Insmed (INSM) Stock: What to Know Before the Market Opens on Dec. 22, 2025
Insmed Incorporated (NASDAQ: INSM) heads into the Monday, Dec. 22, 2025 session with two powerful—almost opposing—forces in play: a fresh clinical disappointment that jolted sentiment last week, and a major index catalyst that can drive mechanical buying at the open. Shares last closed at $174.84 (up about 5% on the day) after an exceptionally volatile week for the biotech, with after-hours trading roughly flat. StockAnalysis Below is what investors and traders typically want on their radar before the bell. The biggest catalyst for Monday: Insmed joins the Nasdaq-100 before the open Insmed is scheduled to be added to the Nasdaq-100