** Shares of drug developer Aridis Pharmaceuticals Inc
ARDS.O gain 54.6% to 28 cents premarket
** ARDS is among top five most actively traded stocks across
U.S. exchanges before the bell
** ARDS says the U.S. FDA agreed on the design of co's
late-stage study of its experimental pneumonia treatment,
AR-301, required to support the drug's marketing application
** Study's main goal to be tested among older adults 65
years of age and above, says co
** ARDS received a setback in March when it put a clinical
trial of another investigational pneumonia drug on hold amid a
license dispute and shifted focus to AR-301 and other drug
candidates
** ARDS shares suffered their worst quarterly drop ever in
Q1 and have lost 84.3% in value so far in 2023
** ARDS trading 97.8% below IPO price of $13/shr; Co went
public in 2018
(Reporting by Amruta Khandekar)
((Amruta.Khandekar@thomsonreuters.com;))