Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. KLA-Tencor (KLAC), Applied Materials (AMAT), and Lam Research (LRCX) were downgraded to Sell from Neutral at UBS. 2. AMD (AMD) downgraded to Market Perform from Outperform at Northland with analyst Gus Richard saying AMD shares are now ahead of the company's fundamentals. 3. Cubic (CUB) downgraded to Neutral from Overweight at JPMorgan with analyst Mark Strouse saying the company reported "mixed" fiscal Q4 results with disappointing EBITDA on stronger than expected revenue. 4. Carnival (CCL) downgraded to Hold from Buy at SunTrust with analyst Charles Scholes citing his analysis of booking trends data, noting that while volumes have improved over the past 8 weeks, the demand is driven by pricing cuts and is targeting mainly the sailings which had been impacted by the September hurricane. 5. MacroGenics (MGNX) downgraded to Underweight from Equal Weight at Morgan Stanley with analyst David Lebowitz saying based on recent data, he believes that margetuximab might be approvable, but that the drug probably has a limited market opportunity. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.