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StocksMedium•4 March 2026•

1 min read

Theravance Biopharma Shares Plunge 26% After Failed Phase III Clinical Trial

Key Facts

1Theravance Biopharma (TBPH) stock fell 26% following Phase III study results.

2The Phase III CYPRESS study of ampreloxetine missed its key endpoints.

Theravance Biopharma (TBPH) shares plummeted by 26% following disappointing results from its Phase III CYPRESS study. The clinical trial, which evaluated the drug ampreloxetine, failed to meet its primary endpoints, leading to a significant loss in investor confidence. Consequently, the company announced the immediate termination of the entire ampreloxetine development program. This failure represents a major setback for the biotech firm, as Phase III is typically the final stage before seeking regulatory approval. Investors reacted sharply to the news, triggering a massive sell-off during recent trading sessions. The discontinuation of the program wipes out a major potential revenue stream and represents a significant loss of R&D investment. Analysts view this development as a critical blow to the company's near-term valuation and growth prospects.