Analysts' Actions: AIG GOOG CHK EA TXN WM

NEW YORK (TheStreet) -- CHANGE IN RATINGS

Abiomed (ABMD) upgraded to buy at TheStreet Ratings.

Akorn (AKRX) rated new Buy at BofA/Merrill. $18 price target. Company operates in attractive niche areas.

Bristow Group (BRS) downgraded at Goldman to Sell from Neutral, Goldman Sachs said. $52 price target. Valuation call.

Camtek (CAMT) downgraded to hold at TheStreet Ratings.

Carnival (CCL) downgraded at Jefferies to Hold from Buy, Jefferies said. $37 price target. Valuation call.

Chesapeake Energy (CHK) downgraded at Stifel from Buy to Hold, Stifel Nicolaus said. Valuation call.

Cepheid (CPHD) rated new Overweight at JP Morgan. $47 price target. Company can generate 20% annual sales growth through 2015.

Carpenter Technology (CRS) rated new Buy at Topeka. $70 price target. Company's growth strategy continues to gain traction.

Electronic Arts (EA) downgraded at BofA/Merrill from Buy to Neutral, Bank of America/Merrill Lynch said. $15 price target. Stock is up 15% from its lows and the company lacks near-term catalysts.

MarketAxess (MKTX) downgraded at Credit Suisse from Neutral to Underperform, Credit Suisse said. Valuation call, based on a $28 price target.

Marvell Technology (MRVL) downgraded at Canaccord to Hold, Canaccord Genuity said. $9 price target. Company is losing market share.

Paccar (PCAR) downgraded at Baird to Neutral, Robert Baird said. $39 price target. Sector has performed well, despite declining fundamentals.

Sigma Aldrich (SIAL) downgraded at UBS to Neutral from Buy, UBS said. $76 price target. Valuation reflects SIAL's safe haven status.

SanDisk (SNDK) downgraded at JMP from Outperform to Market Perform, JMP Securities said. Estimates also cut, given lower demand trends.

Synnex (SNX) downgraded at Needham from Strong Buy to Buy, Needham said. $40 price target. Company is leveraged to weak consumer spending and pricing pressure.

Texas Instruments (TXN) downgraded at Oppenheimer to Perform from Outperform, Oppenheimer said. Wireless strategy shift.

Waste Connections (WCN) rated new Buy at Keybanc. $37 price target. Company is market leader and deserves a premium valuation.

Waste Management (WM) rated new Hold at Keybanc. Do not expect a material waste volume recovery in the near term.

STOCK COMMENTS / EPS CHANGES

Archer Daniels Midland (ADM) estimates trimmed at Citigroup through 2013, Citigroup said. Ongoing ethanol woes. Neutral rating and $29 price target.

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