Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Juno Therapeutics (JUNO) downgraded to Sell from Neutral at BTIG with analyst Dane Leone saying that the company's treatment for CD19 and hematologic malignancies is on track to hit the market later than competing products, while there is no "demonstrated proof" that Juno will have any advantages in the areas of efficacy or toxicity. 2. National Grid (NGG) downgraded to Sell from Hold at Deutsche Bank with analyst James Brand saying the company's sustainable equity cash flow yield could drop below 6% after its next regulatory review. 3. BHP Billiton (BHP) downgraded to Hold from Buy at Jefferies with analyst Christopher LaFemina saying he believes the balance sheet recap trade in mining as well as the Chinese stimulus-driven recovery in demand is over. 4. Lear (LEA) downgraded to Underweight from Equal Weight at Morgan Stanley with analyst Adam Jonas saying he expects Lear's earnings to peak this year and to fall by 20% by 2021 and expects Electrical business margins to disappoint investors due to higher development costs, increased competition, and potential lost market share. 5. Hawaiian Holdings (HA) downgraded to Hold from Buy at Deutsche Bank with analyst Michael Linenberg saying the valuation is near full following the recent rally. The analyst raised his price target for the shares to $64 from $63. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.

JPMorgan lowered the firm's price target on BHP Group to 2,650 GBp from 2,700 GBp and keeps a Neutral rating on the shares.