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Arbutus Reports Third Quarter 2025 Financial Results and Provides Corporate Update

1. Arbutus has $93.7M in cash and securities. 2. Imdusiran shows 46% Phase 2a patients can discontinue treatment. 3. Ongoing lawsuits against Moderna and Pfizer may provide compensation. 4. Clinical data demonstrates efficacy of AB-729 in chronic HBV. 5. Net loss reduced to $7.7M compared to $19.7M year-over-year.

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FAQ

Why Bullish?

Positive clinical results and a significant reduction in net loss improve investor sentiment. The approval of imdusiran could lead to substantial future revenue, similar to other biotech firms that experienced stock rallies following successful clinical data.

How important is it?

The financial results and positive clinical data are crucial for ABUS's market position and future growth. Improvements in cash reserves and decreases in losses may attract investor confidence moving forward.

Why Long Term?

While short-term fluctuations may occur, sustained investment interest is likely due to promising drug development. Full market potential for imdusiran may take years, similar to other FDA-approved therapies following successful Phase 2 trials.

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Strong financial position with cash, cash equivalents and marketable securities of $93.7M  Moderna litigation U.S. trial scheduled for March 2026;Favorable claim construction ruling in Pfizer-BioNTech litigation issued in September 2025  Additional analysis of imdusiran (AB-729) clinical data shows:-46% of Phase 2a patients met criteria to discontinue all treatment-94% of long-term follow-up patients remain off all treatment for up to 2+ years-100% of HBV DNA positive patients in Phase 1b achieved HBV DNA levels belowquantification after only 18 weeks of imdusiran and nucleos(t)ide analogue therapy-All HBV e-antigen positive patients demonstrated dose-dependent HBV e-antigen decreases   WARMINSTER, Pa., Nov. 13, 2025 (GLOBE NEWSWIRE) -- Arbutus Biopharma Corporation (Nasdaq: ABUS) (“Arbutus” or the “Company”), a clinical-stage biopharmaceutical company focused on infectious disease, today reported third quarter 2025 financial results and provided a corporate update. “The strength of our third quarter performance reflects our disciplined focus on executing strategic priorities,” said Lindsay Androski, President and CEO of Arbutus. “We are also excited to share additional analysis of imdusiran clinical data being conducted as part of our ongoing strategic review. Notably, in addition to the eight patients who initially achieved functional cure with imdusiran at 60mg in our Phase 2a trials, forty more patients across all cohorts discontinued nucleos(t)ide analogue therapy after meeting study-defined criteria. In total, a combined 46% of all Phase 2a patients were able to discontinue all treatment. All but one patient who achieved functional cure or who we are following after discontinuing nucleos(t)ide analogue therapy remain off all treatment long-term, now exceeding two years for some patients. Across our Phase 1b and Phase 2a trials, imdusiran has demonstrated sustained benefits in chronic hepatitis B patients, regardless of baseline hepatitis B surface antigen levels, hepatitis B virus DNA presence or absence, and hepatitis B e-antigen positivity or negativity. We remain dedicated to accelerating the development and potential approval of imdusiran.” LNP Litigation Arbutus continues to consult closely with and support its exclusive licensee, Genevant Sciences, to protect and defend Arbutus’s intellectual property, which is the subject of on-going lawsuits against Moderna and Pfizer/BioNTech. The Company, together with Genevant, is seeking fair compensation for Moderna’s and Pfizer/BioNTech’s use of Arbutus’s patented LNP technology that was developed with great effort and at a great expense, and without which Moderna’s and Pfizer/BioNTech’s COVID-19 vaccines would not have been successful.In the Moderna U.S. litigation, fact discovery, expert discovery and summary judgment briefing have been completed. A jury trial is scheduled for March 2026. In March 2025, the Company, alongside Genevant Sciences, filed five international lawsuits against Moderna and its affiliates seeking to enforce patents protecting the Company’s patented LNP technology across 30 countries. Public oral hearings for two of the five cases which are before the Unified Patent Court are scheduled for May 2026, and a trial in the Canadian case is set to begin in September 2027.The claim construction hearing for the lawsuit against Pfizer/BioNTech occurred in December 2024, and the court issued a claim construction ruling in September 2025, which construed the disputed claim terms in a manner the Company generally considers to be favorable. Corporate Updates The Company showcased four poster presentations featuring data from its hepatitis B virus (HBV) programs at AASLD 2025. One poster presented new analysis from the Company’s IM-PROVE I Phase 2a clinical trial showing beneficial clinical outcomes were observed across all evaluated HBV genotypes (A to E). The Company also had a Poster of Distinction highlighting AB-101’s maximal PD-L1 receptor occupancy between 68-100% at a 30mg daily dose.Today, the Company published an updated Corporate Presentation on its website, which includes the results of its recently completed analysis of imdusiran clinical data. In addition to the eight functional cures, an additional 40 patients across all cohorts in its Phase 2a trials met study-defined criteria for nucleos(t)ide analogue (NA) therapy discontinuation.In total, 46% (48/105) of all Phase 2a patients either achieved functional cure or remained off NA therapy for at least 48 weeks after