Alnylam Pharmaceuticals (ALNY) shares tumbled 7.45% in pre-market trading on Thursday after the company reported second-quarter revenue that fell short of analyst expectations.
The biotech firm posted revenue of $1.29 billion for the quarter, missing the consensus estimate of $1.323 billion according to Ibes data. The top-line miss appeared to overshadow the company's operating income figures, which were also released alongside the revenue report.
Investors reacted swiftly to the shortfall, driving the stock sharply lower in early trading. The decline highlights the market's sensitivity to revenue growth metrics for high-valuation biotech companies like Alnylam.