20 Million Dollars Plus of Shares at end of trade Friday - Please Explain

Question?

Excuse my lack of knowledge in this instance, but could anybody please explain what just happened at after close leading up to 20 Million Shares Plus causing the SP to go from 1.5 % in the red to 1.46 % in the green.

1.Was this a management fund

2.Was this a short position gone wrong?

3.Was this the beginning of hostile takeover?

4.Was this something to do with the PNG retail offer?

5.Cleansing Notice Daily Fund Update?

Part B of 1^st Question

1.How much would of the brokerage been on 20 mill or is that done directly

I appreciate any intelligent response as i see this as a rare activity and a rare opportunity to learn something as I have never seen anything on this scale before.

TY in advance :