ALGS

SOUTH SAN FRANCISCO, Calif., Aug. 06, 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 second quarter 2026. “Our team has continued to execute on our key strategic priorities to advance our pipeline this year,” stated Lawrence Blatt, Ph.D., M.B.A., Chairman, President, and Chief Executive Officer of Aligos Therapeutics. “We strengthened our financial position through non-dilutive capital, including the $25M upfront payment related to the exclusive Greater China license for pevifoscorvir sodium. In addition, our partner Amoytop has advanced our potential best-in-class ASO for chronic HBV infection, bringing the program through IND approval in China, resulting in a $3M milestone payment. Pevifoscorvir sodium continues to make significant progress, highlighted by the completion of enrollment for the Phase 2 B-SUPREME study and the receipt of Breakthrough Designation in China for chronic HBV infection. As we look ahead to topline data from the B-SUPREME study which is expected in late Q3 next year, we remain confident that our differentiated pipeline has the potential to meaningfully reduce the burden of end-stage liver disease and liver cancer, the main goal of chronic HBV infection treatment.” Recent Business Progress Pipeline Updates Pevifoscorvir sodium: Potential first-/best-in-class small molecule CAM-E for chronic hepatitis B virus (HBV) infection In addition to Fast Track Designation from the U.S. Food and Drug Administration, pevifoscorvir sodium was granted Breakthrough Therapy Designation from the Center for Drug Evaluation (CDE) of China’s National Medical Products Administration (NMPA) for chronic hepatitis B virus (HBV) infection. The Phase 2 B-SUPREME study (NCT06963710) has completed enrollment with 131 participants enrolled in the HBeAg+ cohort (Part 1a) and 114 participants enrolled in the HBeAg- cohort (Part 2a). Topline data for both the HBeAg+ and HBeAg- cohorts are expected in late Q3 2027. 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. Aligos received the $25M upfront and is entitled to up to $420M USD in clinical, regulatory, and sales milestones with tiered, high single-digit royalties. According to a recently published paper by Papatheodoridis, et. al. (Journal of Hepatology, July 2026), despite >10 years of nucleos(t)ide analog therapy, patients with chronic HBV infection remain at risk for hepatocellular carcinoma. Chronic HBV infection remains a large unmet medical need with ~240 million patients worldwide and 1.2 million new infections each year according to the World Health Organization. ALG-170675: Potential best-in-class antisense oligonucleotide (ASO) for chronic hepatitis B virus (HBV) infection ALG-170675 is a next-generation ASO discovered as part of a research collaboration with Amoytop, who maintain rights in Greater China. Novel intellectual property has been filed for this candidate, which has shown improved RNase H mediated in vivo activity over GSK-836 (bepirovirsen) with similar hTLR8 agonist activity observed in vitro and in vivo. In addition, ALG-170675 utilizes novel monomers that could potentially reduce ASO toxicity and improve ASO liver to kidney ratios. Additionally, nonclinical studies have shown additive to synergistic effects when combined with a CAM-E. Our partner Amoytop received IND approval in China for ALG-170675, and is expected to advance the program into clinical studies with a Phase 1 SAD/MAD study in healthy volunteers, followed by multiple doses in participants with chronic HBV infection in China. Current costs for development in China are being funded by Amoytop, who maintain rights in Greater China. Amoytop’s receipt of IND approval in China for ALG-170675 triggered a $3M milestone payment to Aligos, which is expected to be received in Q3 2026. Under our agreement with Amoytop, Aligos retains ex-Greater China rights and all data generated by either partner can be used in their respective territories. Aligos has the potential to conduct a Phase 2 study in 2028, which may include combination therapy (e.g. pevifoscorvir sodium). Each party is responsible for their own development costs. Financial Results for the Three Months Ended June 30, 2026 Cash, cash equivalents and investments totaled $30.4 million as of June 30, 2026, compared with $77.8 million as of December 31, 2025. This excludes the $25M upfront payment received from Amoytop in July 2026. Our cash and cash equivalents are expected to provide sufficient funding of planned operations through the fourth quarter of 2026. Net loss for the three months ended June 30, 2026 was $1.5 million or basic and diluted net loss per common share of $(0.14), compared to net loss of $15.9 million or basic and diluted net loss per common share of $(1.53), for the three months ended June 30, 2025. Research and development (R&D) expenses for the three months ended June 30, 2026 were $24.1 million, compared with $14.0 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 June 30, 2026 was $0.7 million, compared with $0.6 million for the same period of 2025. General and administrative (G&A) expenses was flat at $5.6 million each for the three months ended June 30, 2026 and June 30, 2025. Total G&A stock-based compensation expense incurred for the three months ended June 30, 2026 was $0.7 million, compared with $0.5 million for the same period of 2025. Interest and other income, net, was income of $0.2 million for the three months ended June 30, 2026 compared with income of $1.2 million for the same period in 2025. Change in fair value of 2023 common warrants for the three months ended June 30, 2026, was income of $3.0 million compared with income of $1.7 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. 