Sec Form 4 Filing - Reppas Tiah Norton @ Sphere 3D Corp. - 2026-03-11

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 Reppas Tiah Norton 2. Issuer Name and Ticker or Trading Symbol Sphere 3D Corp. [ ANY] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Accounting Officer (Last) (First) (Middle) FIRST EXECUTIVE SUITES, 100 E SAN MARCOS, SUITE 400 3. Date of Earliest Transaction (MM/DD/YY) 03/11/2026 (Street) SAN MARCOS, CA92069 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 Common Stock 03/11/2026 M 16,250 A 18,634 D Common Stock ( 2 ) 03/12/2026 S 6,250 D $ 1.61 12,384 ( 3 ) 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 Restricted Stock Unit (RSU) ( 1 ) 03/11/2026 M 16,250 03/01/2026 03/01/2026 Common Stock 16,250 ( 1 ) 90,000 ( 4 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Reppas Tiah Norton FIRST EXECUTIVE SUITES, 100 E SAN MARCOS SUITE 400 SAN MARCOS, CA92069 Chief Accounting Officer Signatures By: Denise Garrett For: Tiah Reppas 03/13/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each RSU represents a contingent right to receive one share of Sphere 3D Corp. common stock. ( 2 )This transaction represents the sale of shares by the reporting person to satisfy the issuer's tax withholding obligations in connection with the release of vested RSUs on March 11, 2026. ( 3 )The common share balance has been adjusted to reflect the issuer's 1 for 10 reverse stock split effective February 9, 2026. ( 4 )The RSUs reported under Column 9 include three awards. The underlying outstanding shares and vesting schedules are as follows: (i) 5,000 shares outstanding of which 1,250 shares vest quarterly from June 1, 2026 until March 1, 2027; (ii) 35,000 outstanding shares of which 5,000 shares vest quarterly from June 1, 2026 until December 1, 2027; and (iii) 50,000 outstanding shares which vest in full on March 4, 2027.

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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