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333-276264) and shall be deemed to be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.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 |