** Shares of Archtis Ltd AR9.AX fall as much as 19.6% to A$0.185
** Biggest intraday fall since June 24
** The data-centric software solution provider says it secured firm commitments for share placement worth A$7.5 million ($4.93 million)
** To issue 50 mln shares at an issue price of A$0.15 per share
** Issue price represents discount of 34.8% to AR9's last close on June 27
** New shares represent ~26% of AR9's free float of 190.5 million, as per LSEG data
** AR9 says placement will help ramp up its growth in U.S. defence market, among others
** More than 1.2 mln shares change hands, vs 30-day avg of ~810,000 shares
** Stock up ~200% YTD, including the session's moves
($1 = 1.5228 Australian dollars)
(Reporting by Anjali Singh in Bengaluru)
((anjali.singh2@thomsonreuters.com))