STOCK TITAN

[Form 4] National Storage Affiliates Trust Insider Trading Activity

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

National Storage Affiliates Trust Chief Strategy Officer William S. Cowan Jr. reported a non-cash conversion of equity-linked awards. On May 21, 2026, 17,606 LTIP Units were converted into 17,606 Class A OP Units under the partnership agreement, and those Class A OP Units are in turn convertible into common shares on a one-for-one basis, at the issuer’s option.

Following these transactions, Cowan directly holds 197,016 Class A OP Units and 151,394 unvested LTIP Units, with no vested LTIP Units remaining. The filing is described as voluntary and is intended to give notice of the LTIP-to-Class A OP Unit conversion rather than any open-market buying or selling.

Positive

  • None.

Negative

  • None.

Insights

Routine equity award conversion with no open-market trading.

The filing shows William S. Cowan Jr. converting 17,606 LTIP Units into an equal number of Class A OP Units, and reflecting the related derivative position into common shares. No purchase or sale price is involved; the transactions are classified as derivative conversions.

This is primarily an administrative update to align how previously reported LTIP Units and OP Units are reflected. Cowan’s position remains substantial at 197,016 Class A OP Units and 151,394 unvested LTIP Units. There is no indication of a Rule 10b5-1 trading plan or market sales in this excerpt.

The filing itself states it is being made on a voluntary basis to provide notice of the conversion, which supports interpreting this as routine equity compensation housekeeping rather than a signal about Cowan’s view of National Storage Affiliates Trust.

Insider Cowan William S. Jr.
Role Chief Strategy Officer
Type Security Shares Price Value
Conversion LTIP Units 17,606 $0.00 --
Conversion Class A OP Units 17,606 $0.00 --
Holdings After Transaction: LTIP Units — 151,394 shares (Direct, null); Class A OP Units — 197,016 shares (Direct, null)
Footnotes (1)
  1. Pursuant to the agreement of limited partnership (the "Partnership Agreement") of NSA OP, LP (the "Partnership"), the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A common units of limited partner interest ("Class A OP Units") for cash in an amount equal to the market value of an equivalent number of the common shares of beneficial interest ("Shares") of National Storage Affiliates Trust (the "Issuer"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments. Pursuant to the Partnership Agreement, upon the achievement of certain conditions, a holder of long-term incentive plan units ("LTIP Units") of the Partnership is entitled to convert such LTIP Units into Class A OP Units of the Partnership on a one-for-one basis. Consists of 17,606 LTIP Units held by the Reporting Person which were converted into 17,606 Class A OP Units. N/A The Reporting Person's total direct and indirect beneficial ownership of Class A OP Units following the reported transactions above is 197,016 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified therein). This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein. Following the reported transactions, the Reporting Person has total direct beneficial ownership in 0 vested LTIP Units and 151,394 unvested LTIP Units. The Reporting Person previously reported the 17,606 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, this Form 4 is being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 17,606 LTIP Units into 17,606 Class A OP Units.
LTIP Units converted 17,606 units Converted into 17,606 Class A OP Units on May 21, 2026
Class A OP Units after transaction 197,016 units Total direct and indirect beneficial ownership following reported transactions
Unvested LTIP Units after transaction 151,394 units Total direct beneficial ownership in unvested LTIP Units after conversion
Vested LTIP Units after transaction 0 units Vested LTIP Units remaining after converting 17,606 LTIP Units
Derivative exercises 35,212 units Total derivative conversion shares across two transactions in summary data
Class A OP Units financial
"the Reporting Person's Class A common units of limited partner interest ("Class A OP Units") for cash"
LTIP Units financial
"a holder of long-term incentive plan units ("LTIP Units") of the Partnership is entitled to convert"
LTIP units are awards given to executives and employees as part of a long-term incentive plan; they act like deferred bonuses that convert into company shares or cash only if the business meets set performance or time requirements. Investors care because LTIP units tie management pay to future results, can increase the number of outstanding shares (dilution) when they vest, and create ongoing compensation expense that can affect earnings and shareholder value.
Partnership Agreement financial
"Pursuant to the agreement of limited partnership (the "Partnership Agreement") of NSA OP, LP"
A partnership agreement is a written contract that lays out how two or more parties will work together, splitting responsibilities, profits, losses and decision-making. Think of it as a detailed roadmap or house rulebook for a joint project; it matters to investors because the terms determine how much revenue and risk a company will take on, how quickly it can act, and whether the partnership could dilute control or boost growth potential.
beneficial ownership financial
"This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Cowan William S. Jr.