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 timing of data readouts for the pevifoscorvir sodium B-SUPREME study; potential success of the Company’s development programs, including timing of the Company’s anticipated ASO clinical trials; the potential for ALG-170675 to reduce ASO toxicity and improve ASO liver to kidney ratios; the potential additive to synergistic effects of ALG-170675 when combined with a CAM-E; statements about the Company’s plans to conduct a Phase 2 study on ALG-170675 in 2028, and whether it may include combination therapy (e.g. pevifoscorvir sodium); 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 the ASO and/or pevifoscorvir sodium in Greater China, including statements regarding timing and design of Amoytop’s anticipated clinical trials; 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, reliance on collaborators to succeed in their development efforts and to comply with their contractual obligations, 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 August 6, 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 ContactJordyn TaraziVice President, Investor Relations & Corporate Communications+1 (650) [email protected] _____________________________________________ (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.

SOUTH SAN FRANCISCO, Calif., July 30, 2026 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS), a clinical stage biotechnology company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced that it will report the Company’s second quarter 2026 financial results on Thursday, August 6, 2026, before the open of the U.S. financial markets. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biopharmaceutical 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 with high unmet medical needs such as chronic hepatitis B virus (HBV) infection. 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 regarding Aligos’ mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Such forward-looking statements are subject to substantial risks and uncertainties that could cause actual results 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 and the regulatory approval processes. 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. CompanyJordyn TaraziVice President, Investor Relations & Corporate Communications(650) [email protected]

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. 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 [email protected] _____________________________________________ (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.

SOUTH SAN FRANCISCO, Calif., April 30, 2026 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS), a clinical stage biotechnology company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced that it will report the Company’s first quarter 2026 financial results on Thursday, May 7, 2026, after the close of the U.S. financial markets. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biopharmaceutical 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 with 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 regarding Aligos’ mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Such forward-looking statements are subject to substantial risks and uncertainties that could cause actual results 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 and the regulatory approval processes. 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’ 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. Company Jordyn Tarazi Vice President, Investor Relations & Corporate Communications (650) 910-0427 [email protected]

Received FDA Fast Track Designation for pevifoscorvir sodium for the treatment of chronic hepatitis B virus infection HBeAg- cohort sample size increased to optimize powering; futility criteria not met Study drugs were well-tolerated by participants Topline data expected in 2027, guidance remains unchanged SOUTH SAN FRANCISCO, Calif., April 14, 2026 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS, “Aligos”) a clinical stage biopharmaceutical company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced the first interim analysis results of the Phase 2 B-SUPREME study of pevifoscorvir sodium in participants with chronic hepatitis B virus (HBV) infection for the Part 2a (HBeAg- cohort) where the independent Data Safety Monitoring Review Board (DSMB) has recommended continuation of the study with an increase in sample size for this cohort in order to optimize statistical powering; futility criteria for the cohort was not met. Additionally, Aligos announced that the United States Food and Drug Administration (FDA) has granted Fast Track Designation to pevifoscorvir sodium, a potential best/first-in-class capsid assembly modulator (CAM-E) under investigation for the treatment of chronic hepatitis B virus (HBV) infection. Interim Analysis 