Quantum Biopharma adds April release to shelf

Quantum Biopharma amends a prior Form 6-K so that an earlier press release becomes part of its existing Form F-3 shelf registration statement.

Rhea-AI Filing Summary

Quantum Biopharma Ltd. (QNTM) filed an amendment to its prior Form 6-K from April 2, 2026. The amendment’s sole purpose is to formally incorporate Exhibit 99.1, a press release dated April 2, 2026, into Quantum Biopharma’s existing Form F-3 registration statement (File No. 333-276264).

No other changes are made to the earlier Form 6-K; the press release is now deemed part of the Form F-3 from the date the original report was furnished, unless superseded by later filings.

Key Terms

Form 6-K, Form F-3, incorporated by reference, foreign private issuer

4 terms

Form 6-K regulatory

"Amendment No. 1 to the report on Form 6-K originally furnished"

A Form 6-K is a report that companies listed in certain countries file to provide important updates, such as financial results, corporate changes, or other significant information, to regulators and investors. It functions like an official company update or news release, helping investors stay informed about developments that could affect their investment decisions.

Form F-3 regulatory

"Registration Statement on Form F-3 (File No. 333-276264)"

Form F-3 is a U.S. securities filing that lets eligible foreign companies pre-register and then quickly sell shares or other securities to raise money, because they already meet ongoing reporting and size tests. For investors it signals that the company is up-to-date with regulatory disclosure and has an efficient way to issue new securities — similar to a pre-approved credit line — which can mean faster capital raises but also potential dilution of existing holdings.

incorporated by reference regulatory

"is hereby incorporated by reference into the Registrant’s Registration Statement"

foreign private issuer regulatory

"REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Quantum Biopharma Ltd. (QNTM) change in this Form 6-K/A?

The amendment only incorporates Exhibit 99.1, a press release dated April 2, 2026, into Quantum Biopharma’s Form F-3 registration statement (File No. 333-276264). The company states there are no other changes to the original April 2, 2026 Form 6-K.

How does this Form 6-K/A affect Quantum Biopharma’s Form F-3 shelf (QNTM)?

Exhibit 99.1 is now incorporated by reference into the Form F-3 (File No. 333-276264) and is deemed part of that registration statement from the date the original Form 6-K was furnished, unless later filings supersede it.

Does the Quantum Biopharma (QNTM) amendment add new financial or operating data?

No. The amendment is described as being furnished solely to incorporate Exhibit 99.1 into the Form F-3 registration statement. It explicitly states that, except for this change, there are no other changes to the initial Form 6-K.

What is Exhibit 99.1 referenced in Quantum Biopharma’s Form 6-K/A?

Exhibit 99.1 is a press release dated April 2, 2026, which had been filed with the original Form 6-K on that date. This amendment makes that press release part of the Form F-3 registration statement via incorporation by reference.

Who signed this Quantum Biopharma Ltd. (QNTM) Form 6-K/A and in what capacity?

The amendment is signed on behalf of Quantum Biopharma Ltd. by Donal Carroll, who is identified as the company’s Chief Financial Officer. The signature is dated September 8, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 09/08/2026 - 12:40 PM EDT Accepted by SEC EDGAR 09/08/2026 - 12:39 PM EDT Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K/A

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

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  ☐

EXPLANATORY NOTE

This Amendment No. 1 (this “Amendment No. 1”) to the report on Form 6-K originally furnished with the U.S. Securities and Exchange Commission on April 2, 2026, Accession Number 0001171843-26-002207 (the “Initial Report”), is being furnished solely to incorporate Exhibit 99.1 filed as part of the Initial Report into the Registrant’s Registration Statement on Form F-3 (File No. 333-276264). Except as set forth herein, there are no other changes to the Initial Report.

1

DOCUMENTS INCORPORATED BY REFERENCE

Exhibit 99.1 included with this Amendment No. 1 is 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 the Initial Report was furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

2

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: September 8, 2026	By	/s/ Donal Carroll
		Donal Carroll
		Chief Financial Officer

3

EXHIBIT INDEX

Exhibit		Description of Exhibit
99.1		Press Release dated April 2, 2026 (incorporated by reference to Exhibit 99.1 to the Form 6-K furnished on April 2, 2026, Accession No. 0001171843-26-002207)

4