Arbutus Announces Preliminary Results of Its US$230 Million Modified “Dutch Auction” Tender Offer

WARMINSTER, Pa., Sept. 30, 2026 (GLOBE NEWSWIRE) -- Arbutus Biopharma Corporation (Nasdaq: ABUS) (“Arbutus” or the “Company”), a clinical-stage biopharmaceutical company focused on infectious disease, today announced the preliminary results of its tender offer (the “Offer”) to purchase for cancellation up to US$230 million in value of its common shares (the “Shares”). The Offer proceeded by way of a modified Dutch auction, which had a tender price range from US$5.00 per Share to US$5.75 per Share, and included the option for shareholders to participate via a proportionate tender. The Offer expired at 5:00 p.m. (New York City time) on September 29, 2026. All amounts are in U.S. dollars.

In accordance with the terms and conditions of the Offer and based on the preliminary calculation of TSX Trust Company, as depositary for the Offer (the “Depositary”), Arbutus expects to take up and pay for 46,000,000 Shares at a price of US$5.00 per Share under the Offer (the “Purchase Price”), representing an aggregate purchase price of US$230 million, excluding fees and expenses relating to the Offer, and approximately 23 percent of the total number of Arbutus’s issued and outstanding Shares as of the close of business on September 29, 2026. Immediately following completion of the Offer, Arbutus anticipates that approximately 153,275,907 Shares will be issued and outstanding.