Atea Pharmaceuticals to Present Three Abstracts at EASL 2026 Congress Highlighting Progress Across Viral Hepatitis Pipeline
Rhea-AI Summary
Atea Pharmaceuticals (Nasdaq: AVIR) will present three abstracts at the EASL 2026 Congress in Barcelona from May 27–30. Two posters cover clinical data on its fixed-dose combination of bemnifosbuvir and ruzasvir for hepatitis C, while a top poster highlights preclinical data for AT-587, Atea’s lead hepatitis E candidate.
AI-generated analysis. Not financial advice.
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News Market Reaction – AVIR
On the day this news was published, AVIR declined 16.91%, reflecting a significant negative market reaction. Argus tracked a trough of -16.7% from its starting point during tracking. Our momentum scanner triggered 23 alerts that day, indicating elevated trading interest and price volatility. This price movement removed approximately $82M from the company's valuation, bringing the market cap to $403.34M at that time. Trading volume was very high at 3.4x the daily average, suggesting heavy selling pressure.
Data tracked by StockTitan Argus on the day of publication.
Key Figures
Market Reality Check
Peers on Argus
AVIR was up 1.66% with slightly elevated volume. Peers showed mixed moves (e.g., OMER up 1.93%, CADL down 1.91%), and only one momentum-peer (LXEO up 3.33%) appeared, indicating a stock-specific move rather than a sector-wide rotation.
Historical Context
| Date | Event | Sentiment | Move | Catalyst |
|---|---|---|---|---|
| May 05 | Earnings call announcement | Neutral | -1.8% | Scheduled Q1 2026 results and business update call on May 12, 2026. |
| Mar 24 | Leadership change (peer) | Neutral | -4.3% | ReAlta Life Sciences announced new CEO and President/COO appointments. |
| Mar 05 | Earnings and pipeline update | Positive | +11.1% | Reported Q4/2025 results, C-BEYOND enrollment completion, strong cash of $301.8M. |
| Feb 26 | Earnings call announcement | Neutral | +1.3% | Set date for Q4 and full-year 2025 results and business update call. |
| Feb 24 | Preclinical HEV data | Positive | +1.3% | Presented potent preclinical AT-587 data for HEV at CROI 2026 with Phase 1 planned. |
Substantive clinical and financial updates (Phase 3 progress, AT-587 data, earnings) have generally seen aligned positive price reactions, while routine call announcements produced smaller, mixed moves but no clear divergence pattern.
Over the last six months, AVIR news has focused on advancing its HCV and HEV pipeline and regular financial updates. The Mar 5, 2026 earnings and business update, highlighting Phase 3 HCV progress and cash of $301.8M, coincided with a +11.13% move. Preclinical HEV data for AT-587 at CROI 2026 on Feb 24, 2026 also aligned with a positive reaction. Today’s EASL abstract acceptances continue this theme of steady clinical execution in viral hepatitis.
Market Pulse Summary
The stock dropped -16.9% in the session following this news. A negative reaction despite seemingly constructive news would contrast with prior aligned moves on pipeline progress, such as the +11.13% response to the March 2026 earnings and HCV update. Investors may reassess risk around the forthcoming HCV Phase 3 readouts or the HEV program’s transition into the clinic. Past filings highlight ongoing net losses and R&D intensity, factors that could amplify downside if sentiment weakens.
Key Terms
nucleotide analog polymerase inhibitor medical
ns5a inhibitor medical
proton-pump inhibitor medical
pharmacokinetics medical
p-gp medical
bcrp medical
oatp1b1/3 medical
top poster presentation technical
AI-generated analysis. Not financial advice.
BOSTON, May 13, 2026 (GLOBE NEWSWIRE) -- Atea Pharmaceuticals, Inc. (Nasdaq: AVIR) (Atea or Company), a late-stage clinical biopharmaceutical company engaged in the discovery and development of oral antiviral therapeutics for serious viral diseases, today announced that three abstracts have been accepted for presentation at the European Association for the Study of the Liver (EASL) Congress 2026, taking place May 27-30th in Barcelona, Spain.
