Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Alaska Air (ALK) upgraded to Overweight from Neutral at JPMorgan with analyst Jamie Baker saying shares of Alaska Air are a laggard year-to-date, having underperformed the market by nearly 17%. 2. Northrop Grumman (NOC) upgraded to Overweight from Neutral at Alembic Global. 3. JD.com (JD) upgraded to Overweight from Neutral at JPMorgan. 4. Noble Energy (NBL) upgraded to Equal Weight from Underweight at Barclays with analyst Jeanine Wai saying the company's fundamentals have improved. 5. Vipshop (VIPS) upgraded to Overweight from Neutral at JPMorgan with analyst Alex Yao saying he's turning more positive on Vipshop's earnings growth outlook following its strategic shift to move non-core, low-margin or loss-making categories to third parties and potentially transition in-house logistics to an outsourced model. 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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