Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Cott Corp. (COT) upgraded to Buy from Neutral at Goldman Sachs with analyst Judy Hong saying the stock has underperformed relative to its peers with no significant catalysts, and the weakness more than accounts for the potential FX headwinds. 2. Celanese (CE) upgraded to Overweight from Neutral at JPMorgan with analyst Jeffrey Zekauskas saying the company's operating performance has proven to be "surprisingly durable." 3. Medical Properties Trust (MPW) upgraded to Buy from Hold at Stifel with analyst Chad Vanacore saying the company has a "long runway for above-average growth" given a "strong" pipeline of acquisition targets, a diversifying asset base, and the "attractive" macro environment. 4. United Continental (UAL) upgraded to In-Line from Underperform at Imperial Capital with analyst Michael Derchin saying current valuations fairly reflect the company's recent strong performance and future outlook. 5. Snap (SNAP) upgraded to Buy from Hold at Summit Insights and to Neutral from Sell at UBS. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.