The presentations include two posters supporting Atea’s fixed-dose combination regimen of bemnifosbuvir, a nucleotide analog polymerase inhibitor, and ruzasvir, an NS5A inhibitor, for the treatment of hepatitis C virus (HCV). Also being presented and designated as a top poster presentation is preclinical data for AT-587, a proprietary oral nucleotide analog recently selected as the Company’s lead clinical candidate for the treatment of hepatitis E virus (HEV).
Collectively, these presentations underscore Atea’s continued progress across its antiviral pipeline and highlight Atea’s focus on advancing potential new treatment options for patients with viral hepatitis.
“We look forward to sharing new clinical study results at EASL that further support the differentiated target profile of the regimen of bemnifosbuvir and ruzasvir for the treatment of HCV,” said Jean-Pierre Sommadossi, PhD, Chief Executive Officer and Founder of Atea. “As we approach topline results from our Phase 3 C-BEYOND and C-FORWARD trials, these data reinforce the regimen’s potential to deliver a best-in-class profile for patients living with HCV.”
“We’re also excited to highlight new preclinical data for AT-587, our lead clinical candidate for the treatment of HEV, which has earned designation as a top poster presentation,” added Dr. Sommadossi. “With no approved treatment options, HEV remains a significant, under-recognized disease, particularly among immunocompromised patients. We believe AT-587 has the potential to become a first-in-class therapy and look forward to advancing this program into the clinic mid-year as we expand our efforts to address serious viral infections.”
The accepted abstracts will be available on the EASL Congress 2026 website following the embargo lift on Wednesday, May 13th at 8:00 a.m. Central European Time (CET).
Poster Presentations at EASL 2026 Congress:
Poster ID: TOP-631
Title: Discovery and preclinical profile of a first-in-class potent hepatitis E virus inhibitor AT-587
Presenting Author: Qi Huang
Date and Time: Thursday, May 28, 8:30 a.m. - 5:00 p.m. CEST
Poster ID: FRI-635
Title: Proton-pump inhibitor omeprazole did not affect the plasma pharmacokinetics of bemnifosbuvir and ruzasvir fixed-dose combination in healthy participants
Presenting Author: Xiao-Jian Zhou
Date and Time: Friday, May 29, 8:30 a.m. - 5:00 p.m. CEST
Poster ID: FRI-636
Title: Bemnifosbuvir and ruzasvir administered as a fixed-dose-combination have low potential to inhibit P-gp, BCRP or OATP1B1/3 mediated transport
Presenting Author: Xiao-Jian Zhou
Date and Time: Friday, May 29, 8:30 a.m. - 5:00 p.m. CEST
About Bemnifosbuvir and Ruzasvir for Hepatitis C Virus (HCV)
Bemnifosbuvir has been shown in in vitro studies to be approximately 10-fold more active than sofosbuvir (SOF) against a panel of laboratory strains and clinical isolates of HCV GT 1–5. In vitro studies have also demonstrated bemnifosbuvir remained fully active against SOF resistance-associated substitutions (S282T), with up to 58-fold more potency than SOF. The PK profile of bemnifosbuvir supports once-daily dosing for the treatment of HCV. Bemnifosbuvir has been shown to have a low risk for drug-drug interactions. Bemnifosbuvir has been administered to over 3,000 subjects and has been well-tolerated at doses up to 550 mg for durations up to 12 weeks in healthy subjects and patients.
Ruzasvir has demonstrated highly potent and pan-genotypic antiviral activity in preclinical (picomolar range) and clinical studies. Ruzasvir has been administered to over 2,800 HCV-infected patients at daily doses of up to 180 mg for 12 weeks and has demonstrated a favorable safety profile. The PK profile of ruzasvir supports once-daily dosing.
