Bank of America Merrill Lynch downgraded Green Mountain Coffee Roasters Inc. (Nasdaq: GMCR) from a Buy to a Neutral rating. Starbucks Corp. (Nasdaq: SBUX) announced yesterday that it will introduce a single serve coffee machine in the fall. Shares of Green Mountain plummeted $9.73 to $52.67 while Starbucks stock climbed $1.60 to $51.97.