NEW YORK (TheStreet) -- RATINGS CHANGES

Kroger (KR) was initiated with a sector perform rating at RBC Capital. Valuation call, based on a 12-month price target of $77, RBC Capital said.

Medidata (MDSO) was downgraded at Jefferies to hold from buy. Valuation call, based on a 12-month price target of $55, Jefferies said.

Newmont Mining (NEM) was upgraded at Bank of America/Merrill Lynch to neutral. Twelve-month price target is $29. Company can generate strong free cash flow, Bank of America/Merrill Lynch said.

Petrobras (PBR) was downgraded to sell at TheStreet Ratings. You can view the full analysis from the report here: PBR Ratings Report.

Power REIT (PW) was downgraded to sell at TheStreet Ratings. You can view the full analysis from the report here: PW Ratings Report.

Whole Foods (WFM) was initiated with a sector perform rating at RBC Capital. Twelve-month price target is $54. Store productivity is declining and sales growth is decelerating, RBC said.

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