Insmed (INSM) Stock After Hours Today (Dec. 22, 2025): Closing Price, Nasdaq-100 Effect, Fresh Forecasts, and What to Watch Before Tuesday’s Open
Insmed Incorporated (NASDAQ: INSM) ended Monday’s session slightly higher and then traded in a tight range after the closing bell, as investors weighed two forces that have been shaping the stock into year-end: Nasdaq-100 inclusion (effective today) and the market’s