In November of 2008, the 9th Circuit held that tribal sovereign immunity extends to tribal corporations owned and operated by Indian tribes. (Click here to view original article as well as explanation of holding.)
The plaintiffs in the case (who lost on appeal) then sought certiorari to the Supreme Court in February of 2009.
On May 4th, 2009 the Supreme Court denied certiorari, leaving the 9th Circuit’s holding in place. (2009 WL 185422)