Go to Invest Asia Online, and register yourself. Its free. Then you can check Malaysia markets, and there is a function to see 'Time & Sales'. This will show you the time of transaction, type of transaction and also the amount of the transaction.

Very useful to monitor how big the sell is or the buy is. It can also be used to check at what time the big sale/purchases are done.

Can be used for Malaysia, Singapore, Thailand and Vietnam stocks. I only use for Malaysia though.