Shares of Novartis (NVS - Get Report) were down slightly Monday on reports the drug-maker is in talks to buy generic-drugs maker Amneal Pharmaceuticals. A sale could value Amneal at as much as $8 billion. Novartis has fallen nearly 17% this year amid a bevy of mergers and acquisitions in the pharmaceutical sector.  Amneal is a family-owned business that employs more tha 4,000 people around the world. Meanwhile Novartis is a Swiss-based company that is currently Europe's second-largest drugmaker by sales.