** Shares of cancer drug maker Puma Biotechnology Inc
PBYI.O down 2.2% at $3.15
** Co files for offering of nearly 1.8 mln common shares by
existing investor, Athyrium Opportunities Associates IV
Co-Invest 2 urn:newsml:reuters.com:*:nFWN2Z40D6
** Athyrium's current ownership stands at 3.93%, which will
be eliminated entirely if all offered shares are sold, according
to a filing with the SEC
** At current levels, Athyrium's stake would fetch $5.4 mln
in proceeds
** As of last close, PBYI stock is up nearly 6% YTD
(Reporting by Niket Nishant in Bengaluru)
((Niket.Nishant@thomsonreuters.com;))