Investors frequently get to see the analyst upgrades and Buy ratings from Wall Street firms. What they often miss out on are the instances where analysts downgrade these stocks, particularly when it is a stock to sell or 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 today. These are this Wednesday’s top analyst downgrades and cautious research notes from Wall Street.

American Eagle Outfitters Inc. (NYSE: AEO) was downgraded to Neutral from Buy at Citigroup.

BlackBerry (NASDAQ: BBRY) was downgraded to Underperform from Market Perform at Bernstein just a day after FBR Capital Markets was positive on it; shares are indicated down about 3% early on.

Century Aluminum Co. (NASDAQ: CENX) was downgraded to Underperform from Neutral at BofA/Merrill Lynch; shares are down more than 2%.

Cliffs Natural Resources Inc. (NYSE: CLF) was downgraded to Underperform from Neutral at BofA/Merrill Lynch; shares are down almost 2%.

KLA-Tencor Corp. (NASDAQ: KLAC) was downgraded to Hold from Buy at Stifel Nicolaus.

Novo Nordisk A/S (NYSE: NVO) was downgraded to Underperform from Neutral by BNP Paribas.

Sprint Nextel Corp. (NYSE: S) was downgraded to Neutral from Outperform at Macquarie as the merger saga is becoming more finite; shares are down 3%.

Tetra Tech Inc. (NASDAQ: TTEK) was downgraded to Hold from Buy after an earnings warning by Brean Capital; shares are down 10%.

Read also: Top Analyst Upgrades and Positive Research Calls

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