Have a look at it

http://www.nasdaq.com/symbol/ntdoy

Nintendo stocks went up 4,9%....

I don't know why people are so negative, last time when it was down 6%, everyone was talking about it

Since when do people talk about good news? lol

The fact is nobody on this site besides two people actual know how stock work.

Nikkei 7974 is the correct stock.

NTDOY is an ADR stock meant to track the Japanese stock's value but be traded in the US for convenience; the American markets are closed so it hasn't updated to reflected reality.

tl;dr Your info is out of date

It was going up because of the stock buy back. Generally speaking any time a company initiates a stock buy back, the stock price will always rise. 

It's now going back down because investors are upset with Nintendo's investor briefing:

The ire of investors may be growing. Nintendo’s stock is now off 4%, worse than a 3.2% fall in the benchmark Nikkei Stock Average. (Wallstreet Journal).

l

Did you miss out on the stock buying programm they announced?

Did they begin it already?

Do they need to?

Investors react as soon as they know, suspect something. The stockmarket is psychological in it's nature to the extreme.

Congrats to nintendo!