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Top Analyst Upgrades & Downgrades (AMD, AXP, APO, BPI, COF, LNG, CQP, JCP, LTD, LNKD, MM, NWSA, NCT, NTRS, LUV, STT, AMTD, TIVO, TROW, TSN, AAPL, PCX, ANR, CNX)

Source: Jon Ogg
These are some of the top analyst upgrades, downgrades and initiations seen in Wall Street research calls this Tuesday.

Advanced Micro Devices. Inc. (NYSE: AMD) Maintained Neutral and cut target to $6 at Credit Suisse; Maintained Buy but cut estimates at Canaccord Genuity.

American Express Company (NYSE: AXP) Raised to Buy at Nomura.

Apollo Global Management LLC (NYSE: APO) Started as Buy and $16 target at Argus.

Bridgepoint Education (NYSE: BPI) Cut to Market Perform at William Blair.

Capital One Financial Corp. (NYSE: COF) Cut to Neutral at Nomura.

Cheniere Energy (NYSEMKT: LNG) Started as Equal-weight at Barclays.

Cheniere Energy Partners (NYSEMKT: CQP) Started as Underweight at Barclays.

JC Penney (NYSE: JCP) Maintained Neutral and Cut estimates at Credit Suisse.

Limited Brands Inc. (NYSE: LTD) Cut to Hold at Argus.

LinkedIn Corporation (NASDAQ: LNKD) Maintained Buy with $135 target at Canaccord Genuity.

Millennial Media Inc. (NYSE: MM) Started as Outperform at Oppenheimer.

News Corp. (NASDAQ: NWSA) Maintained Hold at Argus.

Newcastle Investment Corp. (NYSE: NCT) Started as Outperform with $7.50 target at Credit Suisse.

Northern Trust Corporation (NASDAQ: NTRS) Raised to Buy at Goldman Sachs

Southwest Airlines Co. (NYSE: LUV) Raised to Buy at Stern Agee.

State Street Corporation (NYSE: STT) Cut to Neutral at Goldman Sachs.

TD Ameritrade Holding Corporation (NYSE: AMTD) Cut to Sell at Goldman Sachs.

Tivo Inc. (NASDAQ: TIVO) Started as Overweight at Barclays.

T. Rowe Price (NASDAQ: TROW) Raised to Buy at BofA/ML.

Tyson Foods Inc. (NYSE: TSN) Cut to Neutral at JPMorgan.

David Einhorn on CNBC called Apple Inc. (NASDAQ: AAPL) an extremely undervalued company which could be worth $1 trillion.

Nomura changes to Coal Sector: Patriot Coal Corp. (NYSE: PCX) maintained as Reduce with $5 target on bankruptcy; beneficiary companies include Alpha Natural Resources (NYSE: ANR) and CONSOL Energy (NYSE: CNX).

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JON C. OGG