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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of: May 2026

Commission File Number: 001-39152

Quantum Biopharma Ltd.

(Translation of registrant’s name into English)

1 Adelaide Street East, Suite 801

Toronto, Ontario M5C 2V9

(Address of principal executive office)

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 ☐

INCORPORATION BY REFERENCE

This Report on Form 6-K and the exhibits attached hereto (Exhibit 99.1 and 99.2) are incorporated by reference into the Registrant’s Registration Statement on Form F-3 (SEC File No. 333-276264), including any prospectuses forming a part of such Registration Statement and to be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

CONTENTS

This Report of Foreign Private Issuer on Form 6-K (this “Form 6-K”) consists of Quantum BioPharma Ltd.’s (i) Unaudited Condensed Consolidated Financial Statements as of, and for the three months ended March 31, 2026 and 2025, which are attached hereto as Exhibit 99.1; and (ii) Management’s Discussion and Analysis of Financial Condition and Results of Operations for the three months ended March 31, 2026 and 2025, which is attached hereto as Exhibit 99.2.

EXHIBIT INDEX

Exhibit		Description

99.1		Condensed consolidated interim financial statements for the three months ended March 31, 2026 and 2025

99.2		Management’s Discussion and Analysis of Financial Condition and Results of Operation for the three months ended March 31, 2026 and 2025

99.3		CEO Certificate

99.4		CFO Certificate

101.INS		XBRL Instance Document

101.SCH		Inline XBRL Taxonomy Extension Schema Document

101.SCH		Inline XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF		Inline XBRL Taxonomy Extension Definition Linkbase Document

101.LAB		Inline XBRL Taxonomy Extension Label Linkbase Document

101.PRE		Inline XBRL Taxonomy Extension Presentation Linkbase Document

104		Cover Page Interactive Data File( formatted as Inline XBRL and contained in Exhibit 101)

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: May 6, 2026	By:	/s/ Donal Carroll
		Donal Carroll, Chief Financial Officer

SEC Form 6-K filed by Quantum Biopharma Ltd.