List of most volatile stocks long term?

Does anyone know where I find a list of stocks that are most volitile up or down over a term or 6 months or longer? I would like to test some out for straddle options strategy. Most of the stock filters and list are only for the last 30 days usually in an earnings period. I need a list with stocks that have the biggest swings all the time. Thanks.
 
Quote from johnmarg:
Does anyone know where I find a list of stocks that are most volitile up or down over a term or 6 months or longer? I would like to test some out for straddle options strategy. Most of the stock filters and list are only for the last 30 days usually in an earnings period. I need a list with stocks that have the biggest swings all the time. Thanks.

Try the stock screeners of Yahoo and Google (need to finetune with your own params; for volatile stocks take Beta >= 2 or so):

http://screen.yahoo.com/b?sc=&im=&p...&pegmin=&pegmax=&gr=&grfy=&ar=&vw=1&db=stocks

http://www.google.com/finance/stock...&region=us&sector=AllSectors&sort=&sortOrder=
 
ISRG, FSLR, BIDU, and GMCR have some decent large swings, even when in a strong trend.

For regular large swings percentage-wise, I think the airlines take the cake.
 
This can be done easily in Amibroker

Create a filter that measures volume*C to determine liquidity, One for Standard Deviation in % terms...


You can then order them by both $ liquidity, volatility or both


Filter = 1;

AddColumn(MA(C*Volume,100), "Dollar Volume", 1.2 );

AddColumn(MA(StDev(C,2)/C*100,100),"StDev",1.2);

AddColumn(MA(C*Volume,100)*MA(StDev(C,2)/C*100,100),"StDev Times Volume",1.2);

AddTextColumn( FullName(), "Company Name" );

Sort them in the Results Rows when finished....
 
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