6-K - CRDL - Equibles

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 October 2025

Commission File Number: 001-40712

Cardiol Therapeutics Inc. (Translation of registrant's name into English)

602-2265 Upper Middle Road East, Oakville, Ontario, Canada L6H 0G5 (Address of principal executive offices)

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

[ ] Form 20-F [X] Form 40-F

SUBMITTED HEREWITH

Exhibits

Exhibit	Description
99.1	Material Change Report dated October 27, 2025

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.

	CARDIOL THERAPEUTICS INC.
	(Registrant)
Date: October 27, 2025	By:	/s/ Chris Waddick
		Chris Waddick
	Title:	Chief Financial Officer

Cardiol Therapeutics Inc.: Exhibit 99.1 - Filed by newsfilecorp.com

Form 51-102F3

Material Change Report

ITEM 1 NAME AND ADDRESS OF ISSUER

Cardiol Therapeutics Inc. ("Cardiol" or **** the "Company")

2265 Upper Middle Road East, Suite 602

Oakville, Ontario, Canada

L6H 0G5

ITEM 2 DATE OF MATERIAL CHANGE

October 17, 2025

ITEM 3 NEWS RELEASE

Attached as Schedule "A" are copies of the news releases relating to the material change (the "News Releases") which were disseminated on October 17, 2025 and October 21, 2025 through Newsfile and filed on the System of Electronic Document Analysis and Retrieval at www.sedarplus.ca.

ITEM 4 SUMMARY OF MATERIAL CHANGE

Cardiol, a clinical-stage life sciences company focused on the research and clinical development of anti-inflammatory and anti-fibrotic therapies for the treatment of heart disease, announced that it completed its private placement offering (the "Offering") of units (the "Units") of the Company for proceeds of US$11.4 million.

ITEM 5.1 FULL DESCRIPTION OF MATERIAL CHANGE

On October 21, 2025, the Company announced that it had closed the Offering of 11.4 million Units at price of US$1.00 per Unit for aggregate net proceeds of US$11.4 million. Each Unit issued under the Offering consists of one Class A common share of the Company (a "Common Share") and one-half of one Common Share purchase warrant. Each whole warrant (a "Warrant") entitles the holder to acquire one additional Common Share at an exercise price of US$1.35 for a period of 24 months from the date of issuance. Each Warrant includes an acceleration provision, allowing the Company to advance its expiry to the 30^th^ day following the issuance of a news release if the daily volume-weighted average trading price of the Common Shares exceeds US$2.00 for five consecutive trading days.

The Company intends to use the proceeds of the Offering to provide cash resources that are anticipated to support operations into the third quarter of 2027.

Disclosure Required by Multilateral Instrument 61- 101

Certain insiders of the Company participated in the Offering. Such participation is considered to be a "related-party transaction" within the meaning of Multilateral Instrument 61-101 - Protection of Minority Security Holders in Special Transactions ("MI 61-101"). The Company is relying on the exemptions from the formal valuation and minority shareholder approval requirements of MI 61-101 contained in sections 5.5(a) and 5.7(1)(a) of MI 61-101 in respect of related-party participation in the Offering as the fair market value (as determined under MI 61-101) of the subject matter of, and the fair market value of the consideration for, the transaction, insofar as it involved interested parties, did not exceed 25% of the Company's market capitalization (as determined under MI 61-101). Each participating director abstained from the approval of the pricing committee and the approval of the board of directors of the Company with respect to the approval of the Offering.

Material Change Report
P. 1 of 3

The Company did not file a material change report more than 21 days before the expected closing date of the Offering as the details of the Offering and the insider participation thereof were not settled until shortly prior to the closing of the Offering, and the Company wished to close the Offering on an expedited basis for sound business reasons.

There is no undisclosed material information by the Company and all non-participating directors have approved the Offering described in the News Releases.

ITEM 5.2 DISCLOSURE FOR RESTRUCTURING TRANSACTIONS.

Not applicable.

ITEM 6 RELIANCE ON SUBSECTION 7.1(2) OR (3) OF NATIONAL INSTRUMENT 51-102

Not applicable.

ITEM 7 OMITTED INFORMATION

No information has been omitted on the basis that it is confidential information.

ITEM 8 EXECUTIVE OFFICER

Chris Waddick

Chief Financial Officer

(289) 910-0850

ITEM 9 DATE OF REPORT

October 27, 2025

Material Change Report
P. 2 of 3

SCHEDULE "A"

See attached News Releases.

Material Change Report
P. 3 of 3

Cardiol Therapeutics Secures US$11 Million Financing and Extends Cash Runway into Q3 2027

MAVERIC Phase III pivotal trial of orphan drug candidate CardiolRx™ in recurrent pericarditis is fully funded through to a planned New Drug Application submission with the FDA.
New data from the ARCHER trial, highlighting the magnitude of reduction in left ventricular (LV) mass and the read through to heart failure, to be presented at a cardiology conference in November 2025.
Next-generation therapy CRD-38 for heart failure funded through to clinical development, with partnership discussions advancing with leading pharmaceutical companies.

