MetaVia Reports First Quarter 2025 Financial Results and Provides Corporate Update Announced Positive Top-Line Phase 1 MAD Trial Results for DA-1726 in Obesity, Demonstrating Compelling Weight Loss and Best-in-Class Pote

MetaVia Reports First Quarter 2025 Financial Results

and Provides Corporate Update

Announced Positive Top-Line Phase 1 MAD Trial Results for DA-1726 in Obesity, Demonstrating Compelling Weight Loss and Best-in-Class Potential for Glucose Control, Waist Reduction and Tolerability

Additional Cohorts Planned to Determine Maximum Tolerated Dose of DA-1726

Successfully Completed a Private Placement Resulting in $10 Million in Gross Proceeds

$11.2 Million in Cash at End of First Quarter, With the Additional $10.0 Million From the Private Placement, is Expected to Fund the Company Into 2026

CAMBRIDGE, Mass., May 14, 2025 - MetaVia Inc. (Nasdaq: MTVA), a clinical-stage biotechnology company focused on transforming cardiometabolic diseases, today announced financial results for the first quarter ended March 31, 2025, and provided a corporate strategic update.

"In the first quarter and beyond, we achieved significant progress advancing the clinical development of our two next-generation cardiometabolic assets, highlighted by the positive results from Part 2 of the multiple ascending dose (MAD) Phase 1 trial of DA-1726, a novel, dual oxyntomodulin (OXM) analog agonist that functions as a glucagon-like peptide-1 receptor (GLP1R) and glucagon receptor (GCGR) for the treatment of obesity," stated Hyung Heon Kim, President and Chief Executive Officer of MetaVia. "We are now well capitalized into 2026 after a successful private placement of $10 million in aggregate gross proceeds. The data reinforce DA-1726's strong potential as a best-in-class therapy, demonstrating, without titration, a compelling safety and tolerability profile alongside dose-dependent weight loss, reaching a maximum reduction of 6.3% and a mean reduction of 4.3% at the 32 mg dose at Day 26 (p=0.0005). Additionally, at this dose, 83% of patients reported early satiety, and waist circumference decreased by an average of 1.6 inches and a maximum of 3.9 inches by Day 33, consistent with DA-1726's glucagon-driven effects on adipose tissue observed in preclinical models. The drug also achieved fasted glucose reductions of up to -18 mg/dL without hypoglycemic events, further underscoring its potential in obesity and related metabolic diseases. Cardiovascular safety remained favorable, with no QTcF prolongation and a decrease in mean heart rate across most cohorts, despite dual receptor agonism. Gastrointestinal side effects were mild, transient, and infrequent, suggesting a potentially superior tolerability profile compared to existing GLP-1 therapies."

"Building on these encouraging findings, we are initiating higher-dose cohorts to identify the maximum tolerated dose and further unlock DA-1726's full therapeutic potential. Our aim is to deliver a safe, effective and sustainable obesity treatment for patients across a broad range of comorbidities, consistent with guidance from the U.S. Food and Drug Administration (FDA)."

Mr. Kim continued, "This month, we presented compelling 16-week results, in a late-breaking poster, from our Phase 2a clinical trial of DA-1241, a novel G-Protein-Coupled Receptor 119 (GPR119) agonist, in patients with presumed metabolic dysfunction-associated steatohepatitis (MASH) at the European

Association for the Study of the Liver (EASL) Congress 2025. DA-1241 is the first oral GPR119 agonist to demonstrate both liver-protective and glucose-regulating effects. The data showed that DA-1241 significantly reduced markers of liver injury, inflammation, and fibrosis, improved non-invasive liver assessments, CAP and FAST scores, and enhanced glycemic control in patients with prediabetes or type 2 diabetes. It was well tolerated with a favorable safety profile. These findings suggest DA-1241's benefits extend beyond glycemic control, driven by its anti-inflammatory and anti-fibrotic mechanisms. We believe its novel mechanism of action supports further development as monotherapy or in combination for MASH and metabolic diseases, and we are exploring additional combination therapies. We look forward to discussing these findings with the FDA in the first half of 2025."

Fourth Quarter 2024 and Subsequent Highlights

Anticipated Clinical Milestones

First Quarter Financial and Operating Results

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 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 GLP1R agonists. 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. DA-1241 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, DA-1241 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, DA-1241 demonstrated direct hepatic action in addition to its glucose lowering effects.

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

Forward Looking Statements

Certain statements in this press release may be considered forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as "believes", "expects", "anticipates", "may", "will", "should", "seeks", "approximately", "potential", "intends", "projects", "plans", "estimates" or the negative of these words or other comparable terminology (as well as other words or expressions referencing future events, conditions or circumstances) are intended to identify forward-looking statements. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject to risks and uncertainties. Many factors could cause actual future events to differ materially from the forward-looking statements in this press release, including, without limitation, those risks associated with MetaVia's ability to execute on its commercial strategy; our expectations regarding the sufficiency of our existing cash on hand to fund our operations; the timeline for regulatory submissions; the ability to obtain regulatory approval through the development steps of MetaVia's current and future product candidates; the ability to realize the benefits of the license agreement with Dong-A ST Co. Ltd., including the impact on future financial and operating results of MetaVia; the cooperation of MetaVia's contract manufacturers, clinical study partners and others involved in the development of MetaVia's current and future product candidates; potential negative interactions between MetaVia's product candidates and any other products with which they are combined for treatment; MetaVia's ability to initiate and complete clinical trials on a timely basis; MetaVia's ability to recruit subjects for its clinical trials; whether MetaVia receives results from MetaVia's clinical trials that are consistent with the results of pre-clinical and previous clinical trials; impact of costs related to the license agreement, known and unknown, including costs of any litigation or regulatory actions relating to the license agreement; the effects of changes in applicable laws or regulations; the effects of changes to MetaVia's stock price on the terms of the license agreement and any future fundraising; and other risks and uncertainties described in MetaVia's filings with the Securities and Exchange Commission, including MetaVia's most recent Annual Report on Form 10-K and its subsequent Quarterly Reports on Form 10-Q. Forward-looking statements speak only as of the date when made. MetaVia does not assume any obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

Marshall H. Woodworth

Chief Financial Officer

Rx Communications Group

- Tables to Follow -

Consolidated Balance Sheets

(In thousands, except per share amounts)

Consolidated Statements of Operations

(Unaudited - In thousands, except share and per share amounts)