You already know this, even though others don't. If my brokerage firm uses an outside market maker like NITE to sell 135 shares of TEVE for me as part of a larger sell order, that trade will be marked "short" - because my 135 shares will not be sent over from my brokerage firm to the market maker until AFTER THE TRADE PRINTS. Sometimes not until the end of the trading day, in fact.
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