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 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 was 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. Aligos remains blinded to participant-level data. Completion of enrollment in the HBeAg- cohort is expected in the second half of 2026. Currently, there are 74 participants enrolled in the HBeAg- cohort (Part 2a), with 103 participants enrolled in the HBeAg+ cohort (Part 1a). Topline data remains on track for 2027. “We are encouraged by this recommendation from the DSMB to increase the sample size in order to increase the probability for success of the study’s primary endpoint,” stated Lawrence Blatt, Ph.D., M.B.A., Chairman, President, and Chief Executive Officer at Aligos Therapeutics. “We believe we can enroll the necessary study participants in the coming months, with topline data on track for 2027. Additionally, I am thrilled to share that pevifoscorvir sodium has been granted Fast Track Designation. Aligos’ mission since its founding has been to improve outcomes for patients with unmet needs in liver and viral diseases and being granted Fast Track Designation for pevifoscorvir sodium is the next step in our journey to make this a reality. As we progress the Phase 2 B-SUPREME study, we look forward to working with regulators to determine the appropriate path forward.” Fast Track Designation The FDA Fast Track Designation was supported by the 96-Week Phase 1 (NCT04536337) data evaluating pevifoscorvir sodium monotherapy in patients with chronic HBV infection, which were presented at The Liver Meeting® 2025, along with the 8-Week nucleoside analog follow-up data. This study demonstrated that pevifoscorvir sodium was well tolerated by study participants and the data demonstrated potential best-in-class reductions across clinically relevant viral markers. Fast Track Designation is a process designed to facilitate the development and expedite the review of drugs to treat serious conditions and fill an unmet medical need. It enables more frequent meetings and communication with the FDA to ensure alignment on development plans and the collection of clinical data needed to support approval. Furthermore, clinical programs with Fast Track Designation may be eligible for Rolling Review, Accelerated Approval and Priority Review if relevant criteria are met. For conditions where an available treatment exists, a drug candidate must show some advantage over available therapy, such as superior effectiveness, to be granted Fast Track Designation1. About B-SUPREME The Phase 2 B-SUPREME study (NCT06963710) is a randomized, double-blind, active-controlled multicenter study evaluating the safety and efficacy of pevifoscorvir sodium monotherapy compared with tenofovir disoproxil fumarate in approximately 200 untreated HBeAg+ and HBeAg- adult subjects with chronic HBV infection for 48 weeks. The primary endpoint in the HBeAg+ part is HBV DNA <LLOQ (10 IU/mL, target detected [TD] or target not detected [TND]) and the primary endpoint in the HBeAg- part is HBV DNA <LLOQ (10 IU/mL, target not detected [TND]). The study will also evaluate the safety, pharmacokinetics, and other secondary and exploratory biomarkers, including reductions in HBV antigens and other markers of HBV infection. The second interim analysis is expected in the second half of 2026 and topline data is expected in 2027. About pevifoscorvir sodium Pevifoscorvir sodium (formerly known as ALG-000184) was derived from initial IP licensed from the laboratory of Dr. Raymond Schinazi at Emory University, which was further optimized by Aligos. Pevifoscorvir sodium is a potent potential best/first-in-class oral small molecule capsid assembly modulator (CAM-E) being developed for chronic hepatitis B virus (HBV) infection. Phase 1 studies have demonstrated after single and multiple daily doses that pevifoscorvir sodium was well-tolerated by study participants, with no safety signals observed, and demonstrated linear PK and promising antiviral activity. In longer term Phase 1 studies, pevifoscorvir sodium 300mg QD x ≤96 weeks monotherapy has demonstrated sustained reductions in HBV DNA, RNA, HBsAg, HBeAg, and HBcrAg. Pevifoscorvir sodium has a regulatory path, as acknowledged by the FDA, EMA, and NMPA (China), for subsequent studies utilizing the chronic suppressive pathway. About Chronic HBV Infection Chronic hepatitis B virus (HBV) infection is a life-threatening viral infection that primarily affects the liver with 254 million patients worldwide and approximately 1.2 million individuals become newly infected every year despite the availability of a prophylactic vaccine. Complications include cirrhosis, end-stage liver disease, and hepatocellular carcinoma, which collectively resulted in approximately 1.08 million deaths in 2022, according to the European Association for the Study of the Liver’s 2025 clinical practice guidelines. Chronic HBV infection is the primary cause of liver cancer worldwide, and the mortality associated with HBV-related liver cancer continues to increase. