Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Corning (GLW) downgraded to Neutral from Buy at Goldman with analyst Doug Clark citing valuation with the stock up 33% since his upgrade back in April of 2016. The analyst keeps a $29 price target for the shares. 2. Amphastar (AMPH) downgraded to Outperform from Strong Buy at Raymond James with analyst Elliot Wilbur saying he sees an increased near-term risk profile following indications from FDA that Amphastar may have to withdraw its epinephrine product. 3. Abbott (ABT) downgraded to Market Perform from Outperform at BMO Capital. 4. GGP (GGP) downgraded to Neutral from Buy at UBS with analyst Jeremy Metz saying he does not see headwinds in the sector easing in the short term and cut his price target for GGP shares to $25 from $28. 5. Harmonic (HLIT) downgraded to Hold from Buy at Drexel Hamilton. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage,
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