1.6) % 79.2 % 81.4 % (2.2) % 15.61 15.81 (1.3) %

Dallas-Fort Worth-Arlington, TX 12,566 1,638,412 80.4 % 79.5 % 0.9 % 80.2 % 79.6 % 0.6 % 14.17 14.50 (2.3) %

Atlanta-Sandy Springs-Roswell, GA 12,409 1,764,213 81.9 % 80.1 % 1.8 % 81.7 % 80.4 % 1.3 % 12.80 13.34 (4.0) %

Oklahoma City, OK 9,196 1,328,972 85.2 % 81.5 % 3.7 % 85.0 % 81.8 % 3.2 % 10.90 11.43 (4.6) %

Brownsville-Harlingen, TX 6,536 940,371 87.0 % 87.1 % (0.1) % 87.3 % 87.0 % 0.3 % 13.57 13.21 2.7 %

San Juan-Bayamón-Caguas, PR 12,856 1,379,381 88.2 % 89.6 % (1.4) % 88.6 % 90.0 % (1.4) % 31.40 30.10 4.3 %

North Port-Bradenton-Sarasota, FL 9,402 959,683 82.7 % 86.8 % (4.1) % 83.3 % 88.4 % (5.1) % 19.51 19.43 0.4 %

McAllen-Edinburg-Mission, TX 7,578 1,174,063 86.4 % 86.7 % (0.3) % 86.4 % 87.2 % (0.8) % 13.05 12.94 0.9 %

San Antonio-New Braunfels, TX 6,493 835,215 85.1 % 81.0 % 4.1 % 83.8 % 81.3 % 2.5 % 14.27 15.40 (7.3) %

Los Angeles-Long Beach-Anaheim, CA 9,752 1,064,494 84.6 % 83.4 % 1.2 % 84.2 % 84.2 % — % 25.50 24.69 3.3 %

Orlando-Kissimmee-Sanford, FL 7,800 925,936 85.2 % 82.5 % 2.7 % 84.6 % 83.9 % 0.7 % 15.19 15.24 (0.3) %

Las Vegas-Henderson-North Las Vegas, NV 7,080 880,970 86.1 % 89.0 % (2.9) % 86.0 % 87.9 % (1.9) % 14.64 14.13 3.6 %

Tulsa, OK 6,111 812,406 80.8 % 81.4 % (0.6) % 81.2 % 82.3 % (1.1) % 11.31 11.35 (0.4) %

Austin-Round Rock-San Marcos, TX 6,856 917,244 82.8 % 81.5 % 1.3 % 82.3 % 81.8 % 0.5 % 16.26 16.80 (3.2) %

Shreveport-Bossier City, LA 5,102 669,571 81.1 % 79.8 % 1.3 % 80.7 % 79.5 % 1.2 % 10.88 10.69 1.8 %

Colorado Springs, CO 4,825 615,732 87.1 % 84.7 % 2.4 % 87.4 % 83.7 % 3.7 % 14.38 13.99 2.8 %

Wichita, KS 4,198 586,931 87.1 % 85.0 % 2.1 % 87.7 % 84.6 % 3.1 % 13.70 13.20 3.8 %

Amarillo, TX 4,974 704,609 86.3 % 81.3 % 5.0 % 85.7 % 81.3 % 4.4 % 11.03 10.84 1.8 %

Bend, OR 3,937 570,674 88.2 % 87.4 % 0.8 % 88.6 % 85.9 % 2.7 % 15.96 15.56 2.6 %

Other MSAs 154,892 19,253,127 84.0 % 83.3 % 0.7 % 83.6 % 83.6 % — % 15.69 15.53 1.0 %

Total/Weighted Average 373,406 47,554,028 84.5 % 83.8 % 0.7 % 84.2 % 84.1 % 0.1 % $ 15.88 $ 15.78 0.6 %

2025 Same Store Pool(2)

369,685 47,047,276 84.5 % 83.9 % 0.6 % 84.3 % 84.2 % 0.1 % $ 15.91 $ 15.80 0.7 %

2024 Same Store Pool(3)

355,510 45,355,719 84.5 % 83.9 % 0.6 % 84.3 % 84.2 % 0.1 % $ 15.93 $ 15.84 0.6 %

(1) MSA (Metropolitan Statistical Area) as defined by the United States Census Bureau.

(2) Represents the subset of properties included in the 2026 same store pool that were in NSA's same store pool reported in 2025.

