Regulus Therapeutics CEO resigns By: MarketMinute.com Stock News June 02, 2015 at 19:13 PM EDT Regulus Therapeutics Inc. (Nasdaq: RGLS) president and chief executive Kleanthis G. Xanthopoulos has resigned sending the stock price plummeting $2.25 to close at $11.53. Related Stocks: Regulus Therapeutics