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 continuing digestion of last week’s brensocatib CRSsNP trial miss. [1]
Below is what happened after the bell on Dec. 22, 2025, and the key items to know before U.S. markets open Tuesday, Dec. 23, 2025.
INSM stock price after the bell: where shares finished and what after-hours trading showed
Insmed closed regular trading on Monday, Dec. 22 at $175.76, up 0.53%. The session range was $174.00 to $179.33 on volume of about 2.74 million shares, according to one widely…