(3) Represents the subset of properties included in the 2026 same store pool that were in NSA's same store pool reported in 2024.

Supplemental Schedule 7

Same Store Operating Data (735 Stores) - Trailing Five Quarters

(dollars in thousands, except per square foot data) (unaudited)

1Q 2026 4Q 2025 3Q 2025 2Q 2025 1Q 2025

Revenue

Rental revenue $ 159,019 $ 159,106 $ 159,546 $ 158,028 $ 157,637

Other property-related revenue 5,202 5,500 5,971 6,186 6,215

Total revenue 164,221 164,606 165,517 164,214 163,852

Property operating expenses

Store payroll and related costs 10,303 11,011 11,797 11,812 11,572

Property tax expense 15,480 14,353 15,042 14,865 14,858

Utilities expense 4,671 4,274 5,868 4,713 5,230

Repairs & maintenance expense 3,387 3,360 3,613 4,284 4,565

Marketing expense 5,929 5,861 5,517 6,259 4,971

Insurance expense 2,286 2,289 2,290 2,285 2,459

Other property operating expenses 6,340 6,431 6,986 6,658 6,688

Total property operating expenses 48,396 47,579 51,113 50,876 50,343

Net operating income $ 115,825 $ 117,027 $ 114,404 $ 113,338 $ 113,509

Net operating income margin 70.5 % 71.1 % 69.1 % 69.0 % 69.3 %

Occupancy at period end 84.5 % 84.2 % 84.7 % 85.2 % 83.8 %

Average occupancy 84.2 % 84.2 % 85.2 % 84.4 % 84.1 %

Average annualized rental revenue (includes fees and net of any discounts and uncollectible customer amounts) per occupied square foot $ 15.88 $ 15.89 $ 15.76 $ 15.76 $ 15.78

Average annual contract storage rent per square foot

In-place customers $ 14.86 $ 14.86 $ 14.81 $ 14.82 $ 14.74

Move-ins $ 9.03 $ 9.26 $ 10.13 $ 10.36 $ 9.96

Move-outs $ 13.33 $ 13.34 $ 13.41 $ 13.51 $ 13.31

Move-Ins and Move-Outs (in rentable square feet)

Move-ins 5,432,512 5,006,190 5,583,760 5,838,210 4,460,522

Move-outs 5,373,455 5,351,164 5,916,278 5,290,746 5,052,317

Supplemental Schedule 8

Reconciliation of Same Store Data and Net Operating Income to Net Income

(dollars in thousands) (unaudited)

1Q 2026 4Q 2025 3Q 2025 2Q 2025 1Q 2025

Rental revenue

Same store portfolio

$ 159,019 $ 159,106 $ 159,546 $ 158,028 $ 157,637

Non-same store portfolio

9,195 10,163 10,361 11,810 11,838

Total rental revenue

168,214 169,269 169,907 169,838 169,475

Other property-related revenue

Same store portfolio

5,202 5,500 5,971 6,186 6,215

Non-same store portfolio

384 434 488 588 529

Total other property-related revenue

5,586 5,934 6,459 6,774 6,744

Property operating expenses

Same store portfolio

48,396 47,579 51,113 50,876 50,343

Non-same store portfolio

3,638 3,889 4,234 4,751 4,761

Total property operating expenses

52,034 51,468 55,347 55,627 55,104

Net operating income 121,766 123,735 121,019 120,985 121,115

Management fees and other revenue 11,601 11,828 12,336 12,230 12,135

General and administrative expenses (13,231) (13,721) (11,460) (12,804) (13,145)

Depreciation and amortization (46,140) (46,707) (46,885) (47,612) (48,116)

Other (3,098) (3,214) (4,101) (4,500) (4,476)

Interest expense (39,257) (40,152) (40,549) (41,269) (40,475)

Equity in earnings (losses) of unconsolidated real estate ventures 1,155 1,894 463 (3,945) (5,739)

Acquisition and integration costs (811) (797) (1,439) (2,040) (2,445)

Merger related costs (9,981) — — — —

Non-operating (expense) income (302) (391) 503 462 360

Gain on sale of self storage properties 6,458 5,297 — 9,571 1,425

Income tax expense (479) (991) (871) (120) (1,120)

