Metsera (MTSR) Delists as Pfizer Closes Up to $10 Billion Obesity Drug Deal – All the Key Updates on November 17, 2025
Pfizer’s acquisition of Metsera, Inc. (formerly NASDAQ: MTSR) is now effectively complete, Metsera’s stock has been delisted, major index providers are removing the name, and antitrust scholars are using the failed Novo Nordisk bid as a case study in “attempted monopolization.” Here’s a full rundown of what matters today, 17 November 2025, for anyone following Metsera, MTSR, or the obesity‑drug arms race. 1. Where the Metsera–Pfizer Deal Stands Today Pfizer formally closed its acquisition of Metsera on November 13, 2025, after Metsera shareholders approved a sweetened offer that values the obesity biotech at up to $10 billion. Reuters+1 Key terms