Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. American Tower (AMT) downgraded to Neutral from Buy at UBS with analyst Batya Levi saying that after a 50% rise in the stock price over the past year, shares now trade at about 24-times expected forward AFFO - 3 standard deviations above its long term average. 2. Mammoth Energy (TUSK) downgraded to Equal Weight from Overweight at Stephens with analyst Tommy Moll citing The Wall Street Journal's indication that the DHS Inspector General's office is investigating a FEMA official involving contracts awarded to the company's Cobra subsidiary in Puerto Rico and that the FBI has opened a related criminal inquiry. 3. Camping World (CWH) downgraded to Market Perform from Outperform at BMO Capital with analyst Gerrick Johnson saying he has growing concerns that the recreational vehicle industry may be taking longer than anticipated to "right size." 4. Centennial Resource (CDEV) downgraded to Neutral from Overweight at JPMorgan while QEP Resources (QEP) was downgraded to Underweight from Neutral at JPMorgan. QEP Resources (QEP) was also downgraded to Hold from Buy at Tudor Pickering. 5. Skyworks (SWKS) downgraded to Hold from Buy at Argus with analyst Jim Kelleher citings the company's reduced Q3 guidance to account for the impact of lost business from Huawei export ban, even though he expects that business to return later this year. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.