Net Income $ 27,681 $ 36,781 $ 29,016 $ 30,958 $ 19,519

Supplemental Schedule 9

Selected Financial Information

(dollars in thousands, except per square foot data) (unaudited)

Three Months Ended March 31,

2026 2025

Average Annualized Rental Revenue Per Occupied Square Foot

Same store

$ 15.88 $ 15.78

Total consolidated portfolio

15.71 15.58

Average Occupancy

Same store

84.2 % 84.1 %

Total consolidated portfolio

83.7 % 83.4 %

Total Consolidated Portfolio Capital Expenditures

Recurring capital expenditures

$ 7,982 $ 5,272

Value enhancing capital expenditures 1,136 —

Acquisitions capital expenditures

429 199

Total consolidated portfolio capital expenditures $ 9,547 $ 5,471

Management Fees and Other Revenue Detail

Property management, call center and platform fees

$ 4,760 $ 4,668

Tenant insurance and tenant warranty protection related revenue 6,481 7,192

Other

360 275

Total management fees and other revenue on the Company's statements of operations $ 11,601 $ 12,135

Property Operating Expenses Detail

Store payroll and related costs $ 11,295 $ 12,914

Property tax expense 16,436 15,917

Utilities expense 5,046 5,724

Repairs & maintenance expense 3,609 5,003

Marketing expense 6,343 5,528

Insurance expense 2,483 2,689

Other property operating expenses 6,822 7,329

Property operating expenses on the Company's statements of operations

$ 52,034 $ 55,104

Supplemental Schedule 9 (continued)

Selected Financial Information

(dollars in thousands, except per square foot data) (unaudited)

Three Months Ended March 31,

2026 2025

General and Administrative Expenses Detail

Supervisory and administrative expenses $ 1,134 $ 1,441

Equity-based compensation expense 2,420 1,967

Other general and administrative expenses 9,677 9,737

General and administrative expenses on the Company's statements of operations

$ 13,231 $ 13,145

Glossary

This Earnings Release and Supplemental Financial Information includes certain financial and operating measures used by NSA management that are not calculated in accordance with accounting principles generally accepted in the United States, or GAAP. NSA's definitions and calculations of these non-GAAP financial and operating measures and other terms may differ from the definitions and methodologies used by other real estate companies and, accordingly, may not be comparable. These non-GAAP financial and operating measures should not be considered an alternative to GAAP net income or any other GAAP measurement of performance and should not be considered an alternative measure of liquidity.

AVERAGE ANNUALIZED RENTAL REVENUE PER OCCUPIED SQUARE FOOT: Average annualized rental revenue per occupied square foot is computed by dividing annualized rental revenue (including fees and net of any discounts and uncollectible customer amounts) by average occupied square feet.

AVERAGE OCCUPANCY: Average occupancy is calculated based on the average of the month-end occupancy immediately preceding the period presented and the month-end occupancies included in the respective period presented.

CAPITAL EXPENDITURES DEFINITIONS

ACQUISITIONS CAPITAL EXPENDITURES: Acquisitions capital expenditures represents the portion of capital expenditures capitalized during the current period that were identified and underwritten prior to a property's acquisition.

RECURRING CAPITAL EXPENDITURES: Recurring capital expenditures represents the portion of capital expenditures that are deemed to replace the consumed portion of acquired capital assets and extend their useful lives.

VALUE ENHANCING CAPITAL EXPENDITURES: Value enhancing capital expenditures represents the portion of capital expenditures that are made to enhance the revenue and value of an asset from its original purchase condition.

EBITDA: NSA defines EBITDA as net income (loss), as determined under GAAP, plus interest expense, loss on early extinguishment of debt, income taxes, depreciation and amortization expense and the Company's share of unconsolidated real estate venture depreciation and amortization. NSA defines ADJUSTED EBITDA as EBITDA plus acquisition costs, integration costs, executive severance costs, merger related costs, equity-based compensation expense, losses on sale of properties, impairment of long-lived assets and casualty-related expenses, losses and recoveries, minus gains on sale of properties and debt forgiveness, and after adjustments for unconsolidated partnerships and joint ventures, including the removal of the non-cash effect of applying hypothetical liquidation at book value (HLBV) for purposes of allocating GAAP net income (loss) for the 2024 Joint Venture. These further adjustments eliminate the impact of items that the Company does not consider indicative of its core operating performance. In evaluating EBITDA and Adjusted EBITDA, you should be aware that in the future the Company may incur expenses that are the same as or similar to some of the adjustments in this presentation. NSA's presentation of EBITDA and Adjusted EBITDA should not be construed as an inference that its future results will be unaffected by unusual or non-recurring items.

