On May 6, 2026 Vir Biotechnology, Inc. (Nasdaq: VIR), reported a corporate update and announced financial results for the first quarter ended March 31, 2026.

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"Vir Bio delivered incredible momentum during the first quarter with positive, new VIR-5500 Phase 1 data and execution of a global agreement with Astellas in prostate cancer. The closing of our collaboration with Astellas in April has ignited the next stage of development work, bolstering our ability to move faster and think bigger together," said Marianne De Backer, Chief Executive Officer of Vir Biotechnology. "We also announced promising updated Phase 2 data on our combination regimen in CHD and will be presenting complete Week 96 data at the EASL Congress later this month. CHD is the most severe form of hepatitis. We believe our well-tolerated combination regimen is uniquely positioned to change the standard of care, bringing together robust efficacy with the potential for self-administration at home with once monthly subcutaneous dosing."

Pipeline Programs

Chronic Hepatitis Delta (CHD)

The Company will present additional data from the Phase 2 SOLSTICE trial evaluating the combination of tobevibart and elebsiran for CHD at the EASL Congress taking place May 27-30, 2026.
Earlier this year, the Company reported Phase 2 SOLSTICE data showing that the monthly combination of tobevibart and elebsiran was highly efficacious and well-tolerated. Undetectable hepatitis delta virus RNA (HDV RNA Target Not Detected, TND) was achieved and maintained by 77% (24/31) of participants receiving the combination regimen at Week 72. This rate increased to 88% (21/24) in the subset of participants evaluated through Week 96.
Topline data from the Phase 3 ECLIPSE 1 trial are expected in the fourth quarter of 2026.
Topline data from the ECLIPSE 2 and ECLIPSE 3 trials are expected in the first quarter of 2027.
Solid Tumors

VIR-5500

The Company closed its global strategic collaboration with Astellas to advance PSMA-targeted, PRO-XTEN dual-masked TCE VIR-5500 for the treatment of prostate cancer.
The first patient was dosed in the Phase 1 dose-expansion cohorts evaluating the safety, pharmacokinetics and preliminary efficacy of VIR-5500 in prostate cancer. The first expansion cohort will evaluate VIR-5500 monotherapy in Q3W 800/2000/3500 µg/kg step-up dosing in late-line metastatic castration-resistant prostate cancer (mCRPC). The Company anticipates initiating pivotal Phase 3 trials in 2027.
Positive updated Phase 1 data for VIR-5500 monotherapy showed dose-dependent anti-tumor activity and a well-tolerated safety profile in patients with mCRPC. The data were presented in an oral presentation at the 2026 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Genitourinary Cancers Symposium.
VIR-5818

Phase 1 dose-escalation of VIR-5818, a HER2-targeted PRO-XTEN dual-masked TCE, in combination with pembrolizumab continues, with response data expected in the second half of 2026.
VIR-5525

The Phase 1 study of VIR-5525, an EGFR-targeted PRO-XTEN dual-masked TCE, continues enrollment as expected.
Preclinical Pipeline Candidates

The Company is currently progressing a number of PRO-XTEN masked TCEs in preclinical studies directed at clinically validated targets with potential applications across a variety of solid tumors, including lung, colorectal and bladder.
Corporate Update

The Company completed a follow-on public offering of common stock with gross proceeds of $172.5 million, before deducting underwriting discounts and commissions and offering expenses.
First Quarter 2026 Financial Results

Cash, Cash Equivalents and Investments: As of March 31, 2026, the Company had $809.3 million in cash, cash equivalents and investments, representing an increase of approximately $27.7 million during the first quarter of 2026. During the first quarter of 2026, the Company completed a public offering of its common stock with gross proceeds of $172.5 million, before deducting underwriting discounts and commissions and offering expenses.

Research and Development (R&D) Expenses: R&D expenses for the first quarter of 2026 were $108.9 million, which included $6.0 million of non-cash stock-based compensation expense, compared to $118.6 million for the same period in 2025, which included $7.0 million of non-cash stock-based compensation expense. The decrease was primarily driven by a $30.0 million expense in the first quarter of 2025 in connection with signing the restated Alnylam agreement, partially offset by higher CHD contract manufacturing costs associated with process performance qualification batches in preparation for commercialization, and to a lesser extent, higher clinical expenses from the progression of both our CHD and oncology programs in the first quarter of 2026.

Selling, General and Administrative (SG&A) Expenses: SG&A expenses for the first quarter of 2026 were $23.3 million, which included $6.1 million of non-cash stock-based compensation expense, compared to $23.9 million for the same period in 2025, which included $7.1 million of non-cash stock-based compensation expense.

Net Loss: Net loss for the first quarter of 2026 was $125.7 million, or $0.85 per share, basic and diluted, compared to a net loss of $121.0 million, or $0.88 per share, basic and diluted for the same period in 2025.

