NEW YORK (TheStreet) -- RATINGS CHANGES

Celgene (CELG - Get Report) was initiated with a buy rating at Canaccord Genuity. Twelve-month price target is $156. Revlimid should drive growth in the next several quarters, Canaccord Genuity said.

Centurylink (CTL) was downgraded at Goldman Sachs to sell from neutral. Twelve-month price target is $33. Margins and free cash flow will likely deteriorate in the coming quarters, Goldman Sachs said.

Exelon (EXC) was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: EXC Ratings Report.

Express (EXPR - Get Report) was upgraded at Piper Jaffray to overweight from neutral. Twelve-month price target is $16. Promotional activity is lower, which should boost margins, Piper Jaffray said.

Helix Energy Solutions (HLX) was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: HLX Ratings Report.

Legg Mason (LM - Get Report) was upgraded at Jefferies to buy from hold. Twelve-month price target is $67. Company is still attracting assets and can deliver consistent growth, Jefferies said.

Insulet (PODD) was downgraded at Canaccord Genuity to hold from buy. Twelve-month price target is $35. Estimates were also cut, given new patient numbers and growth trends, Canaccord Genuity said.

Rackspace (RAX) was upgraded at Pacific Crest to outperform. Company is realizing higher margins and is attractively valued, Pacific Crest said. Twelve-month price target is $58.

Waddell & Reed (WDR) was downgraded at Jefferies to hold from buy. Valuation call, based on a 12-month price target of $50, Jefferies said.

Williams-Sonoma (WSM - Get Report) was downgraded at Piper Jaffray to neutral from overweight. Twelve-month price target is $84. Expect higher promotional activity in the industry, Piper Jaffray said.

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This article was written by a staff member of TheStreet.