NSA presents EBITDA and Adjusted EBITDA because the Company believes they assist investors and analysts in comparing the Company's performance across reporting periods on a consistent basis by excluding items that the Company does not believe are indicative of its core operating performance. EBITDA and Adjusted EBITDA have limitations as an analytical tool. Some of these limitations are:

•EBITDA and Adjusted EBITDA do not reflect the Company's cash expenditures, or future requirements, for capital expenditures, contractual commitments or working capital needs;

•EBITDA and Adjusted EBITDA do not reflect the significant interest expense, or the cash requirements necessary to service interest or principal payments, on the Company's debts;

•although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and EBITDA and Adjusted EBITDA do not reflect any cash requirements for such replacements;

•Adjusted EBITDA excludes equity-based compensation expense, which is and will remain a key element of the Company's overall long-term incentive compensation package, although the Company excludes it as an expense when evaluating its ongoing operating performance for a particular period;

•EBITDA and Adjusted EBITDA do not reflect the impact of certain cash charges resulting from matters, such as merger related costs, the Company considers not to be indicative of its ongoing operations; and

•other companies in NSA's industry may calculate EBITDA and Adjusted EBITDA differently than NSA does, limiting their usefulness as comparative measures.

NSA compensates for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with the Company's analysis of net income (loss). EBITDA and Adjusted EBITDA should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues and net income (loss).

FUNDS FROM OPERATIONS: Funds from operations, or FFO, is a widely used performance measure for real estate companies and is provided here as a supplemental measure of the Company's operating performance. The December 2018 Nareit Funds From Operations White Paper - 2018 Restatement defines FFO as net income (as determined under GAAP), excluding: real estate depreciation and amortization, gains and losses from the sale of certain real estate assets, gains and losses from change in control, mark-to-market changes in value recognized on equity securities, impairment write-downs of certain real estate assets and impairment of investments in entities when it is directly attributable to decreases in the value of depreciable real estate held by the entity, and after adjusting equity in earnings (losses) to reflect the Company's share of FFO in unconsolidated real estate ventures. For purposes of calculating FFO attributable to common shareholders, OP unitholders, and LTIP unitholders, NSA excludes distributions declared on preferred shares and preferred units. NSA defines CORE FFO as FFO, as further adjusted to eliminate the impact of certain items that the Company does not consider indicative of its core operating performance. These further adjustments consist of acquisition costs, integration costs, executive severance costs, merger related costs, gains on debt forgiveness, gains (losses) on early extinguishment of debt, casualty-related expenses, losses and related recoveries, and after adjustments for unconsolidated partnerships and joint ventures.

Management uses FFO and Core FFO as key performance indicators in evaluating the operations of NSA's properties. Given the nature of NSA's business as a real estate owner and operator, the Company considers FFO and Core FFO as key supplemental measures of its operating performance that are not specifically defined by GAAP. NSA believes that FFO and Core FFO are useful to management and investors as a starting point in measuring the Company's operational performance because FFO and Core FFO exclude various items included in net income (loss) that do not relate to or are not indicative of the Company's operating performance such as gains (or losses) from sales of self storage properties and depreciation, which can make periodic and peer analyses of operating performance more difficult. NSA's computation of FFO and Core FFO may not be comparable to FFO reported by other REITs or real estate companies.

FFO and Core FFO should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues, operating income and net income (loss). FFO and Core FFO do not represent cash generated from operating activities determined in accordance with GAAP and are not a measure of liquidity or an indicator of NSA's ability to make cash distributions. NSA believes that to further understand the Company's performance, FFO and Core FFO should be compared with the Company's reported net income (loss) and considered in addition to cash flows computed in accordance with GAAP, as presented in the Company's consolidated financial statements.

HYPOTHETICAL LIQUIDATION AT BOOK VALUE METHOD OF UNCONSOLIDATED REAL ESTATE VENTURE: Subject to achieving certain performance benchmarks by the non-NSA investor, the distribution rights and priorities set forth in the 2024 Joint Venture agreement may differ from what is reflected by the underlying percentage ownership interest of the venture. Accordingly, NSA allocates GAAP income (loss) for its 2024 Joint Venture utilizing the hypothetical liquidation at book value ("HLBV") method, in which NSA allocates income or loss based on the change in each owners' claim on the net assets of the venture at period end assuming the liquidation of the underlying book value of the venture after adjusting for any distributions or contributions made during such period.

