Nintendo shares themselves don't trade in the US (these are something else). Nintendo shares in Japan are close to $500AU / share.
Waiting for E3 - going to have a big impact on the stock prices of all three companies (and the smaller companies).
If Sony makes announcements that will steal some of Nintendo's casual market (smaller/simpler PSP, Waggle for PS2) Nintendo may suffer.
But if Nintendo can unveil some really innovative (and I think that is the key word) titles for the Wii, then their stock price may skyrocket.
I would hedge my bets, and hold on to Nintendo shares at this time. Sony shares will probably also skyrocket (more upside than Nintendo at the moment).
Gesta Non Verba
Nocturnal is helping companies get cheaper game ratings in Australia:
Wii code: 2263 4706 2910 1099
