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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