NEW YORK ( TheStreet) -- CHANGE IN RATINGS Big Lots ( BIG) was upgraded to buy at TheStreet Ratings. Cisco Systems ( CSCO) was upgraded at ISI Group to neutral from cautious. Valuation is improving, but need to see the low-$20's to become more constructive, ISI Group said. MDC ( MDC) was upgraded at Sterne Agee to buy from neutral. $36 price target. Valuation call, as the company has easy comps, Sterne Agee said. Medicines Company ( MDCO) was upgraded at Bank of America/Merrill Lynch. $40 price target. Company has expanded its platform and can drive revenue synergies, BofA/Merrill said. SNV) was downgraded at Drexel Hamilton to hold from buy. Valuation call, based on a $3.50 price target, Drexel Hamilton said. Suntrust ( STI) was upgraded to buy from hold at Drexel Hamilton. $40 price target. Company should increase capital distributions, Drexel Hamilton said. Teekay ( TK) was downgraded to hold at TheStreet Ratings.