Is this really based on Metroid? There's other news that's more relevant to stock value going around right now. For example: there was also talk about Nintendo maintaining the 20M shipment numbers, a portion of the shareholders may have had higher expectations.
Metroid is a low tier seller for Nintendo, they usually are insignificant in stock market valuation.
Otherwise, I would suggest it is based on a calculation based on ignorance of impact of Metroid - which is trivial in the grand scheme. Metroid is a popular franchise among a certain niche (personally, I really like the early games, but am not able to get into the later ones), and some might be reading the game as a ~12 million title instead of a 2-2.5M title. I suppose if they did something like a Breath of the Wild style game - but it's going to probably be cloning 20 year old designs, rather blowing the box open like Breath of the Wild did.
Last edited by Jumpin - on 28 January 2019I describe myself as a little dose of toxic masculinity.