Steven G. Osgood - 15 May 2026 Form 4 Insider Report for National Storage Affiliates Trust (NSA)

Reporting relationship: Director
Issuer ticker: NSA
Reported as of: 15 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 May 2026, 16:02:35 UTC
Prior SEC filing: 06 Jun 2025
Next SEC filing: 05 Jun 2026
Source filing: View source filing
Reporting owner signature: Steven G. Osgood, by Zoya F. Afridi, his Attorney-in-fact

Key filing fact

Steven G. Osgood filed Form 4 for National Storage Affiliates Trust (NSA) on 19 May 2026.

Key facts

This page summarizes Steven G. Osgood's Form 4 filing for National Storage Affiliates Trust (NSA).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 19 May 2026, 16:02.

Change

Previous filing in this sequence was filed on 06 Jun 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001306273 Primary reporting owner

OSGOOD STEVEN G

Relationship: Director
Address: C/O NATIONAL STORAGE AFFILIATES TRUST, 8400 EAST PRENTICE AVENUE, 9TH FLOOR, GREENWOOD VILLAGE
Signature: Steven G. Osgood, by Zoya F. Afridi, his Attorney-in-fact
Signature date: 19 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

NSA transaction

Common shares of beneficial interest, $0.01 par value

Award

Transaction value
Shares: +5,232
Change %
Price: $42.53^*
Shares after: 5,232
Date: 15 May 2026
Ownership: See footnote
Footnotes: F1, F2, F3, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

NSA transaction Derivative

LTIP Units

Conversion of derivative security

Transaction value
Shares: -11,451
Change %: -100%
Price
Shares after: 0
Date: 16 May 2026
Ownership: See footnote
Underlying class: Class A OP Units
Underlying amount: 11,451
Exercise price
Footnotes: F4, F5, F6, F7, F8, F9

NSA transaction Derivative

Class A OP Units

Conversion of derivative security

Transaction value
Shares: +11,451
Change %: +8.7%
Price
Shares after: 142,487
Date: 16 May 2026
Ownership: See footnote
Underlying class: Common shares of beneficial interest, $0.01 par value
Underlying amount: 11,451
Exercise price
Footnotes: F4, F5, F6, F7, F8, F9

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 9 footnotes

Footnote F1

Consists of 5,232 restricted common shares of beneficial interest, $0.01 par value of the Issuer ("Restricted Shares"). The Restricted Shares were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest scheduled to vest the earlier of: (i) May 15, 2027, (ii) the calendar day immediately preceding the next annual meeting of shareholders or (iii) immediately prior to the Company Merger Effective Time (as such term is defined in that certain Agreement of Plan and Merger, dated as of March 16, 2026, by and among the Issuer, NSA OP, LP (the "Partnership"), Public Storage, Public Storage OP, L.P., Pelican Merger Sub I, LLC and Pelican Merger Sub II, LLC, as the same may be amended).

Footnote F2

The closing price of the Issuer's common shares of beneficial interest, $0.01 par value ("Shares") on May 14, 2026.

Footnote F3

The Reporting Person's total direct and indirect beneficial ownership following the reported transaction in this class of securities is 5,232 Shares. The 5,232 Shares does not include derivative securities of the Reporting Person that have been previously reported on the Reporting Person's Forms 3 and Forms 4.

Footnote F4

Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. 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

Footnote F5

Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

Footnote F6

Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

Footnote F7

Consists of 11,451 LTIP Units held by the Reporting Person which were converted into 11,451 Class A OP Units as described in footnote 5 above. The Reporting Person previously reported the 11,451 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, rows 1 and 2 of Table II of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 11,451 LTIP Units into 11,451 Class A OP Units.

Footnote F8

N/A

Footnote F9

The Reporting Person's total direct beneficial ownership following the reported transactions above is 142,487 Class A OP Units (which includes those Class A OP Units previously reported and the Class A OP Units reported herein) and 0 LTIP Units. The 142,487 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.