Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Lamb Weston (LW) upgraded to Buy from Neutral at Goldman Sachs with analyst Adam Samuelson saying the shares offer an "attractive valuation risk/reward," after declining 18.6% year-to-date. 2. TripAdvisor (TRIP) upgraded to Buy from Hold at SunTrust with analyst Naved Khan noting that the market valuation is placing more emphasis on the company's EBITDA multiple of the slower-growing Core business, even though its Experiences segment has generated annual growth of over 30% and now represents nearly a third of total sales. 3. Six Flags (SIX) upgraded to Outperform from Neutral at Wedbush with analyst James Hardiman stating believes that a number of potential catalysts line up nicely for the company, most notably Per-Capita spending improvements driven by the Membership 2.0 program, positive news flow from the company's international business and easy weather comparisons. 4. National CineMedia (NCMI) upgraded to Outperform from Neutral at Wedbush with analyst Michael Pachter saying he is less concerned about reserved seating driving later arrivals as the company has shown that it can recoup ad dollars elsewhere. 5. U.S. Steel (X) upgraded to Buy from Sell at Vertical Group with analyst Gordon Johnson after the company did the "unthinkable" and idled two U.S. plants and one in the EU. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.