Investors and traders constantly seek new good research-driven ideas for stocks to buy and for stocks to sell. Some of these come from independent research and some come from the large sell-side investment banking firms on Wall St. We often see ideas in value stocks and growth stocks. We also find many special situation calls. These are some of this Tuesday’s top analyst upgrades, downgrades and initiations seen from select Wall St. research calls.

ADT Corp. (NYSE: ADT) reiterated Hold with $48 target as the shares are fully valued at Argus.

Bank of America Corp. (NYSE: BAC) was given the big buy signal with $15 near-term target by Meredith Whitney after the close on Monday.

BHP Billiton PLC (NYSE: BHP) cut to Neutral at Goldman Sachs.

Chesapeake Energy Corp. (NYSE: CHK) cut to Underperform at Stern Agee.

Cigna Inc. (NYSE: CI) maintained Outperform with $72 target price at Credit Suisse.

Corning Inc. (NYSE: GLW) maintained Outperform with $15 target at Oppenheimer.

Deere & Co. (NYSE: DE) cut to Neutral at UBS.

eBay Inc. (NASDAQ: EBAY) raised to Buy with $56 target at Cantor Fitzgerald.

Electronic Arts Inc. (NASDAQ: EA) cut to Hold at Needham.

J.C. Penney Co. Inc. (NYSE: JCP) reiterated Buy with $25 target price at Argus.

Juniper Networks Inc. (NYSE: JNPR) cut to Sell at Goldman Sachs.

Lululemon Athletica Inc. (NASDAQ: LULU) cut to Neutral at Stern Agee and maintained Neutral at Credit Suisse.

Momenta Pharmaceuticals Inc. (NASDAQ: MNTA) cut to Underperform at BofA/Merrill Lynch.

OGE Energy Corp. (NYSE: OGE) cut to Hold at Argus.

RadioShack Corp. (NYSE: RSH) cut to Neutral at BofA/Merrill Lynch (FULL NOTE).

Rio Tinto PLC (NYSE: RIO) cut to Sell at Goldman Sachs.

Telefonica S.A. (NYSE: TEF) raised to Overweight at Morgan Stanley.

Transocean Ltd. Co. (NYSE: RIG) reiterated Buy with $62 target at Argus.

Unum Group (NYSE: UNM) cut to Neutral at BofA/Merrill Lynch.

Deutsche Bank gave a seriously good analysis of why it is time to rotate semiconductor stocks based on historic valuations and the market cycle.

J.P. Morgan offers a list of 15 stocks to buy based on current market conditions.

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