Glaukos downgraded By: MarketMinute.com Stock News April 13, 2018 at 18:30 PM EDT Stifel downgraded Glaukos Corp. (NYSE: GKOS) from a Buy rating to a Hold rating and cut its price target from $39.00 to $32.00. The stock price plunged $3.05 to close at $27.62. Related Stocks: Glaukos Corp