todays large trade

This morning a single trade was done for over 50 million shares at 17.5 cents (and a purchase of 630,577 a minute earlier).

Any thoughts on what this was all about?

Sonic Healthcare who held over 72% of the stock with over 700 million shares and Abtourk Pty Ltd with just over 61 million shares are the only possibilities here (on the sell side anyway).

Sonic taking more or offloaded some? Abtourk off loaded to someone other than Sonic?

Interested in thoughts.