I'll admit I know nothing about how these algorithm based trade...

I'll admit I know nothing about how these algorithm based trade systems work (and trading generally for that matter), however a couple of questions for you kwaidan1:

* If it is a trader, why would they want the SP to close on its high?
* This is drip feeding at its finest: adding, like, 20 or 50 shares every few minutes or less;
* ASX states official shorts on AMU as only 20,000 shares. As such, if they HAVE sold at a higher level it is either this many shares max, or they have borrowed shares from someone so they do not have to disclose. I'm honestly not inclined to believe it is a short - but then I am only really guessing.

All seems strange, but at these volumes anyway not material. Just interesting.

MJS