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biopharmaceutical 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 with 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 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’ mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases; the expected pace of enrollment in the B-SUPREME study, timing for enrollment completion, expectations for second interim analysis in the second half of 2026, and expectations for topline data in 2027; whether the planned increase in enrollment will lead to success in meeting the study’s primary endpoint; expectations regarding what the B-SUPREME study will evaluate in the future; and whether the granting of Fast Track Designation by the FDA for pevifoscorvir sodium will lead to improved outcomes for patients with unmet needs in liver and viral diseases. Such forward-looking statements are subject to substantial risks and uncertainties that could cause actual results 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 and the regulatory approval processes. 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’ 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. Aligos Therapeutics Contact Jordyn Tarazi Vice President, Investor Relations & Corporate Communications +1 (650) 910-0427 [email protected] Media Contact Inizio Evoke Jake Robison Vice President [email protected]

SOUTH SAN FRANCISCO, Calif., March 05, 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 fourth quarter and full year 2025. “Our team has made tremendous progress recently in the global Phase 2 B-SUPREME study of pevifoscorvir sodium,” stated Lawrence Blatt, Ph.D., M.B.A., Chairman, President, and Chief Executive Officer of Aligos Therapeutics. “With the completion of the planned enrollment in the HBeAg- cohort, we are continuing to enroll participants in the HBeAg+ cohort and look forward to the interim analyses in the first and second half of 2026. Additionally, the Phase 2 B-SUPREME study may demonstrate that pevifoscorvir sodium affects the three pillars of HBV disease pathogenesis: replication, integration, and maintenance of the viral reservoir. We are also excited to announce the advancement, in partnership with Xiamen Amoytop Biotech Co., Ltd. (“Amoytop”), of ALG-170675, a dual mechanism antisense oligonucleotide (ASO) into IND-enabling studies. Lastly, adding James Hassard as Executive Vice President, Chief Commercial Officer has allowed us to begin laying the groundwork for the future of our best-in-class programs.” Recent Business Progress Pipeline Updates Pevifoscorvir sodium: Potential first-/best-in-class small molecule CAM-E for chronic hepatitis B virus (HBV) infection The Phase 2 B-SUPREME study (NCT06963710) of pevifoscorvir sodium in subjects with chronic HBV infection completed the planned enrollment of 60 HBeAg- participants in January 2026. HBeAg+ participants continue to enroll in the study. The first protocol defined interim analysis includes approximately 60% (or 36) HBeAg- participants that complete 12 weeks of the treatment period, with this enrollment threshold reached in Q4 2025. A second protocol defined interim analysis is planned when approximately 50% (or 55) HBeAg+ participants complete 24 weeks of the treatment period, with this enrollment threshold reached in January 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 post-treatment data expected to be presented at upcoming scientific meetings. ALG-170675: Potential best-in-class antisense oligonucleotide (ASO) for chronic hepatitis B virus (HBV) infection Along with our partner Xiamen Amoytop Biotech Co., Ltd. (Amoytop), ALG-170675 was recently selected to proceed into IND-enabling studies. Current costs for development in China are being funded by Amoytop, who maintain rights in China, Taiwan, Hong Kong and Macau. This next-generation ASO works via two mechanisms of action. It targets and destroys HBsAg mRNA and activates the immune response through TLR-8 agonism. ALG-055009: Potential best-in-class small molecule THR-β for obesity, MASH Recently presented in vivo data in diet induced obese (DIO) mice treated with semaglutide (SEMA), tirzepatide (TIRZEP), or a combination of ALG-055009 and SEMA or TIRZEP for 28 days demonstrated synergistic weight loss in the combination groups compared to monotherapy groups. SEMA monotherapy resulted in a maximum of 23.9 ±2.6% body weight loss, while the combination of SEMA and ALG-055009 had an additional 8.6% decrease for a maximum 33% body weight loss. The low and high doses of TIRZEP led to a maxima of 27.1 ±2.7% and 34.4 ±1.6% body weight loss, respectively. Combination of TIRZEP (low) or TIRZEP (high) with ALG-055009 induced an additional 11.7% and 5.8% decrease for a maximum of 39% and 40% body weight loss respectively. Furthermore, the additional weight loss in the combination therapy of either incretin receptor agonist and ALG-055009 was mainly due to additional loss of fat mass, with no significant effect on lean mass or food consumption as compared to incretin receptor agonist monotherapy. The data suggest the potential for a significant benefit of adding ALG-055009 to an incretin receptor agonist therapy for weight loss, especially in combination with a low-dose of a potent incretin receptor agonist, such as tirzepatide. Evaluation of a variety of options to fund continued development, including potential out-licensing is ongoing. Business Updates James Hassard was appointed Executive Vice President, Chief