Assured Guaranty ( AGO) was downgraded to hold at TheStreet Ratings.

Broadcom ( BRCM) was downgraded at Goldman Sachs to neutral from buy. $30 price target. Mobile and wireless momentum has stalled, Goldman Sachs said.

Berry Petroleum ( BRY) was upgraded at Wunderlich to buy from hold. $50 price target. Stock has fallen to pre-acquisition levels, Wunderlich said.

Juniper ( JNPR) was downgraded at RBC Capital to sector perform from outperform. Valuation call, based on a $24 price target, RBC Capital said.

KAR Auction ( KAR) was upgraded at Bank of America/Merrill Lynch to buy from underperform. $30 price target. Volume recovery appears to be underway, BofA/Merrill said.

Lithia Motors ( LAD) was downgraded at BofA/Merrill to neutral. Valuation call, based on a $70 price target.

LKQ Motors ( LKQ) was upgraded to neutral from underperform at Bank of America/Merrill Lynch. $32 price target. Estimates were also increased, as the company is seeing higher organic sales growth.

LinkedIn ( LNKD) was upgraded at Needham to buy from hold. $280 price target. Company has several unexploited growth opportunities, Needham said.

Lowe's ( LOW) was upgraded at Canaccord Genuity to hold from sell. $48 price target. Company can continue to benefit from a housing market recovery, Canaccord Genuity said.

NetApp ( NTAP) was upgraded at Robert Baird to neutral from underperform. $44 price target. Company is cutting costs and aggressively returning cash to investors, Baird said.

Onyx Pharmaceuticals ( ONXX) was downgraded from to market perform from outperform at Leerink Swann. Valuation call, based on a $140 price target, Leerink Swann said.

Southwest Gas ( SWX) was upgraded at Brean Murray to buy from hold. $56 price target. Company has strong visibility for better earnings growth, Brean Murray said.

Sunoco Logistics ( SXL) was upgraded at UBS to buy from neutral and given a $72 price target. Distribution is increasing, and other segments will become larger cash-flow drivers.

T-Mobile ( TMUS) was upgraded at Oppenheimer to perform from underperform. Company has improved its network and is seeing lower churn, Oppenheimer said.

Tesla ( TSLA) was downgraded at Lazard Capital Markets to neutral from buy. Stock is pricing in flawless execution, Lazard Capital Markets said.

ING U.S. ( VOYA) was downgraded at J.P. Morgan to underweight from neutral. $30 price target. Outlook lackluster and excessive valuation, J.P. Morgan said.

Walker & Dunlop ( WD) was downgraded to hold at TheStreet Ratings.

Vitamin Shoppe ( VSI) was downgraded at Credit Suisse to neutral from outperform. $46 price target. Company lacks near-term catalysts, Credit Suisse said.

Stock Comments / EPS Changes

Apple ( AAPL) price target was reduced at Needham. Shares are now seen reaching $595. Company is facing increased competition, Needham said.

Rockwell Collins ( COL) price target was raised at Jefferies to $75. Purchase of ARINC changes the mix, Jefferies said. Hold rating.

Mallinckrodt ( MNK) estimates were reduced at UBS. Reflect higher SG&A and R&S expenses, said UBS. Price target is $43.

Micron ( MU) earnings estimates were raised at Citigroup. Reflect increased contribution from Elpida, said Citigroup. Price target is $19.

Nvidia estimates were cut at Citigroup. Margins will be pressured in coming quarters, said Citigroup. Price target is $15.

Regency Energy ( RGP) estimates were reduced at UBS. Estimates were cut to reflect increased capex and interest expense as well as a lower Lone Star contribution, said UBS. Price target is $28.

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This article was written by a staff member of TheStreet.