[8-K] Arbutus Biopharma Corp Reports Material Event

Rhea-AI Filing Summary

Arbutus Biopharma Corporation filed a current report stating that its Chairperson, Chief Executive Officer and President, Lindsay Androski, is giving a presentation on the company’s ongoing patent litigation involving its lipid nanoparticle technology used in COVID-19 vaccines at Roivant Sciences Ltd.’s 2025 Investor Day. The related litigation slide deck is furnished as Exhibit 99.1 and incorporated by reference.

The company notes that these slides contain forward-looking statements about its plans and expected timing for the litigation. It cautions that these statements rely on assumptions and are subject to significant uncertainties, including risks associated with litigation generally, economic and market conditions, possible shifts in strategic focus, and the sufficiency of its cash resources. Arbutus refers readers to risk discussions in its annual and quarterly SEC reports and other continuous disclosure filings.

8-K Event Classification

2 items: 8.01, 9.01

2 items

Item 8.01 Other Events Other

Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Understanding 8-K Material Events →

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 11, 2025

Arbutus Biopharma Corporation

(Exact name of registrant as specified in its charter)

British Columbia, Canada		001-34949		98-0597776
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

701 Veterans Circle Warminster, Pennsylvania		18974
(Address of principal executive offices)		(Zip Code)

(267) 469-0914

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Shares, without par value		ABUS		The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.   o

Item 8.01. Other Events.

On December 11, 2025, Lindsay Androski, Chairperson, Chief Executive Officer and President of Arbutus Biopharma Corporation (the “Company”) will give a presentation regarding the Company’s ongoing lawsuits against Moderna Therapeutics, Inc., Pfizer Inc. and BioNTech SE, for their use of the Company’s patented lipid nanoparticle technology in their COVID-19 vaccines (“LNP Litigation”), as part of Roivant Sciences Ltd.’s 2025 Investor Day. The LNP Litigation slides that Ms. Androski will present are filed herewith as Exhibit 99.1 and are incorporated by reference herein.

The LNP Litigation slides contain forward-looking statements within the meaning of the Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, and forward-looking information within the meaning of Canadian securities laws (collectively, forward-looking statements). Forward-looking statements in the LNP Litigation slides include statements about the Company’s plans with respect to the ongoing patent litigation matters, and the expected timing thereof. With respect to the forward-looking statements contained in the LNP Litigation slides, the Company has made numerous assumptions regarding the LNP Litigation. While the Company considers these assumptions to be reasonable, these assumptions are inherently subject to significant business, economic, competitive, market and social uncertainties and contingencies. Additionally, there are known and unknown risk factors which could cause the Company’s actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements contained therein. Known risk factors include, among others: uncertainties associated with litigation generally and patent litigation specifically; economic and market conditions may worsen; market shifts may require a change in strategic focus; and risks related to the sufficiency of the Company’s cash resources for its foreseeable and unforeseeable operating expenses and capital expenditures.

A more complete discussion of the risks and uncertainties facing the Company appears in the Company’s Annual Report on Form 10-K, the Company’s Quarterly Reports on Form 10-Q and the Company’s continuous and periodic disclosure filings, which are available at www.sedar.com and at www.sec.gov. All forward-looking statements in the LNP Litigation slides are qualified in their entirety by this cautionary statement, and the Company disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained in the LNP Litigation slides to reflect future results, events or developments, except as required by law.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number		Description
99.1		Presentation by Lindsay Androski on December 11, 2025
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURE

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 hereunto duly authorized.

	Arbutus Biopharma Corporation
Date: December 11, 2025	By:	/s/ Tuan Nguyen
	Name:	Tuan Nguyen
	Title:	Chief Financial Officer

FAQ

What did Arbutus Biopharma (ABUS) disclose in this Form 8-K?

Arbutus Biopharma disclosed that its Chairperson, Chief Executive Officer and President, Lindsay Androski, will present an overview of the company’s ongoing patent litigation related to its lipid nanoparticle technology used in COVID-19 vaccines at Roivant Sciences Ltd.’s 2025 Investor Day, and that the corresponding slide presentation is filed as Exhibit 99.1.

What is the main topic of Arbutus Biopharma’s investor day presentation mentioned in the 8-K?

The main topic of the presentation is Arbutus Biopharma’s ongoing lawsuits concerning its patented lipid nanoparticle (LNP) technology used in COVID-19 vaccines, referred to as the LNP Litigation.

Where can investors find the LNP Litigation slides referenced by Arbutus Biopharma (ABUS)?

The LNP Litigation materials are included as Exhibit 99.1 to the Form 8-K. The company states that these slides are filed with the report and incorporated by reference.

What type of statements does Arbutus Biopharma say are included in the LNP Litigation slides?

Arbutus Biopharma states that the slides contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934, and forward-looking information under Canadian securities laws.

What key risks and uncertainties related to the LNP Litigation does Arbutus Biopharma highlight?

The company highlights risks including uncertainties associated with litigation generally and patent litigation specifically, potential worsening of economic and market conditions, possible market shifts requiring a change in strategic focus, and risks related to the sufficiency of its cash resources for operating expenses and capital expenditures.

Where does Arbutus Biopharma (ABUS) direct investors for more details on its risk factors?

Arbutus directs investors to the risk factor discussions in its Annual Report on Form 10-K, its Quarterly Reports on Form 10-Q, and its other continuous and periodic disclosure filings available at www.sedar.com and www.sec.gov.