Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Activision Blizzard (ATVI) upgraded to Overweight from Neutral at JPMorgan with analyst Alexia Quadrani saying the stock is down 45% from an all-time high in early October, and now trades at 16.5 times forward consensus earnings, compared to 25.5 times and 23.0 times on average over the prior one and three year periods. 2. Bristol-Myers (BMY) upgraded to Outperform from Market Perform at BMO Capital with analyst Alex Arfaei saying the risk-reward on the stock at current price "seems attractive." 3. Hostess Brands (TWNK) upgraded to Overweight from Neutral at JPMorgan analyst Ken Goldman saying by this time next year, today's two major headwinds - lost business with Walmart (WMT) and the "EBITDA-hemorrhaging" Cloverhill acquisition - will be lapped and potentially become tailwinds. 4. Spirit Airlines (SAVE) upgraded to Outperform from Neutral at with analyst Jose Caiado De Sousa saying after a "massive" Q4 unit revenue guidance boost last week, the analyst sees further upside in the equity into H1 of 2019, with expected continued momentum in non-ticket revenue production amid a lower oil environment and a benign competitive backdrop. 5. Synopsys (SNPS) upgraded to Buy from Hold at Benchmark with analyst Gary Mobley citing slightly better than expected Q4 results and in-line FY19 guidance. 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 upgraded JetBlue (JBLU) to Neutral from Underweight with a $7 price target. The company is increasingly well-positioned for a modest potential move to the upside based on improving market sentiment, and its upcoming Q2 guide coming next week may exceed consensus, the analyst tells investors in a research note. JetBlue is the second least-liked airline based on sell-side ratings, after Spirit (SAVE), with short interest on the stock also remaining "stubbornly high", the firm added.