Chimerix downgraded By: MarketMinute.com Stock News December 29, 2015 at 17:37 PM EST JPMorgan downgraded Chimerix Inc. (Nasdaq: CMRX) from an Overweight rating to a Neutral rating and slashed its price target from $62 to $12. The stock price gained 75 cents to close at $7.37. Related Stocks: Chimerix Inc