Enanta Pharmaceuticals ($ENTA): Watching the -9.6% Pullback and Pipeline Progress Enanta Pharmaceuticals (ENTA) is a clinical-stage biotechnology company developing small-molecule antivirals for respiratory and liver diseases, backed by a recurring hepatitis C (HCV) royalty stream from AbbVie. The stock has traded in a narrow band around the low-to-mid teens, declining roughly 9.6% over the trailing 30 days as of late October 2026.