Just how much Medicare price negotiations will negatively impact Novo Nordisk, though, depends on what the final negotiated prices for Ozempic, Wegovy, and Rybelsus will be. In Medicare's negotiations for 2026, the new prices achieved an average of 22% savings.

Shares of Novo Nordisk surged over 13% in premarket trading Friday, driven by promising topline results from a early-stage trial of amycretin, a new weight-loss drug candidate. If gains hold, this could mark the stock’s best single-day performance since Aug.

The new treatment targets gut hormone GLP-1 but also mimics amylin, a hormone released by the pancreas that suppresses hunger.