ALG-055009

SOUTH SAN FRANCISCO, Calif., May 13, 2026 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS), a clinical stage biopharmaceutical company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced ten abstracts have been accepted for poster presentations at the European Association for the Study of the Liver (EASL) Congress 2026, being held May 27 – 30, 2026 in Barcelona, Spain. The abstracts released today can be found on the EASL website at . Details on the abstracts are as follows: Pevifoscorvir sodium: Potential first-/best-in-class small molecule CAM-E for chronic hepatitis B virus (HBV) infection Abstract #: 588 Title: Sustained reduction of HBV antigen levels at ≥6 months follow-up in HBeAg-positive participants with chronic hepatitis B infection after 96 weeks of 300 mg pevifoscorvir sodium monotherapy Presenter: Professor Lung-Yi Loey Mak, MBBS(HK), MD(HK), MRCP(UK), PDipID (HK), FHKCP, FHKAM (Medicine), FRCP (Glasg), FRCP (Edin), FRCP, Clinical Assistant Professor at The University of Hong Kong Date/Time: May 27, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis B and D: New therapies, unapproved therapies or strategies Abstract #: 602 Title: Pevifoscorvir sodium demonstrated profound antiviral activity in untreated HBeAg+ subjects, regardless of baseline ALT level Presenter: Professor Man-Fung Yuen, MBBS, MD, PhD, DSc, Chair and Chief of the Division of Gastroenterology and Hepatology, University of Hong Kong Date/Time: May 27, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis B and D: New therapies, unapproved therapies or strategies Abstract #: 586 Title: Population pharmacokinetics of pevifoscorvir sodium (ALG-000184) in healthy participants and participants with chronic hepatitis B in support of phase 2 dose selection Presenter: Kha Le, PhD Date/Time: May 27, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis B and D: New therapies, unapproved therapies or strategies Abstract #: 570 Title: ALG-001075, the parent of pevifoscorvir sodium, exhibits potent in vitro antiviral properties compared to other HBV capsid assembly modulators in clinical development Presenter: Yannick Debing, PhD Date/Time: May 28, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis: Experimental and pathophysiology Abstract #: 634 Title: Potent and durable off-treatment reduction of HBsAg levels and cccDNA-derived transcripts by the CAM-E ALG-001075 in cell-based experiments Presenter: Professor Barbara Testoni, PhD, HDR, DR2 INSERM - Team Leader "Hepatitis Viruses and Liver pathogenesis". Université Claude Bernand Lyon 1, Inserm UMR 1350 - PaThLiv Date/Time: May 28, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis: Experimental and pathophysiology ALG-170675: Potential best-in-class antisense oligonucleotide (ASO) for chronic hepatitis B virus (HBV) infection Abstract #: 587 Title: The potentially best-in-class HBV ASO ALG-170674 demonstrates additive to synergistic antiviral activities when combined with other anti-HBV modalities Presenter: Jin Hong, PhD Date/Time: May 28, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis: Experimental and pathophysiology ALG-055009: Potential best-in-class small molecule THR- β Agonist for Metabolic Dysfunction-Associated Steatohepatitis (MASH) Abstract #: 184 Title: Synergistic fat mass loss in diet-induced obese mice when thyroid hormone receptor-β agonist ALG-055009 was administered in combination with incretin receptor agonists Presenter: Xuan Luong, PhD Date/Time: May 30, 2025 at 8:30am – 4:00pm CET Session: Poster - MASLD: Experimental and pathophysiology Preclinical Abstract #: 606 Title: Antisense oligonucleotide-based strategy to target hepatitis delta virus infections Presenter: Julie Lucifora, PhD, HDR, Director of Research, INSERM, CIRI - Centre International de Recherche en Infectiologie Date/Time: May 28, 2026 at 12:45 – 1:45pm CET; May 28, 2026 at 8:30am – 5:00pm CET Session: Poster Tour – Track 8 – Viral Hepatitis; Viral Hepatitis: Experimental and pathophysiology Abstract #: 610 Title: Discovery of novel HDV entry inhibitors with selectivity over bile acid inhibition Presenter: David McGowan, MS Date/Time: May 28, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis: Experimental and pathophysiology Abstract #: 620 Title: Preclinical characterization of ALG-093940, a potent and orally bioavailable small molecule PD-1/PD-L1 inhibitor for the treatment of chronic hepatitis B infection and liver cancer Presenter: Heleen Roose, PhD Date/Time: May 28, 2026 at 8:30am – 5:00pm CET Session: Viral Hepatitis: Experimental and pathophysiology About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biotechnology company founded with the mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Aligos applies its science driven approach and deep R&D expertise to advance its purpose-built pipeline of therapeutics for high unmet medical needs such as chronic hepatitis B virus infection, metabolic dysfunction-associated steatohepatitis (MASH), obesity, and coronaviruses. For more information, please visit or follow us on LinkedIn or X. