Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Nvidia (NVDA) upgraded to Buy from Neutral at UBS with analyst Timothy Arcuri saying the 20% fiscal Q4 revenue miss preannounced and the stock drop "finally sets the stage for a new positive revision cycle starting this summer." 2. American Express (AXP) upgraded to Overweight from Neutral at Atlantic Equities. 3. BlackRock (BLK) upgraded to Buy from Hold at Jefferies with analyst Daniel Fannon saying it is benefiting from both structural shifts in investor behavior as well as secular trends and he believes the company can continue to deliver industry leading organic growth and capital return. 4. British American Tobacco (BTI) upgraded to Overweight from Neutral at Piper Jaffray with analyst Michael Lavery saying he views the stock's valuation as attractive at current levels and feels "modestly more comfortable" with Glo's patent litigation risk in Japan. 5. 3D Systems (DDD) and Stratasys (SSYS) were upgraded to Overweight from Neutral at Piper Jaffray. 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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