Trisha...I'd been looking for an answer to that question for a long time to no avail. i've seen stocks jum almost 300+%on no news and others like NSDM decline on good news. personaly, I think that it is the Market Makers who manipulate the stocks. i've come to the conclusion that whenever i buy a stock it will decline and when i sell it it will increase. So now I am just patient and wait.
Market Data 
Markets 
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