It is hard to really tell how well a company is doing in the games industry based on shares of the whole company. Nintendo is easier because they only do games but MS and Sony do so much more. I personally think that MS monopoly on PC OS is supporting all their other projects while Sony other projects are pulling their game division down.... well now anyway. Early 2000s Sony game division was pulling everything up, just like Nintendo's spike in 2007-8.
Hmm, pie.