Commercial Officer to build the Company’s global commercial capabilities. Financial Results for the Fourth Quarter and Full Year 2025 Cash, cash equivalents and investments totaled $77.8 million as of December 31, 2025, compared with $56.9 million as of December 31, 2024. Our cash, cash equivalents and investments are expected to provide sufficient funding of planned operations into the third quarter of 2026. Net loss for the three months ended December 31, 2025 was $19.9 million or basic and diluted net loss per common share of $(1.91), compared to net loss of $82.2 million or basic and diluted net loss per common share of $(13.08) for the three months ended December 31, 2024. Net loss for the year ended December 31, 2025 was $24.2 million or basic and diluted net loss per common share of $(2.45), compared to net loss of $131.2 million or basic and diluted net loss per common share of $(20.94) for the year ended December 31, 2024. Research and development (R&D) expenses for the three months ended December 31, 2025 were $17.0 million, compared with $16.0 million for the same period of 2024. 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 December 31, 2025 was $0.7 million, compared with $1.0 million for the same period of 2024. R&D expenses for the year ended December 31, 2025 were $69.5 million, compared with $70.3 million for the same period of 2024. The decrease was due to increased government funds received for the coronavirus program which offset related costs. General and administrative (G&A) expenses for the three months ended December 31, 2025 were $4.9 million, compared with $5.2 million for the same period of 2024. 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 December 31, 2025 was $0.6 million, compared with $0.7 million for the same period of 2024. G&A expenses for the year ended December 31, 2024 were $20.7 million, compared with $22.8 million for the same period of 2024. The decrease in G&A expenses for this comparative period is primarily due to a decrease in third party expenses including legal expenses. Interest and other income, net, for the three months ended December 31, 2025 was income of $0.8 million compared with income of $0.6 million for the same period in 2024. Interest and other income, net, for the year ended December 31, 2025 was income of $3.9 million compared with income of $4.4 million for the same period of 2024. Change in fair value of 2023 common warrants for the three months ended December 31, 2025, was income of $1.2 million compared with a loss of $62.1 million for the same period of 2024. Change in fair value of common warrants for the year ended December 31, 2025, was income of $60.2 million compared with a loss of $46.1 million for the same period of 2024. 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, obesity, metabolic dysfunction-associated steatohepatitis (MASH), 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, data presentations and data readouts for pevifoscorvir sodium; the expected data presentations for ALG-055009; potential success of the Company’s development programs including with respect to ALG-170675; and the company’s expectation that its cash, cash equivalents and investments provide sufficient funding of planned operations into the third 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 filed with the Securities and Exchange Commission on November 6, 2025 and Aligos’ Annual Report on Form 10-K to be 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 [email protected] _____________________________________________ (1) The condensed consolidated balance sheet as of December 31, 2024 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, 2024.

SOUTH SAN FRANCISCO, Calif., Feb. 26, 2026 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS), a clinical stage biotechnology company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced that it will report the Company’s fourth quarter 2025 financial results on Thursday, March 5, 2026, before the open of the U.S. financial markets. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biopharmaceutical 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 with 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 regarding Aligos’ mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Such forward-looking statements are subject to substantial risks and uncertainties that could cause actual results 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 and the regulatory approval processes. 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 November 6, 2025 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. Company Jordyn Tarazi Vice President, Investor Relations & Corporate Communications (650) 910-0427 [email protected]

