For top gainers n losers, you can infer that an important event
happened recently to them. For example earnings announcements or
M&A or lawsuits. Such events will move the stock more than
usual and they will sit on top of the rankings as the top gainers
or top losers. Something moved them there.
If it form a new/ continuous trend, you can jump in front and surf
the wave.
Top volume doesnt mean much if it doesnt represent a major change,
like either a spike or drop from previous averages. It will infer
only that the stock is most liquid. If the top volume has
significant spike or drop, you can infer the same thing like top
gainers and losers, that an important event just happened to
it.
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(investments.sgforums.com)