Toronto, ON - October 17, 2025 - Cardiol Therapeutics Inc. (NASDAQ: CRDL) (TSX: CRDL) ("Cardiol" or the "Company"), a clinical-stage life sciences company advancing late-stage, anti-inflammatory and anti-fibrotic therapies for heart disease, today announced the successful completion of a private placement offering (the "Offering") of units ("Units") for net proceeds of US$11 million. The initial closing of US$10 million has been completed, with the remaining US$1 million to close on Monday, October 20, 2025.

"As recruitment in our pivotal Phase III MAVERIC trial gains momentum, with several prominent centers across the U.S. now enrolling patients, we are pleased to have secured a direct investment of US$11 million to strengthen our balance sheet and accelerate the development of our novel heart failure drug, CRD-38, based on the recently reported findings from our ARCHER trial," said David Elsley, President and CEO of Cardiol Therapeutics. "Topline results from our ARCHER trial demonstrated a significant reduction in LV mass-marking the first evidence of structural and remodeling improvement in patients with myocarditis. This landmark finding represents our second clinical validation in inflammatory heart disease and establishes a key translational link to data published earlier this year in the Journal of the American College of Cardiology, which demonstrated the beneficial effects of the active pharmaceutical ingredient or API in CardiolRx on cardiac structure, inflammation, and fibrosis in a model of heart failure. The ARCHER findings support pursuing an additional Orphan Drug Designation for CardiolRx in myocarditis and advancing the development of our next-generation CRD-38 formulation, which delivers the same API via subcutaneous administration, to target the broader heart failure market. Notably, blockbuster drugs that reduce LV mass have been shown to lower heart failure-related death and hospitalization, underscoring the clinical potential of Cardiol's differentiated anti-inflammatory mechanism to address a large unmet need in heart failure, where five-year mortality rates still exceed 50%."

Under the Offering, the Company sold a total of 11 million Units at a price of US$1.00 per Unit. Each Unit consists of one Class A common share of the Company (a "Common Share") and one-half of one Common Share purchase warrant. Each whole warrant entitles the holder to acquire one additional Common Share at an exercise price of US$1.35 for a period of 24 months from the date of issuance. The warrants include an acceleration provision, allowing the Company to advance their expiry to the 30^th^ day following the issuance of a news release if the daily volume-weighted average trading price of the Common Shares exceeds US$2.00 for five consecutive trading days. Proceeds from the Offering provide cash resources that are anticipated to support operations into the third quarter of 2027.

The securities have not been registered under the United States Securities Act of 1933, as amended (the "U.S. Securities Act"), or any U.S. state securities laws, and may not be offered or sold to, or for the account or benefit of, persons in the "United States" or "U.S. persons" (as such terms are used in Regulation S under the U.S. Securities Act), absent registration under the U.S. Securities Act and all applicable U.S. state securities laws or in compliance with an exemption therefrom. This news release does not constitute an offer to sell or a solicitation of an offer to buy nor shall there be any sale of any of the securities in any jurisdiction in which such offer, solicitation or sale would be unlawful.

About Cardiol Therapeutics

Cardiol Therapeutics Inc. (NASDAQ: CRDL) (TSX: CRDL) is a clinical-stage life sciences company advancing late-stage, anti-inflammatory and anti-fibrotic therapies for heart disease. The Company's lead small molecule drug candidate, CardiolRx™, modulates inflammasome pathway activation, an intracellular process known to play an important role in the development and progression of inflammation and fibrosis associated with pericarditis, myocarditis, and heart failure.

The MAVERIC Program in recurrent pericarditis, an inflammatory disease of the pericardium which is associated with symptoms including debilitating chest pain, shortness of breath, and fatigue, and results in physical limitations, reduced quality of life, emergency department visits, and hospitalizations, comprises the completed Phase II MAvERIC-Pilot study (NCT05494788) and the ongoing pivotal Phase III MAVERIC trial (NCT06708299). The U.S. FDA has granted Orphan Drug Designation to CardiolRx™ for the treatment of pericarditis, which includes recurrent pericarditis.

The ARCHER Program (NCT05180240) comprises the completed Phase II study in acute myocarditis, an important cause of acute and fulminant heart failure in young adults and a leading cause of sudden cardiac death in people less than 35 years of age.

Cardiol is also developing CRD-38, a novel subcutaneously administered drug formulation intended for use in heart failure-a leading cause of death and hospitalization in the developed world, with associated healthcare costs in the United States exceeding US$30 billion annually.

For more information about Cardiol Therapeutics, please visit cardiolrx.com.

