Here you go Naraku_Diabolos...
http://en.wikipedia.org/wiki/Rare_(company)
Direct quote...
"In September 2002, the Stamper brothers sold their 51% interest in Rare to Microsoft; following this, Nintendo sold their 49% stake in the company as well. Microsoft paid a total of $377 million for the company. Because of this, Rare is now a first-party developer for Microsoft's Xbox and its successors."