Gilead Sciences, Inc. is a biopharmaceutical company, which engages in the research, development, and commercialization of medicines in areas of unmet medical need. The firm's main areas of focus embrace human immunodeficiency virus, acquired immunodeficiency syndrome, liver diseases, hematology, oncology, and inflammation and respiratory illnesses.

• At the time, NeXstar's annual sales of $130 million was 3 times Gilead's sales; it bought AmBisome, an injectable fungal therapy,…