i don't know what the parameters for CNBC's streamer listings are, but one can generally find the largest gappers streaming by, and i'd say the advantage of that source is the built in audience/traders that are apt to add to volume/liquidity that another source may not be tapping into. i like to find those tickers that don't normally go by during the intra-day (not the focus here, i understand) that seem to be in play to watch as well. but i realize susan's question is basically source of intial information rather than somewhat delayed evidence, via aforementioned streamer.