Shares of Viking Therapeutics fell more than 30% in premarket trading Tuesday after the company released mid-stage trial data on its obesity pill that disappointed investors. The results could be a blow to Viking, which was once seen as a hot M&A target as pharmaceutical companies scramble to join the booming market for obesity and diabetes drugs. It could reinforce Eli Lilly and Novo Nordisk's dominance in the space, especially as they develop pills for weight loss that could enter the market years ahead o ...