NEW YORK ( TheStreet) -- CHANGE IN RATINGS Brocade ( BRCD) was upgraded at Pacific Crest to Sector Perform. CEO resignation increases the chances of a takeover or company breakup, Pacific Crest said. Cerner ( CERN) was downgraded at Morgan Stanley from Overweight to Equal-Weight. Bookings growth could slow down in the coming quarters, Morgan Stanley said. Cabot Oil & Gas ( COG) was upgraded at JP Morgan from Neutral to Overweight. $54.50 price target. Company can grow faster than its peers over the coming quarters, JP Morgan said. Cymer ( CYMI) was initiated with a Hold rating at Deutsche Bank. Valuation call, based on a $58 price target, Deutsche Bank said. McKesson ( MCK) was downgraded at Morgan Stanley from Overweight to Equal-Weight. Company is seeing fewer new exclusive generics, Morgan Stanley said. Molycorp ( MCP) was downgraded from Buy to Hold at Dahlman Rose. Estimates were also cut, following the recent bond offering, Dahlman Rose said. Walgreen ( WAG) was upgraded at Morgan Stanley from Underweight to Equal-Weight. ESRX overhang has been removed, but European risks remain. Morgan Stanley said. Wellpoint ( WLP) was downgraded at Morgan Stanley from Overweight to Equal-Weight. Company continues to disappoint with execution, Morgan Stanley said.