Why Amarin Stock Was a Winner Today

A good day for a biotech is when one of its products wins regulatory authorization or approval. That was the case on Tuesday with Amarin (AMRN 0.79%), which announced that its sole commercialized drug had gotten the green light from a regulator across the Pacific Ocean. As a result, the company's share price crept up by almost 1%, more or less in line with the S&P 500 index's gain on the day.