discontinuing NA therapy following treatment with imdusiran.Eighteen patients consented to long-term follow-up, including all functionally cured patients and 10 patients who discontinued NA therapy. To date, 94% of those follow-up patients have remained off all treatment for between 58 to 109 weeks. One functionally cured patient seroreverted but remains virally suppressed and off all treatment.Additionally, 56% (5/9) of Phase 1b patients (only received imdusiran and NA therapy) who elected to discontinue NA therapy, remained off all treatment for at least 3 years.Imdusiran has also demonstrated steep and durable declines in HBV DNA, and, with NA therapy, achieved full HBV DNA suppression significantly faster than NA therapy alone. By week 18 of treatment with imdusiran and NA therapy, 100% of Phase 1b HBV DNA positive patients achieved HBV DNA levels below the level of quantification, The eight Phase 2a patients who achieved functional cure continue to have HBV DNA levels below the level of quantification.In 30 hepatitis B e-antigen (HBeAg) positive patients in our Phase 1 and 2a trials, HBeAg decreased in all patients in a dose-dependent manner. Financial Results Cash, Cash Equivalents and Investments As of September 30, 2025, the Company had cash, cash equivalents and investments in marketable securities of $93.7 million compared to $122.6 million as of December 31, 2024. During the nine months ended September 30, 2025, the Company used $35.0 million in operating activities, which included one-time payments related to its restructuring efforts. This was partially offset by $3.9 million of proceeds from the exercise of stock options. Revenue Total revenue was $0.5 million for the quarter ended September 30, 2025, compared to $1.3 million for the same period in 2024. The decrease of $0.8 million was due to a decrease in license royalty revenues, primarily due to a decline in Alnylam’s sales of ONPATTRO. Operating Expenses Research and development expenses were $5.8 million for the quarter ended September 30, 2025, compared to $14.3 million for the same period in 2024. The decrease of $8.5 million was due primarily to cost savings from the Company’s decisions to streamline the organization to focus its efforts on advancing the clinical development of imdusiran and AB-101, which included ceasing all discovery efforts, discontinuing its IM-PROVE III clinical trial, and reducing the Company’s workforce. General and administrative expenses were $3.0 million for the quarter ended September 30, 2025, compared to $4.5 million for the same period in 2024. This decrease was due primarily to cost-cutting efforts by the Company, which drove reductions in employee compensation-related expenses and legal fees. Restructuring costs in the quarter ended September 30, 2025 were $0.1 million, and all remaining restructuring-related payments are expected to be made by the first quarter of 2026. Net Loss For the quarter ended September 30, 2025, the Company’s net loss was $7.7 million, or a loss of $0.04 per basic and diluted common share, as compared to a net loss of $19.7 million, or a loss of $0.10 per basic and diluted common share, for the quarter ended September 30, 2024. Outstanding Shares As of September 30, 2025, the Company had 192.0 million common shares issued and outstanding, as well as 14.9 million stock options and unvested restricted stock units outstanding.  UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND LOSS(in thousands, except share and per share data)  Three Months Ended September 30, Nine Months Ended September 30,  2025   2024   2025   2024 Revenue       Collaborations and licenses$280  $767  $11,809  $2,861 Non-cash royalty revenue 249   572   1,223   1,736 Total Revenue 529   1,339   13,032   4,597 Operating expenses       Research and development 5,778   14,273   20,235   45,227 General and administrative 3,044   4,537   12,204   17,396 Change in fair value of contingent consideration 268   344   827   735 Restructuring costs 98   3,625   12,636   3,625 Total operating expenses 9,188   22,779   45,902   66,983 Loss from operations (8,659)  (21,440)  (32,870)  (62,386)Other income       Interest income 952   1,747   3,191   5,121 Interest expense (23)  (29)  (79)  (107)Foreign exchange (loss) gain (12)  5   13   (16)Total other income 917   1,723   3,125   4,998 Income tax expense —   —   —   — Net loss$(7,742) $(19,717) $(29,745) $(57,388)Net loss per common share       Basic and diluted$(0.04) $(0.10) $(0.16) $(0.31)Weighted average number of common shares       Basic and diluted 191,778,950   188,997,194   191,347,969   184,244,819    UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS(in thousands)    September 30, 2025 December 31, 2024Cash, cash equivalents and marketable securities, current $93,702  $122,623 Accounts receivable and other current assets  3,740   4,693 Total current assets  97,442   127,316 Property and equipment, net of accumulated depreciation and impairment  137   3,309 Right of use asset  —   1,048 Other non-current assets  131   34 Total assets $97,710  $131,707        Accounts payable and accrued liabilities $4,653  $7,564 Deferred license revenue, current  —   7,571 Lease liability, current  531   483 Total current liabilities  5,184   15,618 Liability related to sale of future royalties  3,684   4,829 Deferred license revenue, non-current  —   2,863 Contingent consideration  11,052   10,225 Lease liability, non-current  391   806 Total stockholders’ equity  77,399   97,366 Total liabilities and stockholders’ equity $97,710  $131,707   UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(in thousands)  Nine Months Ended September 30,  2025   2024 Net loss$(29,745) $(57,388)Non-cash items 6,609   5,453 Change in deferred license revenue (10,434)  (880)Other changes in working capital (1,387)  (1,720)Net