Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. BofA Merrill Lynch analyst Tal Liani upgraded FireEye (FEYE) to Buy saying the combination of low valuation and expectations, many new solutions, and recent sales leadership changes creates significant upside potential over the next two years. The analyst believes investors under-appreciate FireEye's quality of management, recovery strategy, and the quality of its technology and solutions. 2. Morgan Stanley upgraded Welltower (HCN) to Overweight from Equal Weight and raised its price target to $73 from $65, with analyst Vikram Malhotra calling the stock his preferred play on senior housing given its premium market position and a relatively younger portfolio. 3. Tiffany (TIF) upgraded to Outperform from Market Perform by William Blair analyst Dylan Carden, citing the recent stabilization of comps sales as well as upcoming easier comparisons. 4. Illumina (ILMN) upgraded to Outperform from Market Perform at Leerink by analyst Puneet Souda , who said survey data across high-productivity labs suggest earlier than expected NovaSeq upgrades in 2017 and 2018. 5. Wedbush analyst Nick Setyan upgraded Shake Shack (SHAK) to Neutral from Underperform, saying valuation is now more in line with long-term opportunities. Setyan believes same-store-sales growth headwinds and softer new unit volumes in 2017 are now well understood and raised Shake Shack's price target to $33 from $30. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.