Mereo BioPharma Group plc, a $579M market cap biopharma, focuses on rare diseases like osteogenesis imperfecta (OI) and alpha-1 antitrypsin deficiency (AATD)-associated lung disease. Setrusumab, its lead asset for OI, shows promising Phase 2 results, with potential sales exceeding $750M. Alvelestat, targeting AATD, has encouraging Phase 2 data, paving the way for Phase 3 studies. With $81M in cash, Mereo's financial position supports operations into 2026/2027, and potential partnerships could enhance its financial flexibility. Analysts project significant market opportunities and upside potential for Mereo's stock.