"Odds are 99% or higher that was a nonsense trade with a mistake in the number or the symbol or both. "
I would have guessed it was a symbol mistake, but there's an odd coincidence to it. The trade went through at $2.7139 on a day when the CTIX pps range was $2.68-2.75. I suspect that would make it suspiciously close to the day's volume waited average price, the price that we frequently see used for trades made or reported shortly after the close on behalf of a larger buyer/seller.
It doesn't seem likely to me that that price would so coincidentally within CTIX's range for the day if it was the case of an order entered under the wrong symbol.
Nor does it seem reasonable to me that a number like 1,329,079 gets entered by accident by anyone....no one has fingers that fat.
That said, there are few known entities with the resources to place a $3.6M trade in either direction. And I don't know how it gets undone....especially a minute after entry:
16:12 $ 2.7139 1,329,079 - Cancelled Trade
16:11 $ 2.7139 1,329,079
Weird stuff, with at least one element that seems real.