Investors often see analyst upgrades and Buy ratings from Wall Street firms, but it is frequent that they do not hear when a firm says to sell a stock. 24/7 Wall St. reviews many fresh research calls each and every day to find great ideas from value stocks to growth stocks to dividend stocks, and we have broken out the negative analyst calls today. These are this Monday’s top analyst downgrades and cautious research notes from Wall Street.

Bank of Ireland (NYSE: IRE) was downgraded to Sell from an already cautious Neutral rating at Goldman Sachs.

CVR Energy Inc. (NYSE: CVI) was downgraded to Sell from an already cautious Neutral rating at Goldman Sachs.

Micron Technology Inc. (NASDAQ: MU) was downgraded to Market Perform from Outperform at Wells Fargo.

Morgan Stanley (NYSE: MS) was downgraded to Perform from Outperform at Oppenheimer.

Moody’s Corp. (NYSE: MCO) was downgraded to Neutral from Buy at Lazard.

Occidental Petroleum Corp. (NYSE: OXY) was downgraded to Neutral from Buy at UBS.

Telecom Italia SpA (NYSE: TI) was cut to Underweight from Neutral at J.P. Morgan.

Here are the least attractive and overvalued stocks of Warren Buffett.

Tesla Motors Inc. (NASDAQ: TSLA) was given a word of caution over pricey batteries in Barron’s over the weekend; shares are down about 4% in early indications. Time Warner Inc. (NYSE: TWX) was also given some cautious valuation comments in Barron’s over the weekend as shares look fully valued.

Here are the top upgrades and stocks to buy this morning.

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