Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Amazon.com (AMZN) downgraded to Sector Weight from Overweight at KeyBanc with analyst Edward Yruma saying while first quarter results were "impressive," increased competition may "dampen near-term upside." 2. U.S. Steel (X) downgraded to Underperform, price target $18 at Macquarie with analyst Aldo Mazzaferrociting a reduced earnings outlook. The analyst expects the company to miss the earnings rebound from better market conditions due to the expanded and accelerated long-term asset revitalization program that will result in production outages, higher maintenance spending, and lost sales. 3. Gigamon (GIMO) downgraded to Market Perform from Outperform at William Blair, to Neutral from Buy at Dougherty, and to Neutral from Outperform at Credit Suisse. 4. Mattel (MAT) downgraded to Hold from Buy at Argus with analyst John Staszak citing concerns about falling revenues and increasing losses. 5. Expedia (EXPE) downgraded to Hold from Buy at Stifel with analyst Scott Devitt citing valuation. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage,
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