cash used in operating activities (34,957)  (54,535)Net cash provided by investing activities 16,941   9,537 Issuance of common shares pursuant to the Open Market Sale Agreement —   44,124 Cash provided by other financing activities 4,081   6,451 Net cash provided by financing activities 4,081   50,575 Effect of foreign exchange rate changes on cash and cash equivalents 13   (16)(Decrease) / Increase in cash and cash equivalents (13,922)  5,561 Cash and cash equivalents, beginning of period 36,330   26,285 Cash and cash equivalents, end of period 22,408   31,846 Investments in marketable securities 71,294   85,725 Cash, cash equivalents and marketable securities, end of period$93,702  $117,571          About Imdusiran (AB-729) Imdusiran is an RNAi therapeutic specifically designed to reduce all hepatitis B viral proteins and antigens including HBsAg, which is thought to be a key prerequisite to enable reawakening of a patient’s immune system to control the virus. Imdusiran targets hepatocytes using Arbutus’ novel covalently conjugated N-Acetylgalactosamine (“GalNAc”) delivery technology enabling subcutaneous delivery. To date, Arbutus has reported a total of eight patients with cHBV who have achieved a functional cure following treatment with imdusiran and NA therapy in combination with either IFN or low dose nivolumab plus an immunotherapeutic, with seven out of the eight patients continuing to sustain functional cure for over a year after treatment. An additional 40 patients across our Phase 2a clinical trials were able to remain off NA therapy for at least 48 weeks after discontinuing NA therapy following treatment with imdusiran. Clinical data generated thus far has shown imdusiran to be generally safe and well-tolerated, while also providing meaningful reductions in HBsAg and hepatitis B virus DNA. About HBV Hepatitis B is a potentially life-threatening liver infection caused by HBV. HBV can cause chronic infection which leads to a higher risk of death from cirrhosis and liver cancer. cHBV infection represents a significant unmet medical need. The World Health Organization estimates that over 250 million people worldwide suffer from cHBV infection, while other estimates indicate that approximately 2 million people in the United States suffer from cHBV infection. Approximately 1.1 million people die every year from complications related to cHBV infection despite the availability of effective vaccines and current treatment options. About Arbutus Arbutus Biopharma Corporation (Nasdaq: ABUS) is a clinical-stage biopharmaceutical company focused on infectious disease. The Company is currently developing imdusiran (AB-729) and an oral PD-L1 inhibitor (AB-101) for the treatment of cHBV infection. The Company is also consulting closely with and supporting its exclusive licensee, Genevant Sciences, to protect and defend its intellectual property, which is the subject of on-going lawsuits against Moderna and Pfizer/BioNTech for use of Arbutus’s patented LNP technology in their COVID-19 vaccines. For more information, visit www.arbutusbio.com. Forward-Looking Statements and Information This press release contains 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 this press release include statements about: the potential to lead to a functional cure for HBV and/or the discontinuation of HBV therapies after treatment with Arbutus’ product candidates; the durability of clinical benefits from Arbutus’ product candidates; the potential for Arbutus’ product candidates to achieve success in clinical trials; Arbutus’ pipeline and development plans for its cHBV programs; and Arbutus’ plans with respect to the ongoing patent litigation matters, and the expected timing thereof. With respect to the forward-looking statements contained in this press release, Arbutus has made numerous assumptions regarding, among other things: the effectiveness and timeliness of clinical trials, and the usefulness of the data; the continued demand for Arbutus’ assets; and the stability of economic and market conditions. While Arbutus 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 Arbutus’ 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 herein. Known risk factors include, among others: ongoing and anticipated clinical trials may be more costly or take longer to complete than anticipated, and may never be initiated or completed, or may not generate results that warrant future development of the tested product candidate; Arbutus may elect to change its strategy regarding its product candidates and clinical development activities; Arbutus may not receive the necessary regulatory approvals for the clinical development of Arbutus’ product candidates; uncertainties associated with litigation generally and patent litigation specifically; economic and market conditions may worsen; market shifts may require a change in strategic focus; Arbutus’ workforce reduction and plans to reduce its net cash burn may not materially extend the cash runway and may create a distraction or uncertainty that may adversely affect its operating results, business, or investor perceptions; and risks related to the sufficiency of Arbutus’ cash resources for its foreseeable and unforeseeable operating expenses and capital expenditures. A more complete discussion of the risks and uncertainties facing Arbutus appears in Arbutus’ Annual Report on Form 10-K, Arbutus’ Quarterly Reports on Form 10-Q and Arbutus’ continuous and periodic disclosure filings, which are available at www.sedar.com and at www.sec.gov. All forward-looking statements herein are qualified in their entirety by this cautionary statement, and Arbutus 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 herein to reflect future results, events or developments, except as required by law.

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