Here are today's top Wall Street analyst ratings where finbox.io's unbiased fair value estimates support the recommendation.Top Upgrades Guggenheim initiated coverage on Alliance Data Systems (ADS) at Buy. Shares currently have almost 30% upside.Stephens upgraded Murphy USA (MUSA) from Equal Weight to Overweight. Stock's trading at an 18% discount to fair value.Bank of America upgraded Liberty Interactive Group (QVCA) from Neutral to Buy. Ten valuation models imply that shares are 17% undervalued.Telsey Advisory Group raised its price target to $82-$84 per share for Target Corp. (TGT). Telsey currently has an Outperform rating on the stock and finbox.io's fundamental analysis agrees.Top Downgrades Bank of America reiterated its Sell rating on Autodesk (ADSK). Shares are currently trading at a large premium.Stephens downgraded Martin Marietta Materials (MLM). Ten valuation models show the stock is 23% overvalued.Stifel Nicolaus downgraded US Ecology (ECOL). Fundamentals support rating change.Wood & Company reiterated its Sell rating on Walt Disney (DIS). Twelve valuation models imply that the company currently has a negative 17% margin of safety.