Sec Form 4 Filing - Willow Grove Holdings LP @ U-Haul Holding Co /NV/ - 2025-09-18

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED 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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Willow Grove Holdings LP 2. Issuer Name and Ticker or Trading Symbol U-Haul Holding Co /NV/ [ UHALB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 207 E. CLARENDON AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 09/18/2025 (Street) PHOENIX, AZ85012 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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) Code V Amount (A) or (D) Price Series N Common Stock 09/18/2025 P 229,515 A 8,150,658 I ( 2 ) Blackwater Investments, Inc. Series N Common Stock 67,253,456 D Common Stock 24,900 I ( 2 ) SAC Holding Corporation Common Stock 1,324,000 I ( 2 ) Clarendon Strategies, LLC Common Stock 880,127 I ( 2 ) Blackwater Investments, Inc. Common Stock 7,562,884 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Willow Grove Holdings LP 207 E. CLARENDON AVENUE PHOENIX, AZ85012 X Foster Road LLC 207 E. CLARENDON AVENUE PHOENIX, AZ85012 X Clarendon Strategies, LLC 207 E. CLARENDON AVENUE PHOENIX, AZ85012 X Blackwater Investments, Inc. 207 E. CLARENDON AVENUE PHOENIX, AZ85012 X SAC HOLDING CORP 715 SOUTH COUNTRY CLUB DRIVE MESA, AZ85210 X Signatures /s/ Stuart M. Shoen, Willow Grove Holdings LP, 09/22/2025 Signature of Reporting Person Date /s/ Stuart M. Shoen for Foster Road LLC 09/22/2025 Signature of Reporting Person Date /s/ Stuart M. Shoen, Clarendon Strategies, LLC 09/22/2025 Signature of Reporting Person Date /s/ Mark V. Shoen, Blackwater Investments, Inc, 09/22/2025 Signature of Reporting Person Date /s/ Eric Voita, SAC Holding Corporation 09/22/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 4 is being filed in connection with a sale by the MVS-029 Trust of 229,515 shares of Series N Common Stock to Blackwater Investments, Inc. ("Blackwater") in exchange for all of the outstanding equity interests in Holdfast Marine, LLC, which were valued for purposes of this transaction at approximately $11.8 million. Blackwater is a wholly owned subsidiary of the Reporting Person. Accordingly, the Reporting Person may be deemed to have indirect beneficial ownership of the Series N Common Stock held by Blackwater. The Reporting Person disclaims beneficial ownership of shares held directly and indirectly by Blackwater and its subsidiaries, including Clarendon Strategies, LLC ("Clarendon") and SAC Holding Corporation ("SAC"), except to the extent of its pecuniary interest therein. ( 2 )Willow Grove is owned and controlled by Foster Road LLC and various trusts associated with Edward J. Shoen and Mark V. Shoen. Foster Road LLC is the general partner of Willow Grove and is managed by Mark V. Shoen and Stuart Shoen. Blackwater is a wholly owned subsidiary of Willow Grove. Clarendon and SAC are wholly owned subsidiaries of Blackwater.

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).

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