After hours trades

[arae]

I'm just looking at the course of sales on various stocks using www.tradingroom.com.au and noticed there are often trades made shortly after 4pm. I'm curious, are these trades made by institutions? Also, how do they determine the price paid for each share? Is it based on the last offer price before the 4pm close?

Thanks for clearing things up for me!

 

[sirc]

http://www.asx.com.au/investor/education/basics/trading_hours_asx.htm

 

[arae]

Thanks for the link Circ