09:22 AM EDT, 08/25/2025 (MT Newswires) -- Health care stocks were flat to lower pre-bell Monday, with the Health Care Select Sector SPDR Fund ( XLV ) inactive and the iShares Biotechnology ETF (IBB) down 0.2%.

Argenx (ARGX) stock was nearly 4% higher after the company said a phase 3 study of its drug Vyvgart met its primary endpoint in treating patients with AChR-Ab seronegative generalized myasthenia gravis, an autoimmune disease.

Axogen ( AXGN ) shares were down more than 10% after the company said the US Food and Drug Administration has extended the review deadline for its marketing application for the Avance Nerve Graft by three months.

BeOne Medicines ( ONC ) shares were up more than 2% after the company said it has agreed to sell its royalty rights, excluding China, on Amgen's ( AMGN ) lung cancer drug, Imdelltra, to Royalty Pharma ( RPRX ) for up to $950 million.