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The trading information I get from my broker shows a lot less trading volume for ETF's such as OIH and QID than the trading volume reported by Yahoo Finance and Google Finance.

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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Well you could be looking at two different numbers yahoo posts an average trading volume as well as daily volume and only brokers with up to the second tickers can get you the most reliable volume information otherwise you'll have to wait until say at 4:30 to 4:45 to get the volume numbers.

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