RATINGS CHANGES

Ambarella (AMBA - Get Report) was downgraded to sector weight at Pacific Crest.

BlackBerry (BBRY) was downgraded to market perform and assigned an $11 price target at Raymond James.

Hess (HES - Get Report) was downgraded to neutral and assigned a $58 price target at Goldman Sachs.

Intuitive Surgical (ISRG - Get Report) was downgraded to hold and assigned an $870 price target at Canaccord.

McKesson (MCK - Get Report) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: MKC.

Marvell Technology (MRVL - Get Report) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: MRVL.

Occidental Petroleum (OXY - Get Report) was initiated with a neutral rating and $69 price target at MUFG.

PVH Corp. (PVH - Get Report) was upgraded to outperform and assigned a $136 price target at Credit Suisse.

Simon Property Group (SPG - Get Report) was upgraded to buy at Mizuho.

Symantec (SYMC - Get Report) was upgraded to overweight and assigned a $38 price target at Barclays.

Tesoro (TSO) was upgraded to overweight at Morgan Stanley.

Valero Energy (VLO - Get Report) was downgraded to equal-weight at Morgan Stanley.

Whiting Petroleum (WLL - Get Report) was downgraded to sell and assigned a $7.25 price target at Goldman Sachs.

Cimarex (XEC - Get Report) was downgraded to neutral and assigned a $133 price target at Goldman Sachs.

Zynga (ZNGA - Get Report) was upgraded to overweight and assigned a $4 price target at Piper Jaffray.

This article was written by a staff member of TheStreet.