After a long holiday weekend, investors return to a shortened trading week with the markets looking firmly poised to make a move higher on Tuesday. With over half of the first trading month of 2015 in the books, the S&P 500 stands down 3.22% to begin the year, and positive earnings results this week may start to cut in to that deficit. 24/7 Wall St. reviews dozens of analyst research reports each morning to find new investment and trading ideas for its readers. Some analyst research reports cover new stocks to buy, and others cover stocks to sell or avoid.

Here are Tuesday’s leading analyst upgrades, downgrades and initiations from top research calls from around Wall Street.

Altria Group Inc. (NYSE: MO) was raised to Outperform from Market Perform at Wells Fargo. Shares closed Friday at $53.05.

Bank of America Corp. (NYSE: BAC) was added to the Conviction Buy list at Goldman Sachs.

Clayton Williams Energy Inc. (NYSE: CWEI) is downgraded from Neutral to from Buy at SunTrust Robinson Humphrey.

Exelon Corp. (NYSE: EXC) was raised to Outperform from Market Perform at Wells Fargo. Shares closed Friday at $37.38.

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Intel Corp. (NASDAQ: INTC) was downgraded to Market Underperform from Market Perform at JMP Securities.

Meritage Homes Corp. (NYSE: MTH) was downgraded to Underperform from Neutral at Credit Suisse.

Mobile Mini Inc. (NASDAQ: MINI) was raised to Buy from Hold at Needham.

PulteGroup Inc. (NYSE: PHM) was downgraded to Underperform from Neutral at Credit Suisse.

Ryland Group Inc. (NYSE: RYL) was downgraded to Underperform from Neutral at Credit Suisse.

SanDisk Corp. (NASDAQ: SNDK) was downgraded to Reduce or Sell from Neutral at Nomura Securities. The price target for the stock was lowered to $65 from $70. Shares closed Friday at $78.92.

Taylor Morrison Home Corp. (NYSE: THMC) is downgraded to Neutral from Outperform at Credit Suisse.

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T-Mobile US Inc. (NYSE: TMUS) was raised to Buy and added to the Conviction Buy list at Goldman Sachs. The price target for the stock was raised to $37 from $27. Shares ended trading on Friday at $29.14

Time Warner Inc. (NYSE: TWX) was downgraded to Equal Weight from Overweight at Morgan Stanley.

Viacom Inc. (NASDAQ: VIAB) was downgraded to Underweight from Equal Weight at Morgan Stanley.

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