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Any statements in this press release that are not historical facts may be considered “forward-looking statements,” including without limitation, statements regarding Aligos’ financial results and performance as well as research and development activities, including regulatory status and the timing of announcements and updates relating to our regulatory filings and clinical trials. Such forward looking statements are subject to substantial risks and uncertainties that could cause our development programs, future results, performance, or achievements to differ materially from those anticipated in the forward-looking statements. Such risks and uncertainties include, without limitation, risks and uncertainties inherent in the drug development process, including Aligos’ clinical-stage of development, the process of designing and conducting clinical trials, the regulatory approval processes, and other matters that could affect the sufficiency of Aligos’ capital resources to fund operations. For a further description of the risks and uncertainties that could cause actual results to differ from those anticipated in these forward-looking statements, as well as risks relating to the business of Aligos in general, see Aligos’ Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 7, 2026 and its future periodic reports to be filed or submitted with the Securities and Exchange Commission. Except as required by law, Aligos undertakes no obligation to update any forward-looking statements to reflect new information, events or circumstances, or to reflect the occurrence of unanticipated events. Investor Contact Aligos Therapeutics, Inc. Jordyn Tarazi Vice President, Investor Relations & Corporate Communications +1 (650) 910-0427 jtarazi@aligos.com Media Contact Inizio Evoke Jake Robison Vice President Jake.Robison@inizioevoke.com

SOUTH SAN FRANCISCO, Calif., May 07, 2026 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS, “Aligos”), a clinical stage biotechnology company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today reported recent business progress and financial results for the first quarter 2026. “I am pleased to continue building on our progress made so far in 2026,” stated Lawrence Blatt, Ph.D., M.B.A., Chairman, President, and Chief Executive Officer of Aligos Therapeutics. “Receiving Fast Track Designation is confirmation that an unmet medical need exists in chronic HBV infection and pevifoscorvir sodium has the potential to be superior to current therapies based on clinical data to date, which was evaluated by the FDA when determining the granting of this designation. In addition, we completed the first interim analysis for the B-SUPREME HBeAg- cohort with a positive outcome reflecting that the study will continue, the futility criteria were not met, and study drugs were well tolerated. The recommendation from the DSMB to increase participants has the potential to increase the probability of success of the B-SUPREME study. It is important to note, that prior to the B-SUPREME study there has not been a randomized controlled study of treatment naïve chronic HBV infection participants using tenofovir disoproxil fumarate (TDF) as the active comparator to measure HBV DNA response with the most sensitive PCR assay currently available (LLOQ <10 IU/mL). Also, we are pleased to build on our existing relationship with Amoytop with the partnership of pevifoscorvir sodium in Greater China which can potentially accelerate approval in the region. Taken together, this progress demonstrates how our team has continued to execute on our goals. As we look forward to the back half of the year, I am excited for our continued developments as we progress pevifoscorvir sodium and our other drug candidates. In particular, I look forward to providing updates on our potentially best-in-class ASO for chronic HBV infection, which is moving nicely through IND-enabling studies.” Recent Business Progress Pipeline Updates Pevifoscorvir sodium: Potential first-/best-in-class small molecule CAM-E for chronic hepatitis B virus (HBV) infection Pevifoscorvir sodium was granted Fast Track Designation by the U.S. Food and Drug Administration (FDA) for