Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Avis Budget (CAR) downgraded to Neutral from Buy at Northcoast with analyst John Healy citing valuation. 2. Affiliated Managers (AMG) downgraded to Market Perform at Keefe Bruyette. 3. Valero (VLO) and PBF Energy (PBF) were downgraded to Sector Perform from Outperform at Scotia Howard Weil. 4. Fortinet (FTNT) downgraded to Equal Weight from Overweight at Morgan Stanley with analyst Melissa Franchi saying she favors security vendors who are exposed to markets where the cloud drives higher security spending and have optimal business models for the cloud. 5. Mitel (MITL) downgraded to Sector Perform from Outperform at National Bank with the firm citing valuation. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.