ACELYRIN Adopts Limited-Duration Stockholder Rights Plan

Core Points - ACELYRIN, INC. has adopted a limited-duration stockholder rights plan in response to Tang Capital Partners accumulating 8.8% of its outstanding common stock [1][3] - The rights plan aims to maximize stockholder value and is effective immediately, expiring on March 12, 2026 [2][4] Rights Plan Details - Each share of common stock will receive one right, which will become exercisable if any person acquires 10% or more of the company's outstanding common stock [3] - Holders of rights (excluding the acquiring person) can purchase additional shares at a price equal to twice the exercise price [3] - Current owners exceeding the Triggering Percentage can retain their shares but cannot acquire more without triggering the rights plan [3] Company Overview - ACELYRIN focuses on developing transformative medicines in immunology, with its lead program being lonigutamab, a monoclonal antibody for thyroid eye disease [5]