NEW YORK (TheStreet) -- RATINGS CHANGES

Apple (AAPL) - Get Apple Inc. (AAPL) Report was upgraded to buy from hold by Societe Generale, which set a $140 price target, saying the company is seeing higher iPhone demand and will likely report another record quarter.

AutoNation (AN) - Get AutoNation, Inc. Report was upgraded to overweight from underweight by Morgan Stanley, which set a $70 price target, saying the company is investing in technology and can become a megadealer.

Brocade Communicationsundefined was downgraded to neutral by RBC Capital, which set a $12 price target, saying the company is seeing lower demand and may have to spend more to increase growth.

Centene (CNC) - Get Centene Corporation Report was upgraded to outperform from market perform by FBR Capital Markets, which set a $90 price target, saying the purchase of Health Net (HNT) adds significantly to the business.

Corning (GLW) - Get Corning Inc Report was downgraded to underperform from neutral by Bank of America/Merrill Lynch, which set a $16 price target, saying the company is seeing lower glass demand.

Edward Lifesciences (EW) - Get Edwards Lifesciences Corporation Report was upgraded to outperform by RBC Capital, which set a $185 price target, saying that TAVR and Mitral will likely drive growth over time.

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Fitbit (FIT) - Get Fitbit, Inc. Class A Report was started at market perform by William Blair, which cited valuation, saying that investors should wait for an entry point in the mid- to upper $20s.

Fitbit (FIT) - Get Fitbit, Inc. Class A Report was started with a buy rating at Deutsche Bank, which set a $50 price target, saying the company will likely continue to increase market share in the coming quarters.

Guidewire Software (GWRE) - Get Guidewire Software, Inc. Report was upgraded to buy by TheStreet Ratings. You can view the full analysis from the report here: GWRE Ratings Report.

Ingersoll-Rand (IR) - Get Ingersoll-Rand Plc (IR) Report was upgraded to buy from hold by Stifel, which set a $77 price target, saying the company is leveraged to an upcycle in domestic non-residential construction.

Marriott Vacations Worldwide (VAC) - Get Marriott Vacations Worldwide Corporation Report was downgraded to buy from neutral by MKM Partners, which set a $97 price target, saying that upside now appears to be more fully priced in.

Murphy Oil (MUR) - Get Murphy Oil Corporation Report was downgraded to underweight from equal-weight by Morgan Stanley, which cited valuation, based on a $48 price target.

Palo Alto Networks (PANW) - Get Palo Alto Networks, Inc. Report was started at overweight by JPMorgan, which set a $216 price target, saying the company has the potential to do what no other security vendor has done -- to increase revenue faster than 30% per year for more than five years in a row.

Pericom Semiconductors (PSEM) was upgraded to buy by TheStreet Ratings. You can view the full analysis from the report here: PSEM Ratings Report.

Pioneer Natural Resources (PXD) - Get Pioneer Natural Resources Company Report was upgraded to overweight by Morgan Stanley, which set a $190 price target, saying the company is best-in-class, but has lagged its peers.