NEW YORK ( TheStreet) -- CHANGE IN RATINGSAlexandria Real Estate Equities ( ARE) downgraded to hold at TheStreet Ratings. Assurant ( AIZ) upgraded at Goldman from Neutral to Buy, Goldman Sachs said. Company is leveraged to higher debt issuance activity. Brookdale Senior ( BKD) rated new Buy at Deutsche. $33 price target. Industry demand should continue to outpace supply. CSX ( CSX) upgraded at Bernstein to Market Perform from Underperform, Bernstein said. Valuation call, based on a $20 price target. Discover Financial ( DFS) downgraded at Argus from Buy to Hold, Argus said. Company is facing increased competition in the U.S. EQT Midstream Partners ( EQM) rated new Buy at Citigroup. $33 price target. Unique pure play on Marcellus midstream growth that still looks cheap. HFF ( HF) upgraded to buy at TheStreet Ratings. Huntington Ingalls ( HII) downgraded at Morgan Stanley from Equal-weight to Underweight, Morgan Stanley said. Stock has outperformed its peers, but the company faces margin headwinds. $35 price target. Heartland Payment ( HPY) downgraded at Stifel from Hold to Sell, Stifel Nicolaus said. Pricing will likely collapse with SME merchants. Hill-Rom ( HRC) downgraded at Morgan Stanley from Overweight to Equal-weight, Morgan Stanley said. Company is leveraged to a weaker capital spending environment. McGraw Hill ( MHP) rated new Buy at UBS. $64 price target. Prior investments and restructuring provide margin expansion opportunity. Mosaic ( MOS) downgraded at Lazard from Buy to Neutral, Lazard said. $65 price target. Company lacks near-term catalysts. Norfolk Southern ( NSC) upgraded at Bernstein to Market Perform from Underperform, Bernstein said. Valuation call, based on a $65 price target. Precision Castparts ( PCP) rated new Hold at Keybanc. Margins may already be at peak levels. PerkinElmer ( PKI) rated new Overweight at JP Morgan. $37 price target. Recent asset purchases and sales have led to reinvigorated growth. Semtech ( SMTC) upgraded at Lazard to Buy. $31 price target. Gennum deal has attractive synergies and the company is growing in emerging markets. Stratasys ( SSYS) upgraded at Craig-Hallum from Hold to Buy, Craig-Hallum said. $70 price target. Stock has pulled back, but earnings potential has increased following the Objet merger. Thoratec ( THOR) upgraded at UBS to Buy from Neutral, UBS said. $39 price target. Inexpensive given its position in an attractive growth market.