These are the stocks likely to make notable moves Monday: Decliners Biogen Idec Inc. BIIB, -2.18% has been downgraded to hold from buy by Stifel NicolausTickers to Watch Tenet Healthcare Corp. THC, +4.78% gained 1.4% ahead of the bell on news the company is creating a $2.6 billion joint venture with United Surgical Partners International. Shares of Carnival Corp. CCL, -2.15% lost 2.4% after Deutsche Bank cut the cruise operator to hold from buy, with the analysts saying they only see 5% upside to their 34-pound ($50.60) target price. Gilead Sciences Inc. GILD, -2.73% dropped 3.7% after the drug maker on Fridaywarned health-care providers that nine patients taking its hepatitis C drugs Harvoni or Sovaldi along with the heart treatment amiodarone developed abnormally slow heart beats and one died of a heart attack, according to Bloomberg. Pfizer Inc. PFE, +0.09% inched 0.2% lower, shaking off a price-target lift from Jefferies ($42 to $45), which is predicting shares should “significantly appreciate” over the next one to two years. MarketWatch