Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. SunPower (SPWR) downgraded to Neutral from Overweight at JPMorgan, to Perform from Outperform at Oppenheimer, to Hold from Buy at Deutsche Bank, to Neutral from Buy at Janney Capital, to Neutral from Outperform at Credit Suisse, and to Market Perform from Outperform at Avondale. 2. Noble Corp. (NE) downgraded to Sell from Hold at Argus with analyst David Coleman saying the company is being hurt by declining offshore drilling activity, lower fleet utilization and falling day rates. 3. Wayfair (W) downgraded to Neutral from Buy at Goldman and to Neutral from Buy at BofA/Merrill. 4. Buffalo Wild Wings (BWLD) downgraded to Market Perform from Outperform at Raymond James with analyst Brian Vaccaro saying shares are fairly valued in the context of below average comp visibility in the near-term and largely discount the benefits of near-term potential activist proposals. 5. Myriad Genetics (MYGN) downgraded to Equal Weight from Overweight at Barclays, to Neutral from Overweight at Piper Jaffray, to Market Perform from Outperform at Wells Fargo, and to Hold from Buy at Gabelli. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.