NEW YORK (TheStreet) -- RATINGS CHANGES

Actuant (ATU) was downgraded to hold from buy at Jefferies. $30 12-month price target. Earnings could struggle for a third straight year, Jefferies said.

Covanta (CVA) - Get Covanta Holding Corporation Report was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: CVA Ratings Report.

Grubhub (GRUB) - Get Grubhub, Inc. Report was initiated with an outperform rating at Oppenheimer. $42 12-month price target. The company is a category leader and deserves a premium valuation, Oppenheimer said.

Peerless Systems (PRLS) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: PRLS Ratings Report.

RPC (RES) - Get RPC, Inc. Report was downgraded to neutral from buy at Citigroup. $12 12-month price target. The company faces utilization and pricing risks, Citigroup said.

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Twitter (TWTR) - Get Twitter, Inc. Report was initiated with a perform rating and $36 12-month price target at Oppenheimer. This was valuation call, as the company trades at a steep premium to its peers, Oppenheimer said.

Unum (UNM) - Get Unum Group Report was upgraded to buy from neutral at Compass Point. $40 12-month price target. The company no longer has reserve charge overhang and deserves a higher multiple, Compass Point said.

Wesco Aircraft (WAIR) - Get Wesco Aircraft Holdings, Inc Report was downgraded to sell from hold at Deutsche Bank. $13 12-month price target. Sales headwinds are a drag on margins, Deutsche Bank said.

Worthington WOR was downgraded to hold from buy at Keybanc. The company continues to face execution issues with recent acquisitions, Keybanc said. 

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This article was written by a staff member of TheStreet.