Stocks are challenging new all-time highs each week now, and investors have to be considering which stocks to buy and which ones to sell. 24/7 Wall St. reviews many fresh research reports and notes each morning of the week, on the hunt for new ideas, from value stocks to growth stocks to dividend stocks. These are this Tuesday’s top analyst upgrades, initiations and positive analyst research calls seen from Wall Street.

Allstate Corp. (NYSE: ALL) was reiterated as Buy and the target price was raised to $60 from $57 (versus a $53.18 close) with higher earnings estimates at Argus.

BlackBerry Ltd.(NASDAQ: BBRY) was raised to Hold from Sell at Deutsche Bank. Keep in mind that BlackBerry was also on the top analyst downgrades on Tuesday. Now that its merger is off, we expect analysts to be chiming in all week long with upgrades and downgrades.

Cardinal Health Inc. (NYSE: CAH) was reiterated as Buy at Argus and the price target was raised to $73 from $65 (versus a $61.80 close) after a strong quarterly report.

Cinemark Holdings Inc. (NYSE: CNK) was started as Outperform at FBR Capital Markets.

Groupon Inc. (NASDAQ: GRPN) was reiterated Buy with a $12 target (versus a $10.57 close), ahead of its earnings report this week, at Sterne Agee.

GT Advanced Technologies Inc. (NASDAQ: GTAT) is surging by about 24% to $10.41 on news of building a plant with Apple in Arizona. GT shares were raised to Buy from Neutral at Bank of America Merrill Lynch. This also was maintained Neutral at Credit Suisse, but the price target was raised to $8 from $5 in the call.

LATAM Airlines Group S.A. (NYSE: LFL) was raised to Outperform from Neutral at Credit Suisse.

MGIC Investment Corp. (NYSE: MTG) was raised to Outperform from Market Perform at Keefe Bruyette & Woods.

SunEdison Inc. (NYSE: SUNE) was raised to Overweight from Neutral at Piper Jaffray.

UBS added six top stocks to its Alpha Preference List to outperform the market in 2014.

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