** Shares of ecommerce marketplace ATER.O up 24% at $4.79,
heading for best week ever
** Trading at levels last seen in mid-December
** Stock fourth most actively traded across U.S. exchanges
** ATER features in the top 10 most discussed on
investor-focused social media forum stocktwits.com
** Short interest has shot up to 36.6% of co's free float vs
21.4% on March 21, according to Ortex data
** Including session gains, ATER has more than doubled in
value this week
** Stock has also turned positive on the year in Friday's
session, set to extend YTD climb to 15% if gains sustain
(Reporting by Medha Singh)
((medha.singh@thomsonreuters.com))