chronic hepatitis B virus (HBV) infection. The Phase 2 B-SUPREME study (NCT06963710) is currently ongoing. As of April 2026, there were 74 participants enrolled in the HBeAg- cohort (Part 2a), with 103 participants enrolled in the HBeAg+ cohort (Part 1a). The study design for the Phase 2 B-SUPREME study includes pre-specified sample size re-estimations for both Parts 1a and 2a to ensure sufficient power to demonstrate a statistically significant treatment effect at the primary endpoint. The first pre-specified interim analysis of the Phase 2 B-SUPREME study was performed after approximately 60% of HBeAg- participants (N=34, Part 2a) reached Week 12 or later. In addition, safety data was reviewed for all participants enrolled in the study (N=174) at the time the interim analysis was performed. Findings from the first interim analysis include: The Drug Safety Monitoring Board (DSMB) recommended increasing the sample size of Part 2a from 74 currently enrolled to 100 participants. A futility analysis was performed; the prespecified futility criteria were not met, per the statistical analysis plan. The study drugs were well-tolerated with no clinically concerning laboratory, physical examination, vital sign, or ECG abnormalities. No viral breakthrough related to study drugs has been observed in the study to date. A second protocol defined interim analysis is planned when ~50% of HBeAg+ participants complete 24 weeks of the treatment period, with this enrollment threshold previously reached in January 2026. The second interim analysis is expected in the second half of 2026. Topline data for both the HBeAg- and HBeAg+ cohorts are expected in 2027. 96-weeks of dosing have been completed in the Phase 1 study (NCT04536337) with long-term post-treatment data expected to be presented at the upcoming European Association for the Study of the Liver (EASL) 2026 Congress. The Company entered into an exclusive license deal with Xiamen Amoytop Biotech Co., Ltd. (Amoytop) to develop and commercialize pevifoscorvir sodium in Greater China for chronic HBV infection. Along with a $25M USD upfront, Aligos is entitled to up to $420M USD in clinical, regulatory, and sales milestones with tiered, high single-digit royalties. The Drug Safety Monitoring Board (DSMB) recommended increasing the sample size of Part 2a from 74 currently enrolled to 100 participants. A futility analysis was performed; the prespecified futility criteria were not met, per the statistical analysis plan. The study drugs were well-tolerated with no clinically concerning laboratory, physical examination, vital sign, or ECG abnormalities. No viral breakthrough related to study drugs has been observed in the study to date. ALG-170675: Potential best-in-class antisense oligonucleotide (ASO) for chronic hepatitis B virus (HBV) infection Along with our partner Amoytop, ALG-170675 has begun IND-enabling studies. Current costs for development in China are being funded by Amoytop, who maintain rights in Greater China. This next-generation ASO works via two mechanisms of action. It targets and destroys HBsAg-encoding mRNA and activates the immune response through TLR-8 agonism. ALG-055009: Potential best-in-class small molecule THR-β for obesity, MASH Additional nonclinical data demonstrating the potential synergies of ALG-055009 and incretin receptor agonists are expected to be presented at upcoming scientific conferences. Evaluation of a variety of options to fund continued development, including potential out-licensing, is ongoing. Financial Results for the Three Months Ended March 31, 2026 Cash, cash equivalents and investments totaled $54.9 million as of March 31, 2026, compared with $77.8 million as of December 31, 2025. Our cash, cash equivalents and investments are expected to provide sufficient funding of planned operations into the fourth quarter of 2026, inclusive of the $25M upfront expected from the Amoytop Greater China License deal for pevifoscorvir sodium. Net loss for the three months ended March 31, 2026 was $23.0 million or basic and diluted net loss per common share of $(2.21), compared to net income of $43.1 million or basic net income per common share of $5.12, and diluted net loss per common share of $(2.11) for the three months ended March 31, 2025. Research and development (R&D) expenses for the three months ended March 31, 2026 were $23.4 million, compared with $14.5 million for the same period of 2025. The increase was primarily due to an increase in third-party expenses for the pevifoscorvir sodium Phase 2 clinical trial. Total R&D stock-based compensation expense incurred for the three months ended March 31, 2026 was $0.7 