Regeneron Pharmaceuticals
stock was tumbling after the medicine maker reported lower sales of its Eylea treatment than Wall Street was anticipating for the fourth quarter.
In a preliminary update on its fourth quarter on Monday,
Regeneron
(ticker: REGN) said fourth-quarter sales of Eylea were $1.5 billion. The consensus call among analysts tracked by FactSet was for $1.64 billion, while the year-earlier figure was $1.55 billion.