Another Pfizer lawsuit to stop Novo bid for Metsera

3 November 2025

Pfizer (NYSE: PFE) today announced that it has filed a second lawsuit against Metsera (Nasdaq: MTSR), its controlling stockholders, and Novo Nordisk (NOV: N) in the US District Court for the District of Delaware.

This follows Novo Nordisk’s last-minute interception of Pfizer’s September deal to buy the New York-based obesity focused biotech for $7.3 billion and the US pharma giant’s lawsuit announced on Friday. Metsera’s shares were down 2.8% at $61.30 after the revelation.

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