2026 Financial Guidance

Based on our current operating plans, including the net effects of the Astellas global collaboration, the Astellas equity investment and the completion of the recent equity financing, the Company expects its cash, cash equivalents and investments to fund operations into the second half of 2028.

Conference Call

Vir Biotechnology will host its first quarter 2026 financial results conference call at 4:30 p.m. ET / 1:30 p.m. PT today. A live webcast will be available at View Source and will be archived for 30 days.

About the ECLIPSE Registrational Program

ECLIPSE is a registrational program to evaluate the safety and efficacy of tobevibart in combination with elebsiran in patients with chronic hepatitis delta (CHD). ECLIPSE includes three randomized, controlled trials designed to evaluate the combination therapy in comparison to deferred treatment or bulevirtide. ECLIPSE 1 (NCT06903338) is a Phase 3 trial evaluating the safety and efficacy of tobevibart in combination with elebsiran compared to deferred treatment in the U.S. or other regions where bulevirtide use is limited. ECLIPSE 2 (NCT07128550) is a Phase 3 trial evaluating the efficacy and safety of switching to tobevibart and elebsiran in people with CHD who have not achieved viral suppression with bulevirtide therapy. ECLIPSE 1 and 2 are designed to provide the registrational efficacy and safety data needed for potential submission to global regulatory agencies. ECLIPSE 3 (NCT07142811) is a Phase 2b head-to-head trial evaluating combination tobevibart and elebsiran compared with bulevirtide in bulevirtide-naïve patients, and it is designed to provide important supportive data to help establish access and reimbursement in key markets.

About Tobevibart and Elebsiran

Tobevibart is an investigational broadly neutralizing monoclonal antibody (mAb) targeting the hepatitis B surface antigen (HBsAg). It is designed to inhibit the entry of hepatitis B and hepatitis delta viruses into hepatocytes and to reduce the level of circulating viral and subviral particles in the blood. Tobevibart was identified using Vir Biotechnology’s proprietary mAb discovery platform. The Fc domain has been engineered to increase immune engagement and clearance of HBsAg immune complexes and incorporates Xencor’s Xtend technology to extend half-life. Tobevibart is administered subcutaneously, and it is currently in clinical development for the treatment of patients with chronic hepatitis delta.

Elebsiran is an investigational hepatitis B virus-targeting small interfering ribonucleic acid (siRNA) licensed from Alnylam Pharmaceuticals, Inc. It is designed to degrade hepatitis B virus RNA transcripts and limit the production of HBsAg. Current data indicate that it has the potential to have direct antiviral activity against hepatitis B virus and hepatitis delta virus. Elebsiran is administered subcutaneously, and it is currently in clinical development for the treatment of patients with chronic hepatitis delta.

About Chronic Hepatitis Delta (CHD)

CHD is the most severe form of chronic viral hepatitis2 and was recently classified as carcinogenic by the International Agency for Research on Cancer.3 People living with the disease rapidly progress to cirrhosis, liver failure4 and liver-related death.2 There are currently no approved treatments in the U.S., and options are limited in the European Union and globally.

About VIR-5500, VIR-5818 and VIR-5525

VIR-5500, VIR-5818 and VIR-5525 are investigational, clinical candidates currently being evaluated for the treatment of solid tumors. These assets leverage the universal PRO-XTEN masking technology and target PSMA, HER2 and EGFR, respectively.

TCEs are powerful anti-tumor agents that can direct the immune system, specifically T-cells, to destroy cancer cells. The universal PRO-XTEN masking technology is designed to keep the TCEs inactive (or masked) until they reach the tumor microenvironment, where tumor-specific proteases cleave off the mask and activate the TCEs, leading to killing of cancer cells by T-cells. By confining the activity to the tumor microenvironment, we aim to circumvent the traditionally high toxicity associated with TCEs and increase their efficacy and tolerability. Additionally, the mask is designed to help drug candidates stay in the bloodstream longer in their inactive form, allowing them to better reach the site of action and potentially allowing less frequent dosing regimens for patients and clinicians.

About Advanced Prostate Cancer

Prostate cancer remains a significant global health burden, representing the second leading cause of cancer-related mortality in men behind lung cancer.5 While diagnostic and therapeutic advances like androgen-directed therapy can improve outcomes in earlier settings, most patients ultimately relapse and develop metastatic hormone sensitive prostate cancer (mHSPC).6 mHSPC is characterized by its responsiveness to intensified hormonal interventions designed to reduce androgen levels or block their action. The majority of these patients eventually progress to metastatic castration-resistant prostate cancer (mCRPC).7 This stage is associated with poor clinical outcomes, including limited durability of existing therapies, with a 5-year survival rate of approximately 30%.8 There is a critical need for safer, more effective, and precisely targeted therapies capable of improving long term disease control and quality of life across the prostate cancer continuum.

(Press release, Vir Biotechnology, MAY 6, 2026, View Source [SID1234665223])