Daily Short "Volume" (regsho): Intraday volume Market Makers transactions when they temporarily short a stock for a couple of seconds or a minute to fill an order in a timely manner, then cover a couple minutes later (otcshortreport lies and calls this naked shorts). Meaningless number because it's just the first leg of a transaction reported of filling orders. Completely unrelated to short interest. This number can often be quite high for thinly traded stocks, thus more likely to get hyped as shorts, even though it's not.
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