NEW YORK (TheStreet) -- RATINGS CHANGES

Apple (AAPL - Get 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 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 Communications (BRCM) 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 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 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 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.

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

Ingersoll-Rand (IR - Get 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 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 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 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 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.