SOUTH SAN FRANCISCO, Calif., Nov. 06, 2025 (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 third quarter 2025. “Our Phase 2 B-SUPREME study of pevifoscorvir sodium (pevy) is enrolling nicely, with subjects dosed across a number of countries, including the U.S., China, Hong Kong, and Canada,” stated Lawrence Blatt, Ph.D., M.B.A., Chairman, President, and Chief Executive Officer of Aligos Therapeutics. “We are pleased with the progress to date and look forward to interim readouts in 2026. Importantly, we look forward to sharing additional pevy data next week at AASLD’s The Liver Meeting®. We maintain our enthusiasm regarding the potential for pevy as well as our entire development pipeline, including ALG-055009, which is in continued discussions with potential partners for obesity and MASH.” Recent Business Progress Pipeline Updates Pevifoscorvir sodium: Potential first-/best-in-class small molecule CAM-E for chronic hepatitis B virus (HBV) infection The Phase 2 B-SUPREME study (NCT06963710) of pevifoscorvir sodium in subjects with chronic HBV infection dosed its first patient in August 2025. The study is designed as a randomized, double-blind, active-controlled multicenter study evaluating the safety and efficacy of pevifoscorvir sodium monotherapy compared with tenofovir disoproxil fumarate in approximately 200 untreated HBeAg+ or HBeAg- adult subjects with chronic HBV infection for 48 weeks. The primary endpoint in the HBeAg+ subjects is HBV DNA <LLOQ (10 IU/mL, target detected [TD] or target not detected [TND]) and the primary endpoint in the HBeAg- subjects is HBV DNA <LLOQ (10 IU/mL, target not detected [TND]). The study is also evaluating safety, pharmacokinetics, and other secondary and exploratory HBV biomarkers, including reductions in HBV antigens and other markers of HBV infection. Interim data are projected in 1H and 2H 2026 and topline data are anticipated in 2027. 96-weeks of dosing have been completed in the Phase 1 study (NCT04536337) and data readouts, including post-treatment data, will be presented at The Liver Meeting® 2025 in November 2025. Eight abstracts were accepted for presentation (four for pevifoscorvir sodium), including one oral presentation on the Phase 1 monotherapy study of pevifoscorvir sodium. ALG-055009: Potential best-in-class small molecule THR-β for obesity, MASH THR-β agonists under investigation from other companies have demonstrated significant enhancement in weight loss when administered in combination with incretin receptor agonists (RAs) for the treatment of obesity. Recently generated preclinical data combining ALG-055009 with incretin RAs in a diet-induced obese (DIO) mouse model exhibited profound synergistic effects in body weight loss when used in combination with semaglutide or tirzepatide. The combination therapy also demonstrated enhanced antihyperlipidemic effects as compared to monotherapy. These data are expected to be presented at a future scientific conference. Evaluation of a variety of options to fund continued development, including potential out-licensing is ongoing. Financial Results for the Third Quarter 2025 Cash, cash equivalents and investments totaled $99.1 million as of September 30, 2025, compared with $56.9 million as of December 31, 2024. Our cash, cash equivalents and investments are expected to provide sufficient funding of planned operations into the third quarter of 2026. Net loss for the three months ended September 30, 2025 was $31.5 million or basic and diluted net loss per common share of $(3.04), compared to net loss of $19.3 million or basic and diluted net loss per common share of $(3.07) for the three months ended September 30, 2024. Research and development (R&D) expenses for the three months ended September 30, 2025 were $23.9 million, compared with $16.8 million for the same period of 2024. The increase was primarily due to an increase in third-party expenses for the pevifoscorvir sodium Phase 2a clinical trial. Total R&D stock-based compensation expense incurred for the three months ended September 30, 2025 was $0.8 million, compared with $1.2 million for the same period of 2024. General and administrative (G&A) expenses for the three months ended September 30, 2025 were $5.2 million, compared with $4.6 million for the same period of 2024. The increase in G&A expenses for this comparative period is primarily due to an increase in legal and other related expenses. Total G&A stock-based compensation expense incurred for the three months ended September 30, 2025 was $0.7 million, compared with $0.9 million for the same period of 2024. Interest and other income, net, was income of $1.1 million for each of the three months ended September 30, 2025 and September 30, 2024. Change in fair value of 2023 common warrants for the three months ended September 30, 2025 was a loss of $4.2 million compared with a loss of $0.1 million for the same period of 2024. 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, obesity, metabolic dysfunction-associated steatohepatitis (MASH), 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, data presentations and data readouts for pevifoscorvir sodium; the expected data presentations for ALG-055009; the potential funding and out-licensing of ALG-055009; and the company’s expectation that its cash, cash equivalents and investments provide sufficient funding of planned operations into the third 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 filed with the Securities and Exchange Commission on November 6, 2025 and Aligos’ Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 10, 2025 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 [email protected] ___________________________ (1) The condensed consolidated balance sheet as of December 31, 2024 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, 2024.

