Aligos Therapeutics, Inc. Revenue Disclosure

10. Revenue from contracts with customers

Agreement with Amoytop

In May 2023, the Company and Amoytop Biotech Co., Ltd (Amoytop) entered into a Research Collaboration and Development Agreement (the Amoytop Agreement) with a focus on nucleic acid technology for HBV treatment, with the Company granting to Amoytop an exclusive, time-limited option to enter into an exclusive, territory-limited license to develop and commercialize such compounds. Under the terms of the agreement, the Company received an upfront payment of $7.0 million, less withholding taxes of $1.1 million from Amoytop. With respect to the agreement, the Company is eligible for up to $109.0 million in development and commercialization milestones as well as tiered royalties on net sales. These potential payments consist of (i) potential development milestones (such as for the commencement of a Good Laboratory Practice toxicology study for a collaboration compound, approval of IND by regulatory authority, initiation of Phase 2 and 3 clinical trials, and regulatory approval of a licensed product), and (ii) sales-based milestones.

In May 2024, the Company and Amoytop entered into an extension to the Amoytop Agreement, covering work performed through January 2025. Under the terms of the agreement, the Company received an upfront payment of $1.5 million, which was recognized from the second quarter of 2024 through the first quarter of 2025.

In May 2025, the Company and Amoytop entered into an additional extension to the Amoytop Agreement, covering work performed through approximately November 2025. Under the terms of the agreement, the Company received an upfront payment of $1.0 million, which was recognized from the second quarter of 2025 through the fourth quarter of 2025.

In September 2025, Amoytop exercised its option to obtain an exclusive, territory-limited license to one compound developed under the Amoytop Agreement, with the right to choose such compound among four identified candidates following the completion of the work outlined in the May 2025 extension. IND-enabling studies began on its chosen compound in January 2026, which earned the Company a milestone payment of $3.0 million.

The Company determined that the Amoytop agreement falls within the scope of ASC 606. The agreement did not fall under the ASC 808 guidance due to Amoytop and the Company not being joint active participants, and both parties not having significant risks and rewards. Management of the Company determined that there were three performance obligations for the agreement given the deliverables are distinct. The Company evaluated the standalone selling price for each obligation based on available data for similar arrangements. The Company evaluated the performance obligations and determined the provision of R&D services for the collaboration compound performance obligation will be satisfied over time, the research license including data and know-how has been satisfied, and the provision of materials will be satisfied upon delivery. Given the nature of the arrangement, the Company believes that the satisfaction of its performance obligations is best measured by the progress of its efforts as it relates to the performance of the R&D services. As such, the Company has used an input method based on costs incurred to recognize revenue associated with the upfront payments, and the Company recognizes revenue over time based on the costs incurred. The effect of any updates to the estimated overall costs are recorded as a change in estimate. In addition, variable consideration (e.g., milestone payments) were evaluated based on the Company’s analysis that the probability of achieving any of the milestone payments is remote, and therefore determined to be constrained and excluded from the transaction price.

During the years ended December 31, 2025 and 2024, the Company recognized $2.2 million and $3.6 million, respectively, in revenue from customers related to upfront payments. During the years ended December 31, 2025 and 2024, the Company recognized no revenue from customers related to milestone payments. The unrecognized portion of the upfront payments received during the twelve months ended December 31, 2025 and 2024 is recorded on the Consolidated Balance Sheets as “Deferred revenue, current”.

Agreement with ADCT

The Company determined that the ADC Therapeutics (ADCT) agreement falls within the scope of ASC 606. The agreement did not fall under the ASC 808 guidance due to ADCT and the Company not being joint active participants, nor both parties having significant risks and rewards. Management of the Company determined that there was one performance obligation for the agreement given the deliverables are not distinct. The Company evaluated the performance obligation and determined the performance obligations are satisfied over time. Given the nature of the arrangement, the Company believes that the satisfaction of its performance obligations is best measured by the progress of its efforts. As such, the Company has used an input method based on costs incurred to recognize revenue associated with the upfront payments, and the Company recognizes revenue over time based on the costs incurred. The effect of any updates to the estimated overall costs are recorded as a change in estimate. In addition, variable consideration (e.g., milestone payments) were evaluated based on the Company’s analysis that the

possibility of achieving any of the milestone payments is remote, and therefore determined to be constrained and excluded from the transaction price. Similarly, the Company accounts for the future royalties under the sales-based royalty exception in ASC 606-10-55-65 through 55-65B therefore they are not considered in the transaction price and expected to be recognized when future sales occur since that is expected to occur after the performance obligation has been fully satisfied.