NEW YORK ( TheStreet) -- CHANGE IN RATINGS Akamai ( AKAM) was upgraded at DA Davidson to buy from neutral. $62 price target. Company is leveraged to growing demand for fast delivery of digital content. Alliant Techsystems ( ATK) upgraded at RBC Capital to outperform from sector perform. $122 price target. Sporting business should drive future growth, RBC Capital said. Best Buy ( BBY) was upgraded at Oppenheimer to outperform. $50 price target. Turnaround story still has legs, Oppenheimer said. Cliffs Natural ( CLF) was upgraded at Cowen to market perform from underperform. $20 price target. Investor sentiment is negative, but the company has potential catalysts on the horizon, Cowen said. Clorox ( CLX) was downgraded at Morgan Stanley to underweight from equal-weight. Slowing U.S. consumer spending and increased competitive environment, Morgan Stanley said. Valuation call, based on an $83 price target. CSX) was downgraded at RBC Capital to sector perform from outperform. Company is seeing negative trends in a number of key areas. CSX was downgraded at BMO Capital to market perform from outperform. Valuation call, BMO Capital said. $28 price target. Covanta ( CVA) downgraded at Wedbush to neutral from outperform. $23 price target. Company has limited intermediate-term earnings upside potential, Wedbush said. Enerplus ( ERF) was upgraded at RBC Capital to outperform from sector perform. Company has strong operating momentum and trades at an attractive valuation, RBC Capital said. IBM ( IBM) was downgraded at UBS to neutral from buy. Estimates were lowered as weak sales in growth markets dragged both the top and bottom line. $186 price target. NSC) was downgraded at RBC Capital to sector perform from outperform. $89 price target. Have concerns about near-term freight rate trends and continued coal concerns, RBC Capital said. Packaging Corp. ( PKG) upgraded at Wells Fargo to outperform from market perform. Estimates were also increased, as the Boise acquisition should add to earnings, Wells Fargo said. Peregrine Semiconductor ( PSMI) was downgraded to sell at TheStreet Ratings. Select Comfort ( SCSS) was downgraded at Keybanc to hold from buy. Company posted lower-than-expected quarterly results, Keybanc said. Estimates were also cut.