Were the buyers on screen or did they come from off screen?
Could have been Sino doing a quick accumulate then stop. Let it cool. Then go again in a couple of says.
However MMX would have outted them on the ASX query.
If it were Sino which i don't believe it is. Management would be so quick to tell us its not funny.
Sounds to me like pump & dump as the T/o of shares has stopped already.