NEW YORK ( TheStreet) -- CHANGE IN RATINGS Acxiom ( ACXM) was downgraded at BMO Capital to underperform from market perform. Valuation call, based on a $22 price target, BMO Capital said. Alliance Data ( ADS) was upgraded at BMO Capital to outperform from market perform. $240 price target. Company could see an expansion of the eBay partnership and has exposure to the growing auto sector, BMO Capital said. Align Technology ( ALGN) was downgraded at Robert Baird to neutral from outperform. Valuation call, as the stock is up 73% year to date, Baird said. Acuity Brands ( AYI) was upgraded at Sterne Agee to neutral. Estimates were also boosted, given an expected commercial construction recovery, Sterne Agee said. CHS) was downgraded at Wells Fargo to market perform from outperform. Traffic trends will likely remain weak, Wells Fargo said. Cepheid ( CPHD) was downgraded at ISI Group to sell from cautious. Valuation call, based on a $34 price target, ISI Group said. 21st Century Fox ( FOXA) was initiated with an overweight rating at J.P. Morgan. $39 price target. Impressive mix of businesses, J.P. Morgan said. HB Fuller ( FUL) was downgraded at Deutsche Bank to hold from buy. Valuation call, as the stock is up 50% over the past year, Deutsche Bank said. $50 price target. Healthsouth ( HLS) was upgraded to buy at TheStreet Ratings. Isis Pharmaceuticals ( ISIS) was initiated with a neutral rating at J.P. Morgan. $37 price target. Validated platform and attractive pipeline, but valuation is rich, J.P. Morgan said. LCC) was downgraded at CRT Capital to fair value from buy. AMR merger is facing increased legal scrutiny, CRT Capital said. Moneygram ( MGI) was upgraded at Compass Point to buy from neutral. Valuation call, based on a $23 price target, Compass Point said. Marsh & McLennan ( MMC) was downgraded at Miller Tabak to hold from buy. Revenue growth remains soft, Miller Tabak said. Mastec ( MTZ) was upgraded at DA Davidson to buy from neutral. $38 price target. Stock has pulled back to an attractive level, DA Davidson said. Micron Technology ( MU) was upgraded to buy at TheStreet Ratings. Opentable ( OPEN) was upgraded at Piper Jaffray to overweight from neutral. $80 price target. Company is just beginning to drive diner growth, Piper Jaffray said.