SOUTH SAN FRANCISCO, Calif., Oct. 30, 2025 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS), a clinical stage biotechnology company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced that it will report the Company’s third quarter 2025 financial results on Thursday, November 6, 2025, before the open of the U.S. financial markets. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biopharmaceutical 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 with high unmet medical needs such as chronic hepatitis B virus (HBV) infection, obesity, metabolic dysfunction-associated steatohepatitis (MASH), 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 regarding Aligos’ mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Such forward-looking statements are subject to substantial risks and uncertainties that could cause actual results 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 and the regulatory approval processes. 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 August 6, 2025 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. Company Jordyn Tarazi Vice President, Investor Relations & Corporate Communications (650) 910-0427 [email protected]

SOUTH SAN FRANCISCO, Calif., Aug. 06, 2025 (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 second quarter 2025. “Initiation of the Phase 2 B-SUPREME study of ALG-000184 is well underway with regulatory approvals across a number of countries, including the US, China, Canada, Taiwan, UK, New Zealand, and Moldova,” stated Lawrence Blatt, Ph.D., M.B.A., Chairman, President, and Chief Executive Officer of Aligos Therapeutics. “Site activations are in progress, subjects are being screened, and we expect dosing to commence in the coming weeks. This pertinent study is the next step in our journey to potentially deliver better therapies for patients living with HBV infection and create value for our stakeholders. The Phase 1 data showcasing 96 weeks of treatment presented at the EASL meeting suggests that ALG-000184 has the potential to replace standard of care treatment for chronic suppression of HBV infection and may become the backbone of treatments aimed at a functional cure. We remain excited about the potential of ALG-000184 and the entirety of our pipeline, including ALG-055009 which remains in discussions with potential partners.” Recent Business Progress Pipeline Updates ALG-000184: Potential first-/best-in-class small molecule CAM-E for chronic hepatitis B virus (HBV) infection The Phase 2 B-SUPREME study (NCT04746183) of ALG-000184 in subjects with chronic HBV infection recently began obtaining regulatory approvals, activating global sites, and screening subjects. Dosing is expected to commence in the coming weeks. The study is designed as a randomized, double-blind, active-controlled multicenter study evaluating the safety and efficacy of ALG-000184 monotherapy compared with tenofovir disoproxil fumarate in approximately 200 untreated HBeAg+ and HBeAg- adult subjects with chronic HBV infection for 48 weeks. The primary endpoint in the HBeAg+ part will be HBV DNA <LLOQ (10 IU/mL, target detected [TD] or target not detected [TND]) and the primary endpoint in the HBeAg- part will be HBV DNA <LLOQ (10 IU/mL, target not detected [TND]). The study is also evaluating the safety, pharmacokinetics, and other secondary and exploratory biomarkers, including reductions in HBV antigens and other markers of HBV infection. The company expects to announce interim data in 2026, and topline data in 2027. 96-week dosing recently completed in the Phase 1 study and data readouts, including post-treatment data, are planned for scientific conferences this year. Interim data from up to 96 weeks following an oral daily dose of 300 mg ALG-000184 in both HBeAg+ and HBeAg- subjects with chronic HBV infection were presented at the European Association for the Study of the Liver (EASL) Congress 2025. ALG-000184 administered for up to 96 weeks was well tolerated by study participants, exhibited a favorable PK profile, and suggested potentially best-in-class antiviral activity. In HBeAg+ subjects with a very high mean HBV DNA level of 8.0 log10 IU/mL at baseline, all experienced profound and persistent HBV DNA reductions after receiving an oral daily dose of 300 mg ALG-000184 monotherapy. At Week 48, 6 of 10 subjects (60%) achieved HBV DNA < LLOQ (10 IU/mL, target detected or target not detected). With treatment extension, this rate increased to 9 of 9 subjects (100%) at Week 96. Additionally, HBV DNA level continuously declined to < LLOQ (10 IU/mL, target not detected) in 5 of 9 subjects at Week 96. In HBeAg- subjects, all 11 (100%) had rapid decline in HBV DNA levels and achieved sustained HBV DNA suppression (HBV DNA < LLOQ (10 IU/mL, target detected or target not detected)) by Week 24. The HBV DNA suppression level was maintained in the ALG-000184 monotherapy cohort for up to 96 weeks, with further decline in HBV DNA to < LLOQ (10 IU/mL, target not detected), observed in all subjects (8/8) at Week 96. Multi-log10 reductions in HBsAg, HBeAg, and HBcrAg were observed in HBeAg+ subjects, and HBcrAg decline was observed in HBeAg- subjects. In both patient populations in this study, ALG-000184 was well tolerated with no viral breakthrough observed and no known CAM resistant mutations identified with monotherapy treatment. ALG-055009: Potential best-in-class small molecule THR-β agonist for metabolic dysfunction-associated steatohepatitis (MASH) The Phase 2a HERALD data were presented at EASL 2025, demonstrating that ALG-055009 dose groups met the primary endpoint with statistically significant reductions in liver fat at week 12 as measured by MRI-PDFF. Additionally, new data demonstrated substantial, dose-dependent reductions in liver fat were observed across all key subgroups with 12 