About HCV
HCV is a blood-borne, single-stranded (ss) RNA virus that primarily infects liver cells. HCV is a leading cause of chronic liver disease and liver transplants, spreading via blood transfusion, hemodialysis and needle sticks, with approximately 240,000 deaths occurring each year. Despite the availability of direct acting antivirals, HCV continues to be a significant global healthcare issue. An estimated 50 million people worldwide are chronically infected with HCV and there are approximately one million new infections each year. In the US, approximately four million people are estimated to have HCV with annual new infections outpacing treatment rates. HCV infections in the US predominate in patients in the age group between 20 and 49 years old, and it is estimated that less than
About HEV
HEV is a ssRNA virus which infects the liver and remains an under-recognized global health challenge with an estimated 20 million acute infections annually. Waterborne transmission of HEV genotypes 1 and 2 causes mostly acute self-limiting hepatitis in developing regions, whereas foodborne transmission of HEV genotype 3 predominates in the US and Europe and is a cause of chronic hepatitis in immunocompromised patients, which can lead to cirrhosis in three to five years. There is a growing number of immunocompromised patients, a population that includes solid organ transplant and hematopoietic stem cell transplant recipients and patients with hematologic malignancies such as multiple myeloma. Each year, in the US and Europe,
About Atea Pharmaceuticals
Atea is a late-stage clinical biopharmaceutical company focused on discovering, developing and commercializing oral antiviral therapies to address the unmet medical needs of patients with serious viral infections. Leveraging Atea’s deep understanding of antiviral drug development, nucleos(t)ide chemistry, biology, biochemistry and virology, Atea has built a proprietary nucleos(t)ide prodrug platform to develop novel product candidates to treat single-stranded ribonucleic acid, or ssRNA, viruses, which are a prevalent cause of serious viral diseases. Atea plans to continue to build its pipeline of antiviral product candidates by augmenting its nucleos(t)ide platform with other classes of antivirals that may be used in combination with its nucleos(t)ide product candidates. Atea’s Phase 3 program is evaluating the FDC regimen of BEM, a nucleotide analog polymerase inhibitor, and RZR, an NS5A inhibitor, to treat HCV. Atea anticipates initiating clinical development of AT-587, a nucleotide analog, for the treatment of HEV in mid-2026. For more information, please visit www.ateapharma.com.
Forward-Looking Statements
This press release includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements in this press release include but are not limited to the dates and times of the presentations, statements regarding the potential best-in-class profile of the BEM/RZR regimen for the treatment of HCV, the potential to develop a product for the treatment of HEV, anticipated milestone events and timelines for clinical trials including the timeline for readout of the HCV Phase 3 clinical trials results and initiation of the HEV clinical development, future results of operations and business strategy. When used herein, words including “expected,” “should,” “anticipated,” “believe,” “will,” “plans”, and similar expressions are intended to identify forward-looking statements. In addition, any statements or information that refer to expectations, beliefs, plans, projections, objectives, performance or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking. All forward-looking statements are based upon Atea’s current expectations and various assumptions. Atea believes there is a reasonable basis for its expectations and beliefs, but they are inherently uncertain. Atea may not realize its expectations, and its beliefs may not prove correct. Actual results could differ materially from those described or implied by such forward-looking statements as a result of various important factors, including, without limitation, uncertainties inherent in the drug discovery and development process and the regulatory submission or approval process, unexpected or unfavorable safety or efficacy data or results observed during clinical trials or in data readouts; delays in or disruptions to clinical trials or our business; our reliance on third parties over which we may not always have full control; our ability to manufacture sufficient commercial product; competition from approved treatments for HCV; dependence on the success of Atea’s most advanced product candidates, in particular the BEM/RZR regimen for the treatment of HCV; as well as the other important factors discussed under the caption “Risk Factors” in Atea’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026 as such factors may be updated from time to time in its other filings with the SEC, which are accessible on the SEC’s website at www.sec.gov. These and other important factors could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management’s estimates as of the date of this press release. While Atea may elect to update such forward-looking statements at some point in the future, except as required by law, it disclaims any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing Atea’s views as of any date subsequent to the date of this press release.
Contacts
Jonae Barnes
SVP, Investor Relations and Corporate Communications
617-818-2985
barnes.jonae@ateapharma.com
Joyce Allaire
LifeSci Advisors
jallaire@lifesciadvisors.com
