Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Boeing (BA) upgraded to Neutral from Underperform at BofA/Merrill with analyst Ronald Epstein citing stronger free-cash-flow generatoin and the impact from large share buybacks. 2. Vertex (VRTX) upgraded to Buy from Neutral at Janney Capital, to Outperform from Market Perform at Raymond James and Cowen, and to Overweight from Equal Weight at Barclays. 3. Chipotle (CMG) upgraded to Outperform from Market Perform at Telsey Advisory with analyst Bob Derrington saying yesterday's pullback in shares, combined with management's more aggressive menu innovation plan, provides a buying opportunity. 4. TripAdvisor (TRIP) upgraded to Market Perform from Underperform at Cowen. 5. First Solar (FSLR) upgraded to Buy from Hold at Axiom with analyst Gordon Johnson II saying that his checks suggest the company has delayed its transition to Series 6 technology as it runs its Series 4 production lines longer to accommodate increased demand. 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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