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[6-K] Quantum Biopharma Ltd. Current Report (Foreign Issuer)

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6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

Commission File Number: 001-39152

QUANTUM BIOPHARMA LTD.

(Registrant)

1 Adelaide Street East, Suite 801

Toronto, Ontario M5C 2V9

(Address of Principal Executive Offices)

Indicate by check mark whether the Registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  ☒            Form 40-F  ☐

Indicate by check mark if the Registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the Registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐


DOCUMENTS INCORPORATED BY REFERENCE

Exhibits 99.4 and 99.9 of this Form 6-K are hereby incorporated by reference into the Registrant's Registration Statement on Form F-3 (File No. 333-276264) and shall be deemed to be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

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, thereunto duly authorized.

  QUANTUM BIOPHARMA LTD.
  (Registrant)
     
Date October 28, 2025 By /s/ Donal Carroll
    Donal Carroll
    Chief Financial Officer


EXHIBIT INDEX

Exhibit   Description of Exhibit
   
99.1   Notice of Meeting and the Record Date dated June 7, 2024
     
99.2   Report of Voting Results dated July 23, 2024
     
99.3   Notice of Meeting and the Record Date dated August 5, 2025
     
99.4   Management Information Circular dated August 14, 2025
     
99.5   Voting Instruction Form
     
99.6   Request for Financial Statements
     
99.7   Notice of Availability of Proxy Materials
     
99.8   Form of Proxy
     
99.9   Notice of Meeting dated August 14, 2025
     
99.10   Report of Voting Results dated September 29, 2025


Quantum BioPharma Ltd

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