(Last)(First)(Middle)
C/O NATIONAL STORAGE AFFILIATES TRUST
8400 EAST PRENTICE AVENUE, 9TH FLOOR

(Street)
GREENWOOD VILLAGE COLORADO 80111

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
National Storage Affiliates Trust [ NSA ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Strategy Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
LTIP Units(1)(2)(1)(2)05/21/2026C17,606(2)(3) (1)(3) (4)Class A OP Units17,606(3)151,394(5)(6)(7)D
Class A OP Units(1)(1)05/21/2026C17,606(2)(3) (1) (4)Common shares of beneficial interest, $0.01 par value(1)17,606(3)197,016(5)(6)(7)D
Explanation of Responses:
1. Pursuant to the agreement of limited partnership (the "Partnership Agreement") of NSA OP, LP (the "Partnership"), the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A common units of limited partner interest ("Class A OP Units") for cash in an amount equal to the market value of an equivalent number of the common shares of beneficial interest ("Shares") of National Storage Affiliates Trust (the "Issuer"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.
2. Pursuant to the Partnership Agreement, upon the achievement of certain conditions, a holder of long-term incentive plan units ("LTIP Units") of the Partnership is entitled to convert such LTIP Units into Class A OP Units of the Partnership on a one-for-one basis.
3. Consists of 17,606 LTIP Units held by the Reporting Person which were converted into 17,606 Class A OP Units.
4. N/A
5. The Reporting Person's total direct and indirect beneficial ownership of Class A OP Units following the reported transactions above is 197,016 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified therein).
6. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.
7. Following the reported transactions, the Reporting Person has total direct beneficial ownership in 0 vested LTIP Units and 151,394 unvested LTIP Units. The Reporting Person previously reported the 17,606 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, this Form 4 is being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 17,606 LTIP Units into 17,606 Class A OP Units.
Remarks:
William S. Cowan, Jr., by Zoya Afridi, his Attorney-in-fact05/21/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did NSA Chief Strategy Officer William S. Cowan Jr. report?

He reported a conversion of equity-linked awards, not a market trade. On May 21, 2026, 17,606 LTIP Units were converted into 17,606 Class A OP Units, which are themselves exchangeable into common shares on a one-for-one basis under the partnership agreement.

Did William S. Cowan Jr. buy or sell National Storage Affiliates Trust (NSA) common shares?

The filing does not show any open-market buying or selling of NSA common shares. It records derivative conversions: LTIP Units into Class A OP Units and OP Units into common-share equivalents, all at a stated price of $0.00 per unit with no cash transaction disclosed.

How many Class A OP Units does the NSA executive hold after this Form 4?

After the reported conversions, William S. Cowan Jr. beneficially holds 197,016 Class A OP Units. This figure includes the newly converted 17,606 Class A OP Units along with previously reported holdings and related securities exchangeable into Class A OP Units under earlier disclosures.

What happened to William S. Cowan Jr.’s LTIP Units in this NSA Form 4?

Following the reported transactions, he holds 0 vested LTIP Units and 151,394 unvested LTIP Units. The 17,606 LTIP Units highlighted in this filing were converted into 17,606 Class A OP Units pursuant to the partnership agreement’s terms governing LTIP Unit conversions.

Why does the NSA Form 4 describe the filing as voluntary?

A footnote explains this Form 4 is filed on a voluntary basis to provide notice of converting 17,606 LTIP Units into 17,606 Class A OP Units. Those LTIP Units had previously been reported on an as-converted basis, so the update mainly clarifies the form of Cowan’s existing equity interest.

Can William S. Cowan Jr. exchange his Class A OP Units for NSA common shares?

Yes. Under the NSA OP, LP partnership agreement, he can cause the partnership to redeem Class A OP Units for cash equal to the market value of equivalent common shares, or, at the issuer’s option, receive common shares on a one-for-one basis, subject to adjustments.