Yes a good portion of the sell off came before todays news but the news was expected and specifically this afternoon's action was clearly a "Sell the News" response since now it is out there.
Otherwise had this Mako news been received as a positive for today's trading then you would have seen DPDW respond positively too.
Don't get me wrong, this is good news but news that was already baked into the DPDW price, down the road as this news develops the anticipated results and additional info feed, DPDW will respond accordingly.
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