For QID for example, my broker information shows less than a million shares traded in one day. But when I check this ETF at Yahoo Finance and Google Finance. QID trading volume comes up as more than 20 million.
Where is this huge 20-fold difference in trading volume coming from?
This huge difference in trading volume comes up only for ETF's from the American Stock Exchange. But for an ETF from NASDAQ, QQQQ, my broker and the other sources show the same trading volume.
Is there something fishy going on at the American Stock Exchange that I'm not aware of?




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