NET DEBT TO ANNUALIZED CURRENT QUARTER ADJUSTED EBITDA: NSA calculates net debt to Adjusted EBITDA as debt financing less cash and cash equivalents (both as reflected on the consolidated balance sheet), divided by annualized current quarter Adjusted EBITDA.

NET OPERATING INCOME: Net operating income, or NOI, represents rental revenue plus other property-related revenue less property operating expenses. NOI is not a measure of performance calculated in accordance with GAAP.

NSA believes NOI is useful to investors in evaluating the Company's operating performance because:

•NOI is one of the primary measures used by NSA's management to evaluate the economic productivity of the Company's properties, including the Company's ability to lease its properties, increase pricing and occupancy and control the Company's property operating expenses;

•NOI is widely used in the real estate industry and the self storage industry to measure the performance and value of real estate assets without regard to various items included in net income that do not relate to or are not indicative of operating performance, such as depreciation and amortization, which can vary depending upon accounting methods, the book value of assets, and the impact of NSA's capital structure; and

•NSA believes NOI helps the Company's investors to meaningfully compare the results of its operating performance from period to period by removing the impact of the Company's capital structure (primarily interest expense on the Company's outstanding indebtedness) and depreciation of the cost basis of NSA's assets from its operating results.

There are material limitations to using a non-GAAP measure such as NOI, including the difficulty associated with comparing results among more than one company and the inability to analyze certain significant items, including depreciation and interest expense, that directly affect the Company's net income (loss). NSA compensates for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with the Company's analysis of net income (loss). NOI should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues and net income (loss).

NON-SAME STORE PORTFOLIO: Non-same store portfolio comprises those properties that do not meet the Same Store portfolio property definition.

OPERATING PARTNERSHIP UNITS: Operating partnership units, or OP Units, are Class A common units of limited partner interest in the Company's operating partnership which are economically equivalent to NSA's common shares. NSA also owns certain of the Company's self storage properties through other consolidated subsidiaries of the Company's operating partnership, which the Company refers to as "DownREIT partnerships." The DownREIT partnerships issue certain units of limited partner or limited liability company interest that are intended to be economically equivalent to the Company's OP units, which the Company defines as DOWNREIT OPERATING PARTNERSHIP UNIT EQUIVALENTS, or DownREIT OP units.

PROs: Participating regional operators, or "PROs", were NSA's experienced regional self storage operators with local operational focus and expertise. Effective July 1, 2024, in connection with the internalization of the PRO structure, the Company purchased the PROs' management contracts. As of March 31, 2026, substantially all of the former PROs' operations have transitioned to the Company.

RENTABLE SQUARE FEET: Rentable square feet includes all enclosed self storage units but excludes commercial, residential, and covered parking space.

SAME STORE PORTFOLIO: NSA's same store portfolio is defined as those properties owned and operated on a stabilized basis since the first day of the earliest year presented. The Company considers a property to be stabilized once it has achieved an occupancy rate that is representative of similar properties in the applicable market. NSA excludes any properties sold, expected to be sold or subject to significant changes such as expansions or casualty events which cause the portfolio's year-over-year operating results to no longer be comparable.

Equity Research Coverage

Barclays BMO Capital Markets BNP Paribas Exane

Brendan Lynch Juan Sanabria John Paul Flangos

212.526.9428 312.845.4074 646.342.5660

BofA Global Research Citi Investment Research Deutsche Bank

Samir Khanal Eric Wolfe Omotayo Okusanya

646.855.1497 212.816.2640 212.250.9284

Evercore ISI Green Street Jefferies

Michael Griffin Spenser Glimcher Jonathan Petersen

212.752.0886 949.640.8780 212.284.1705

KeyBanc Capital Markets Mizuho Securities Morgan Stanley

Todd Thomas Ravi Vaidya Ronald Kamdem

917.368.2286 212.282.4347 212.296.8319

RW Baird Truist Securities UBS

Wes Golladay Michael Lewis Michael Goldsmith

216.737.7510 212.319.5659 212.713.2951

Wells Fargo Wolfe Research

Eric Luebchow Andrew Rosivach

312.630.2386 646.582.9250

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