Cautionary statement regarding forward-looking information:

This news release contains "forward-looking information" within the meaning of applicable securities laws. All statements, other than statements of historical fact, that address activities, events, or developments that Cardiol believes, expects, or anticipates will, may, could, or might occur in the future are "forward-looking information". Forward looking information contained herein may include, but is not limited to statements regarding the Company's focus on developing anti-inflammatory and anti-fibrotic therapies for the treatment of heart disease, the Company's intended clinical studies and trial activities and timelines associated with such activities, including the Company's plan to complete the Phase III study in recurrent pericarditis with CardiolRx™, the Company's plan to advance the development of CRD-38, a novel subcutaneous formulation intended for use in heart failure, the Company's presentation and publication of the comprehensive ARCHER trial data, the Company's belief that results from the ARCHER trial provide compelling clinical proof of concept for CardiolRx™ and strongly support advancing the clinical development of CardiolRx™ and CRD-38 for the treatment of inflammatory cardiac disorders including cardiomyopathies, heart failure, and myocarditis, and statements regarding the expected length and scope of funding for the Company's development plans as a result of the Offering. Forward-looking information contained herein reflects the current expectations or beliefs of Cardiol based on information currently available to it and is based on certain assumptions and is also subject to a variety of known and unknown risks and uncertainties and other factors that could cause the actual events or results to differ materially from any future results, performance or achievements expressed or implied by the forward looking information, and are not (and should not be considered to be) guarantees of future performance. These risks and uncertainties and other factors include the risks and uncertainties referred to in the Company's Annual Information Form filed with the Canadian securities administrators and U.S. Securities and Exchange Commission on March 31, 2025, available on SEDAR+ at sedarplus.ca and EDGAR at sec.gov, as well as the risks and uncertainties associated with product commercialization and clinical studies. These assumptions, risks, uncertainties, and other factors should be considered carefully, and investors should not place undue reliance on the forward-looking information, and such information may not be appropriate for other purposes. Any forward-looking information speaks only as of the date of this press release and, except as may be required by applicable securities laws, Cardiol disclaims any intent or obligation to update or revise such forward-looking information, whether as a result of new information, future events, or results, or otherwise. Investors are cautioned not to rely on these forward-looking statements.

For further information, please contact:

Trevor Burns, Investor Relations +1-289-910-0855

trevor.burns@cardiolrx.com

Cardiol Therapeutics Completes US$11.4 Million Financing and Extends Cash Runway into Q3 2027

MAVERIC Phase III pivotal trial of orphan drug candidate CardiolRx™ in recurrent pericarditis is fully funded through to a planned New Drug Application submission with the FDA.
New data from the ARCHER trial, highlighting the magnitude of reduction in left ventricular (LV) mass and the read through to heart failure, to be presented at a cardiology conference in November 2025.
Next-generation therapy CRD-38 for heart failure funded through to clinical development, with partnership discussions advancing with leading pharmaceutical companies.

Toronto, ON - October 21, 2025 - Cardiol Therapeutics Inc. (NASDAQ: CRDL) (TSX: CRDL) ("Cardiol" or the "Company"), a clinical-stage life sciences company advancing late-stage, anti-inflammatory and anti-fibrotic therapies for heart disease, today announced the successful completion of the previously announced private placement offering (the "Offering") of units ("Units") for total proceeds of US$11.4 million, reflecting closing on all funds previously committed under the Offering.

"As recruitment in our pivotal Phase III MAVERIC trial gains momentum, with several prominent centers across the U.S. now enrolling patients, we are pleased to have secured a direct investment of US$11.4 million to strengthen our balance sheet and accelerate the development of our novel heart failure drug, CRD-38, based on the recently reported findings from our ARCHER trial," said David Elsley, President and CEO of Cardiol Therapeutics. "Topline results from our ARCHER trial demonstrated a significant reduction in LV mass-marking the first evidence of structural and remodeling improvement in patients with myocarditis. This landmark finding represents our second clinical validation in inflammatory heart disease and establishes a key translational link to data published earlier this year in the Journal of the American College of Cardiology, which demonstrated the beneficial effects of the active pharmaceutical ingredient or API in CardiolRx on cardiac structure, inflammation, and fibrosis in a model of heart failure. The ARCHER findings support pursuing an additional Orphan Drug Designation for CardiolRx in myocarditis and advancing the development of our next-generation CRD-38 formulation, which delivers the same API via subcutaneous administration, to target the broader heart failure market. Notably, blockbuster drugs that reduce LV mass have been shown to lower heart failure-related death and hospitalization, underscoring the clinical potential of Cardiol's differentiated anti-inflammatory mechanism to address a large unmet need in heart failure, where five-year mortality rates still exceed 50%."

Under the Offering, the Company sold a total of 11.4 million Units at a price of US$1.00 per Unit. Each Unit consists of one Class A common share of the Company (a "Common Share") and one-half of one Common Share purchase warrant. Each whole warrant entitles the holder to acquire one additional Common Share at an exercise price of US$1.35 for a period of 24 months from the date of issuance. The warrants include an acceleration provision, allowing the Company to advance their expiry to the 30^th^ day following the issuance of a news release if the daily volume-weighted average trading price of the Common Shares exceeds US$2.00 for five consecutive trading days. Proceeds from the Offering provide cash resources that are anticipated to support operations into the third quarter of 2027.