It can only be one of the two (or a combination of both)
First of all, on Greys you can only match exact amounts of shares between a buyer and seller.
So...somebody put in an order to sell X amount of shares at .0004. Then, either the buyer was working with the seller "behind the scenes" and agreed to buy at the incredibly LOW price of .0004...
... or some idiot put in a market order without a specific price.
Either way. Dealing with idiots today in the market.
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