** Shares of U.S.-based convenience store operator Arko Corp
ARKO.O up 4.8% at $7.38
** Co says board increased previously authorized share
repurchase program by an additional $50 mln
** Adds that it now has availability to repurchase up to $59
mln of ARKO's outstanding shares of common stock
** Says it is encouraged by progress in its merchandise and
fuel strategy to maximize gross profit dollars
** The repurchase program does not have a stated expiration
date
** ARKO shares down 13.86% YTD
(Reporting by Saikeerthi in Bengaluru)
((Saikeerthi@thomsonreuters.com;))