Shares of Bristol Myers (BMY) have lost 20.7% in the past three months compared with the industry’s decline of 9.6%. The stock has also underperformed the sector and the S&P 500 during this period.While the year started on a positive note and BMY was faring well (outperforming the market), the stock has been on the downslide for the past couple of months.BMY Underperforms Industry, Sector & S&P 500 IndexImage Source: Zacks Investment ResearchEven though the first-quarter performance was better-than-expected ...