** Shares of drug developer Celldex Therapeutics CLDX.O climb 4% to $35.95 premarket
** Barclays upgrades the stock to "overweight" from "underweight"; hikes PT to $45 from $24
** New PT represents a 30.2% upside to stock's last close
** Brokerage says clinical trial of co's drug barzolvolimab's filled up with patients six months ahead of schedule, "which at a minimum speaks to the demand and enthusiasm for the asset"
** Barzolvolimab is being developed as a treatment for chronic spontaneous urticaria (CSU), a skin condition causing chronic hives
** Barclays raises probability of success estimate for Barzolvolimab to 85% from 65% and projects $1.4 billion in peak sales, with additional revenue potential from expanded indications in related conditions
** As of last close, CLDX up 27.2% YTD
(Reporting by Ragini Mathur in Bengaluru)
((Ragini.Mathur@thomsonreuters.com;))