I think when you see a small amount of T trades it is just previously unrecorded trades. But if you see a slew of T trades coming in after the bell it could very well be dilution. I can't recall the ticker but there was one recently that went up during the day and then after the bell there were loads and loads of prints under the current ask. I never saw so many late prints. The next day it opened up with a few upticks from the previous close (before the t trades) but then it plummeted hugely after the first few prints.
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