NEW YORK (TheStreet) -- RATINGS CHANGES

Clovis (CLVS) - Get Report was upgraded at Stifel Nicolaus to buy from hold. Twelve-month price target is $50. Valuation call, as the stock is down 60% from its highs, Stifel Nicolaus said.

Hi-Crush Partners (HCLP) was initiated at Jefferies with a buy rating. Compelling exposure to rising Northern White frac sand demand. Twelve-month price target is $59. Buy rating.

Life Time Fitness (LTM) - Get Report was downgraded at Piper Jaffray to neutral from overweight. Twelve-month price target is $54. Studio competition a significant headwind and current valuation accurately reflects long-term opportunity, Piper Jaffray said.

Lululemon (LULU) - Get Report was upgraded at Sterne Agee to neutral from underperform. Valuation call, following the recent pullback, Sterne Agee said. The company's store expansion plan remains intact, Sterne Agee said.

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Microsoft (MSFT) - Get Report was upgraded at FBR Capital to outperform from market perform. Twelve-month price target is $49. Company can continue to expand its cloud offerings and grow under the new CEO, FBR Capital said.

Bankrate (RATE) was upgraded at RBC Capital to outperform from sector perform. Twelve-month price target is $21. Valuation call, as the stock is down 30% from recent highs, RBC Capital said.

Twitter (TWTR) - Get Report was initiated with an outperform rating at Pacific Crest. Twelve-month price target is $45. Revenue catalysts are kicking in, Pacific Crest said.

Vector (VGR) - Get Report was initiated with an overweight rating at Oppenheimer. Twelve-month price target is $25. The firm recently increased its stake in realty company Douglas Elliman, and the stock has 23% potential upside, Oppenheimer said.

Verint (VRNT) - Get Report was upgraded at Credit Suisse to outperform from neutral. Twelve-month price target is $57. Company should continue to exceed guidance in the coming quarters, Credit Suisse said.

Whole Foods (WFM) was initiated with an outperform rating at Imperial Capital. Twelve-month price target is $48. Stock is down 40% from its recent highs, Imperial Capital said.

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Whirlpool (WHR) - Get Report was initiated with a buy rating at Sterne Agee. Twelve-month price target is $170. Replacement and discretionary demand should increase over the next two years, Sterne Agee said.

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This article was written by a staff member of TheStreet.