NEW YORK ( TheStreet) -- CHANGE IN RATINGS Black Hills ( BKH) was downgraded at Drexel Hamilton to sell from hold. $47 price target. Stock has been the best performer of the group and trades at a 30% premium to its peers, Drexel Hamilton said. eBay ( EBAY) was downgraded at Needham to hold from buy. Company is seeing a slowdown in its international markets, Needham said. Global Eagle Entertainment ( ENT) was upgraded to hold at TheStreet Ratings. IntraLinks ( IL) was upgraded to hold at TheStreet Ratings. Lincoln National ( LNC) was upgraded at Deutsche Bank to buy from hold. $45 price target. The interest rate environment is improving, and the company is facing fewer growth headwinds, Deutsche Bank said. Merck ( MRK) was downgraded at BMO Capital Markets to market perform from outperform. $51 price target. Januvia can face increased competition, BMO Capital Markets said. Northern Trust ( NTRS) was downgraded at J.P. Morgan to underweight from neutral. $55.50 price target. Company is facing higher expenses and realizing a lower net interest margin, J.P. Morgan said. QSII) was upgraded at Morgan Stanley to equal-weight from underweight. Clinton deal shifts focus and should help put a floor on the stock, Morgan Stanley said. Quality Systems was upgraded at J.P. Morgan to neutral from underweight. $20 price target. Board changes are a positive step, J.P. Morgan said. Elizabeth Arden ( RDEN) was downgraded at Oppenheimer to perform from outperform. Valuation call, as the stock exceeded the previous $50 price target, Oppenheimer said. SanDisk ( SNDK) was downgraded at Morgan Stanley to equal weight despite improved valuation and a new $66 price target, Morgan Stanley said. SDNK had a strong quarter and margin growth should continue, but the stock currently trades at a premium, Morgan Stanley said. XLNX) was upgraded at Lazard Capital Markets to buy. New $51 price target, based on revenue growth and margin maintenance. The introduction of China Mobile offers XLNX huge profit potential assuming that margins remain flat, Lazard Capital Markets said. Xilinx was downgraded at Wells Fargo to market perform despite increased estimates because the stock is fully priced, said Wells Fargo. Low capital requirements, high margins and revenue growth potential stand to benefit XLNX in coming quarters, Wells Fargo said.