weeks of once daily ALG-055009 treatment. Statistically significant improvements in atherogenic lipids were achieved with 12 weeks of ALG-055009 treatment. Reductions in lipids/lipoproteins were observed even in the context of stable GLP-1 agonist or statin use. This data suggests a potential added benefit of ALG-055009 for patients at risk for cardiovascular disease in addition to the previously reported liver fat lowering properties in a MASLD/MASH population. As shared previously, ALG-055009 demonstrated a favorable tolerability profile with no evidence of clinical hyper/hypothyroidism. Incidence of gastrointestinal-related treatment emergent adverse events were similar in ALG-055009 dose groups compared to placebo. Specifically, similar rates of diarrhea were observed in ALG-055009 dose groups compared to placebo, with no dose-response. Significant reductions in atherogenic lipids, including LDL-C, lipoprotein (a), and apolipoprotein B, were also observed (Loomba et al, AASLD 2024). The company is continuing to evaluate a variety of options to fund continued development, including potential out-licensing. ALG-097558: Potential best-in-class ritonavir-free small molecule pan-coronavirus protease inhibitor The AGILE platform study (NCT04746183) assessing ALG-097558 monotherapy or in combination with remdesivir in high-risk subjects with COVID-19 began in 2024. The NIAID is sponsoring a drug-drug interaction and relative bioavailability study of ALG-097558 in healthy volunteers that began dosing in the second quarter of 2025. The company expects any future development of ALG-097558 to be funded by external sources. Financial Results for the Second Quarter 2025 Cash, cash equivalents and investments totaled $122.9 million as of June 30, 2025, compared with $56.9 million as of December 31, 2024. Our cash, cash equivalents and investments are expected to provide sufficient funding of planned operations into the second half of 2026. Net loss for the three months ended June 30, 2025 was $15.9 million or basic and diluted net loss per common share of $(1.53), compared to net income of $5.1 million or basic and diluted net income per common share of $0.81 for the three months ended June 30, 2024. Research and development (R&D) expenses for the three months ended June 30, 2025 were $14.0 million, compared with $21.1 million for the same period of 2024. The decrease was primarily due to a decrease in third-party expenses due to reduced clinical study costs as a result of the completion of the MASH Phase 2a clinical trial, partially offset by increased spend in the chronic HBV infection program. Total R&D stock-based compensation expense incurred for the three months ended June 30, 2025 was $0.6 million, compared with $1.2 million for the same period of 2024. General and administrative (G&A) expenses for the three months ended June 30, 2025 were $5.6 million, compared with $6.4 million for the same period of 2024. The decrease in G&A expenses for this comparative period is primarily due to a decrease in third-party expenses including legal expenses. Total G&A stock-based compensation expense incurred for the three months ended June 30, 2025 was $0.5 million, compared with $0.9 million for the same period of 2024. Interest and other income, net, was income of $1.2 million each for the three months ended June 30, 2025 and June 30, 2024. Change in fair value of 2023 common warrants for the three months ended June 30, 2025 was income of $1.7 million compared with income of $30.4 million for the same period of 2024. 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), 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 enrollment of Phase 2 participants for ALG-000184; the potential impact of ALG-000184 on patient populations, stakeholder value, and treatment therapies; the planned data releases, data readouts at scientific conferences, and primary endpoints for ALG-000184; the potential additional benefits and out-licensing of ALG-055009; the expectations regarding funding for ALG-097558; and the company’s expectation that its cash, cash equivalents and investments provide sufficient funding of planned operations into the second half 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 filed with the Securities and Exchange Commission on August 6, 2025 and Aligos’ Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 10, 2025 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 [email protected] _____________________________________________

SOUTH SAN FRANCISCO, Calif., July 30, 2025 (GLOBE NEWSWIRE) -- Aligos Therapeutics, Inc. (Nasdaq: ALGS), a clinical stage biotechnology company focused on improving patient outcomes through best-in-class therapies for liver and viral diseases, today announced that it will report the Company’s second quarter 2025 financial results on Wednesday, August 6, 2025, after the close of the U.S. financial markets. About Aligos Aligos Therapeutics, Inc. (NASDAQ: ALGS) is a clinical stage biopharmaceutical 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 with high unmet medical needs such as chronic hepatitis B virus (HBV) infection, metabolic dysfunction-associated steatohepatitis (MASH), 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 regarding Aligos’ mission to improve patient outcomes by developing best-in-class therapies for the treatment of liver and viral diseases. Such forward-looking statements are subject to substantial risks and uncertainties that could cause actual results 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 and the regulatory approval processes. 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 6, 2025 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. Company Jordyn Tarazi Vice President, Investor Relations & Corporate Communications (650) 910-0427 [email protected]