Eight months ago, Tenet Healthcare Corp. traded for $3.67 a share and a well-known New York healthcare analyst issued a report downgrading the company stock to "under perform." The analyst predicted shares would drop to $2 and that the system would go bankrupt within three years. The same analyst has now changed his opinion of the company to "outperform" and increased his price forecast to $8 per share. Tenet's stock jumped 13 percent as a result of the assessment.