BIOCRYST PHARMACEUTICALS INC

As previously disclosed, in January 2025, we received a Paragraph IV notice of certification (the “First Notice Letter”) from Annora Pharma Private Limited (“Annora”) regarding U.S. Patent Nos. 10,662,160; 11,117,867; and 11,618,733. In January 2026, we received an additional Paragraph IV notice of certification (the “Second Notice Letter” and together with the First Notice Letter, the “Notice Letters”) from Annora regarding U.S. Patent No. 12,344,585. The Notice Letters advise that Annora has submitted an Abbreviated New Drug Application (“ANDA”) to the FDA seeking approval to manufacture, use or sell a generic version of ORLADEYO in the United States prior to the expiration of four patents listed in the FDA’s Orange Book: U.S. Patent Nos. 10,662,160; 11,117,867; 11,618,733; and 12,344,585 (the “Challenged Patents”). The Notice Letters allege that the Challenged Patents, which expire in May 2040, are invalid, unenforceable and/or will not be infringed by the commercial manufacture, use or sale of the generic product described in Annora’s ANDA. The Notice Letters do not challenge the following six ORLADEYO Orange Book patents that expire in 2035: U.S. Patent Nos. 10,125,102; 10,329,260; 10,689,346; 11,230,530; 11,708,333; and 12,116,346.

On March 10, 2025 (as supplemented by the First Amended Complaint filed in December 2025), we filed a patent infringement lawsuit in the United States District Court for the District of Delaware against Annora, Hetero Labs Limited, Hetero USA, Inc., and Camber Pharmaceuticals, Inc. (collectively, the “Defendants”), asserting infringement of the Challenged Patents arising from Annora’s ANDA filing with the FDA. We are seeking, among other remedies, equitable relief enjoining the Defendants from infringing the Challenged Patents, as well as an order that the effective date of any FDA approval of the ANDA would be a date no earlier than the expiration of the Challenged Patents (including any regulatory extensions). While we intend to vigorously defend our intellectual property rights protecting ORLADEYO, this matter is in the early stages of litigation and no assessment can be made as to the likely outcome of this matter or whether it will be material to us. Accordingly, an estimate of the potential loss, or range of loss, if any, to us relating to this matter is not possible at this time.