I think it means it was one of those ‘dark pool’ trades that is...

I think it means it was one of those ‘dark pool’ trades that is invisible to the people playing around with algorithms until after it goes through .
Off market until it was announced.
I might be wrong but from what I have read the market gets read and analysed to a very high degree by what’s there ‘out in the open’ on the boards.
Doing it that way may have kept the price down...
It also means someone stuck half a million dollars in (and someone else sold) at the highest price of recent trading days .
It also means that my stupid penchant for chasing penny dreadfuls to gamble with whilst I sit here watching NRW (which has just landed me in a hurtful loss situation with a company now in administration) ..Will not hurt so much -on paper at least - if the way I read this is correct and we are being prepped to go up again on some solid good news.

This being said I don’t know anything about anything which is why I digressed into various other companies against the best advice .
Cheers