Catch up on today's top five analyst actions with this list compiled by The Fly: 1. FedEx (FDX) downgraded to Hold from Buy at Argus with analyst John Eade saying while the stock has underperformed the market and its peer group he has "low confidence" that the company's earnings power can recover in the near term as its core FedEx Express revenues and margins are sliding. 2. AquaVenture (WAAS) was downgraded to Neutral from Buy at B. Riley FBR, to Hold from Buy at Lake Street, to Sector Perform from Outperform at RBC Capital, and to Market Perform from Outperform at Raymond James. The downgrades came after the company announced yesterday that it has agreed to be acquired by Culligan for $27.10 per share in cash. 3. MannKind (MNKD) initiated with an Outperform rating and $2.50 price target at Oppenheimer. 4. Amgen (AMGN) and Regeneron (REGN) were initiated with a Market Perform at Raymond James. 5. Stemline (STML) initiated with an Overweight rating at Cantor Fitzgerald. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.