million, compared with $0.5 million for the same period of 2025. General and administrative (G&A) expenses for the three months ended March 31, 2026 were $6.4 million, compared with $5.1 million for the same period of 2025. The decrease in G&A expenses for this comparative period is primarily due to a decrease in legal and other related expenses. Total G&A stock-based compensation expense incurred for the three months ended March 31, 2026 was $0.6 million, compared with $0.4 million for the same period of 2025. Interest and other income, net, was income of $0.8 million for the three months ended March 31, 2026 compared with income of $0.9 million for the same period in 2025. Change in fair value of 2023 common warrants for the three months ended March 31, 2026, was income of $3.4 million compared with income of $61.5 million for the same period of 2025. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biotechnology company founded with the mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Aligos applies its science driven approach and deep R&D expertise to advance its purpose-built pipeline of therapeutics for high unmet medical needs such as chronic hepatitis B virus (HBV) infection, metabolic dysfunction-associated steatohepatitis (MASH), obesity, and coronaviruses. For more information, please visit www.aligos.com or follow us on LinkedIn or X. Forward-Looking Statement This press release contains forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Any statements in this press release that are not historical facts may be considered “forward-looking statements,” including without limitation, statements with respect to the expected data releases and data presentations for the Company’s ASO program in HBV and for the pevifoscorvir sodium Phase I study, and timing of data readouts for the pevifoscorvir sodium B-SUPREME study; the expected data presentations for ALG-055009; potential success of the Company’s development programs; statements regarding potential financial milestones being met and future royalties being earned by Aligos under the Amoytop license, and regarding Amoytop’s success in developing pevifoscorvir sodium in Greater China; and the company’s expectation that its cash, cash equivalents and investments provide sufficient funding of planned operations into the fourth quarter of 2026. Forward-looking statements are typically, but not always, identified by the use of words such as “may,” “will,” “would,” “believe,” “intend,” “plan,” “anticipate,” “estimate,” “expect,” and other similar terminology indicating future results. Such forward looking statements are subject to substantial risks and uncertainties that could cause our development programs, future results, performance, or achievements to differ materially from those anticipated in the forward-looking statements. Such risks and uncertainties include, without limitation, risks and uncertainties inherent in the drug development process, including Aligos’ clinical-stage of development, the process of designing and conducting clinical trials, the regulatory approval processes, the timing of regulatory filings, the challenges associated with manufacturing drug products, Aligos’ ability to successfully establish, protect and defend its intellectual property, other matters that could affect the sufficiency of Aligos’ capital resources to fund operations, reliance on third parties for manufacturing and development efforts, changes in the competitive landscape and the impact of global events and other macroeconomic conditions on Aligos’ business. For a further description of the risks and uncertainties that could cause actual results to differ from those anticipated in these forward-looking statements, as well as risks relating to the business of Aligos in general, see Aligos’ Quarterly Report on Form 10-Q to be filed with the Securities and Exchange Commission on May 7, 2026 and Aligos’ Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 5, 2026 and its future periodic reports to be filed or submitted with the Securities and Exchange Commission. Except as required by law, Aligos undertakes no obligation to update any forward-looking statements to reflect new information, events or circumstances, or to reflect the occurrence of unanticipated events. Investor Contact Jordyn Tarazi Vice President, Investor Relations & Corporate Communications +1 (650) 910-0427 jtarazi@aligos.com _____________________________________________ (1) The condensed consolidated balance sheet as of December 31, 2025 has been derived from the audited consolidated financial statements at that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.