Investors frequently get to see the analyst upgrades and Buy ratings from Wall Street firms. What investors often do not get to see is when analyst downgrade stocks to sell or to avoid. 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. These are this Wednesday’s top analyst downgrades and cautious research notes from Wall Street.

Biogen Idec Inc. (NASDAQ: BIIB) was downgraded to Neutral from Buy at Citigroup.

Dean Foods Co. (NYSE: DF) was downgraded to Market Perform from Outperform at Sanford Bernstein.

Kinross Gold Corp. (NYSE: KGC) was downgraded to Market Perform from Outperform at Cowen & Co.

Legg Mason Inc. (NYSE: LM) was downgraded to Sell from Neutral at Goldman Sachs.

MPLX L.P. (NYSE: MPLX) was downgraded to Neutral from Buy at BofA/Merrill Lynch.

Ocean Rig UDW Inc. (NASDAQ: ORIG) was downgraded to Neutral from Outperform at Credit Suisse.

Prudential Financial Inc. (NYSE: PRU) was downgraded to Outperform from the key Top Pick at RBC Capital Markets.

Quintiles Transnational Holdings Inc. (NYSE: Q) was initiated as Underperform at Sterne Agee.

A firm called Atlantic Equities has downgraded both U.S. Bancorp (NYSE: USB) and Wells Fargo & Co. (NYSE: WFC) to Underweight from Neutral.

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

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