Indices closed in the green zone on Monday. Brands posted slight gains ahead of the Trump-Kim summit in Singapore. In M&A moves, KKR & Co. tacked on 1.2% today after agreeing to acquire Envision Healthcare Corp. for $9.9 billion. Workday shed 0.55% after announcing a plan to purchase cloud-based business planning company Adaptive Insights for $1.55 billion. Looking ahead, the Federal Reserves kicks off a two-day FOMC meeting on Tuesday.