Noble (NE) was downgraded at Morgan Stanley to equal-weight. Twelve-month price target is $42.50. Company is facing headwinds, Morgan Stanley said.

Quintiles (Q) was upgraded at Goldman Sachs to buy. Twelve-month price target is $58. Stock is not factoring in recent bookings growth, which could lead to accelerating revenue and earnings growth, Goldman said.

Questar (STR) was upgraded to buy at TheStreet Ratings.

SolarCity (SCTY) was downgraded at J.P. Morgan to neutral. Valuation call, J.P. Morgan said.

Schlumberger (SLB) was upgraded at Credit Suisse to outperform from neutral. Twelve-month price target is $108.

Sandisk (SNDK) was downgraded at Bank of America/Merrill Lynch to underperform. Twelve-month price target is $65. Company has a weaker earnings outlook, BofA/Merrill said.

Tibco (TIBX) was downgraded at Wedbush to neutral from outperform. Valuation call, based on a 12-month price target of $25, Wedbush said.

TJX (TJX) was downgraded at Sterne Agee to neutral from buy. Valuation call, based on a 12-month price target of $66, Sterne Agee said.

T. Rowe Price (TROW) was downgraded at Citigroup to neutral from buy. Fund closures and manager turnover will likely affect the flow recovery, Citi said.

ExxonMobil (XOM) was downgraded at Bank of America/Merrill Lynch to neutral. Twelve-month price target is $106. Company faces production headwinds, BofA/Merrill said.

Twitter TWTR was initiated with buy rating at Stifel Nicolaus. Twelve-month price target is $75. Strategic value, business model flexibility and earnings momentum will help move the stock higher, Stifel Nicolaus said.

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