Enanta loses Paxlovid patent appeal as US appeals court invalidates claims

Enanta Pharmaceuticals, Inc.
Pfizer Inc.

Enanta Pharmaceuticals, Inc.

ENTA

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Pfizer Inc.

PFE

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  • Enanta lost its appeal in a patent case against Pfizer tied to Paxlovid.
  • On June 23, 2026, the Federal Circuit upheld a December 2024 summary judgment from a Massachusetts federal court.
  • The appeals court ruled claims in Enanta’s U.S. Patent No. 11,358,953 invalid, blocking damages for alleged infringement.


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