Yes. But form t's are usually a missed trade that should have filled in regular hours trading. But can, to some small extent, be used to misslead the newbe investor if the broker wishes to portray weakness after the close (usually the case). But I have in the past seen form t's increase the price overnight also. Personally, I don't pay much attention to them, because the price always corrects at, or shortly after, the market open in the morning.
I have a couple of times gotten orders filled by calling my broker about orders that should have been filled, but where passed over. You call and demand what is called time & sales data.If your order was passed over, the broker can force a fill on the MM's. And it can then sometimes go thru as a form T. And occasionally it will just be filled without ever being reflected as a trade (reflected in the volume, but not a price change).