16-Week Study to Evaluate One-Step Dose Titration to 48 mg and Two-Step Dose Titration to 64 mg in Obese Otherwise Healthy Adults (Form 8-K)

16-Week Study to Evaluate One-Step Dose Titration to 48 mg and Two-Step Dose Titration to 64 mg in Obese Otherwise Healthy Adults

CAMBRIDGE, Mass., March 18, 2026 - MetaVia Inc. (Nasdaq: MTVA), a clinical-stage biotechnology company focused on transforming cardiometabolic diseases, today announced that the Institutional Review Board (IRB) at Clinical Pharmacology of Miami has approved the Company's Phase 1 Part 3 clinical trial of its lead asset, DA-1726, a novel, dual oxyntomodulin (OXM) analog targeting both GLP-1 (GLP1R) and glucagon (GCGR) receptors. The approval enables initiation of Part 3 of the Phase 1 program, which consists of two 16-week titration cohorts evaluating one-step and two-step dose-escalation strategies intended to safely reach higher target doses and further optimize tolerability.

The Phase 1 Part 3 trial will enroll a total of 40 obese, otherwise healthy adult subjects, across two parts, with 20 subjects per part, randomized 4:1 (16 active; 4 placebo). Part 3A is designed to evaluate a one-step titration regimen with 16 mg for 4 weeks followed by 48 mg for 12 weeks, while Part 3B will evaluate a two-step titration regimen with 16 mg for 4 weeks, 32 mg for 4 weeks, and 64 mg for 8 weeks. The study will assess safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of DA-1726. Primary endpoints include monitoring adverse events (AEs), serious adverse events (SAEs), treatment-emergent adverse events (TEAEs), and AEs leading to treatment discontinuation. Secondary and exploratory endpoints include PK profiling and evaluation of metabolic, glycemic, lipid, and body composition measures, including weight, waist circumference, and body mass index (BMI), and other cardiometabolic measures.

"This IRB approval marks a key milestone in the advancement of DA-1726 and builds on the program's increasingly compelling clinical profile across efficacy, safety, and tolerability," stated Hyung Heon Kim, President and Chief Executive Officer of MetaVia. "In earlier cohorts, the 48 mg dose produced approximately 9% weight loss, meaningful reductions in waist circumference, improved blood sugar control, and early signals of direct liver benefit, all with a favorable safety profile. Our upcoming 16-week titration studies to 48 mg and 64 mg doses are designed to build on these results and further highlight DA-1726's favorable tolerability and potential advantage relative to currently marketed therapies that require slower, more extended titration before achieving full therapeutic dosing. With initial dosing expected to begin in April and data expected in the fourth quarter of 2026, we believe these results will further de-risk the program and support advancement of DA-1726 into later-stage development, reinforcing its potential as a differentiated, next-generation GLP-1-based therapy that could offer meaningful advantages over existing options."

About DA-1726

DA-1726 is a novel oxyntomodulin (OXM) analogue functioning as a GLP1R/GCGR dual agonist for the treatment of obesity and Metabolic Dysfunction-Associated Steatohepatitis (MASH) that is to be administered once weekly subcutaneously. DA-1726 acts as a dual agonist of GLP-1 receptors (GLP1R) and glucagon receptors (GCGR), leading to weight loss through reduced appetite and increased energy expenditure. DA-1726 has a well understood mechanism and, in pre-clinical mice models, resulted in improved weight loss compared to semaglutide (Wegovy®), a leading GLP-1 receptor agonist. Additionally, in pre-clinical mouse models, DA-1726 elicited similar weight reduction, while consuming more food, compared to tirzepatide

(Zepbound®) and survodutide (a drug with the same MOA), while also preserving lean body mass and demonstrating improved lipid-lowering effects compared to survodutide. In the Phase 1 multiple ascending dose (MAD) trial in obesity, the 32 mg dose of DA-1726 demonstrated best-in-class potential for weight loss, glucose control, and waist circumference reduction.

About MetaVia

MetaVia Inc. is a clinical-stage biotechnology company focused on transforming cardiometabolic diseases. The company is currently developing DA-1726 for the treatment of obesity, and is developing vanoglipel (DA-1241) for the treatment of Metabolic Dysfunction-Associated Steatohepatitis (MASH). DA-1726 is a novel oxyntomodulin (OXM) analogue that functions as a glucagon-like peptide-1 receptor (GLP1R) and glucagon receptor (GCGR) dual agonist. OXM is a naturally-occurring gut hormone that activates GLP1R and GCGR, thereby decreasing food intake while increasing energy expenditure, thus potentially resulting in superior body weight loss compared to selective GLP-1 receptor agonists such as semaglutide. In a Phase 1 multiple ascending dose (MAD) trial in obesity, DA-1726 demonstrated best-in-class potential for weight loss, glucose control, and waist reduction. Vanoglipel is a novel G-protein-coupled receptor 119 (GPR119) agonist that promotes the release of key gut peptides GLP-1, GIP, and PYY. In pre-clinical studies, vanoglipel demonstrated a positive effect on liver inflammation, lipid metabolism, weight loss, and glucose metabolism, reducing hepatic steatosis, hepatic inflammation, and liver fibrosis, while also improving glucose control. In a Phase 2a clinical study, vanoglipel demonstrated direct hepatic action in addition to its glucose lowering effects.

For more information, please visit www.metaviatx.com.