** Shares of British online retailer ASOS ASOS.L up as much as 10.7% to 249 pence
** Co says its GMV growth further improved sequentially in Q3 to date and new customer growth up 9% in March, the first increase since September 2021
** The new customer growth is a good lead indicator for top line, so that gives us confidence in it for the long term turnaround - Shore Cap analyst Katie Cousins
** ASOS has not seen any major impact yet from the Iran war, CEO José Antonio Ramos Calamonte tells reporters in a media call
** Co says it has also begun seeking refunds for U.S. tariffs and left its FY26 guidance unchanged
** ASOS down ~20.6% this year, as of last close
(Reporting by Megha Kumari in Bengaluru)
((Megha.Kumari@thomsonreuters.com))