You all may have already thought of this, but could it be an important client placing a large buy order. The MM then accumulates shares all day long until he can fill it as one transaction order. It would keep the pressure off and allow the MM to acquire the shares throughout out the day in an "orderly fashion". Just an amateur's reasoning.
Late reports like this during normal market hours requires reporting time, price, etc with a trade modifier. So, if there were more than one transaction, each transaction by rule must be reported separately.
Do you have the trade modifier (T, Z or U) for this transaction on your display?
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