Wall St. Watchdog reveals information about companies for which stock analysts either upgraded or downgraded the shares on January 19th.

Upgrades

Health Management (NYSE:HMA):  Deutsche Bank upgraded its rating on this company from Hold to Buy and changed its price target from $9.5 to $8.5.

ON Semiconductor (NASDAQ:ONNN): UBS upgraded ON Semiconductor citing improving fundamentals and benefits from the Sanyo acquisition. Price target raised to $11 from $7. UBS upgraded its rating on this company from Neutral to Buy and changed its price target from $7 to $11.

Oil States (NYSE:OIS): Howard Weil upgraded its rating on this company from Market Outperform to Focus Stock.

Sup Energy Svcs (NYSE:SPN): Howard Weil upgraded its rating on this company from Market Perform to Market Outperform and changed its price target to $41.

Neostem (AMEX:NBS): WBB Securities upgraded its rating on this company from Speculative Buy to Buy and changed its price target from $1.85 to $2.

Garmin (NASDAQ:GRMN): Canaccord Genuity upgraded its rating on this company from Hold to Buy and changed its price target to $47.5.

Golar LNG (NASDAQ:GLNG): Dahlman Rose upgraded its rating on this company from Hold to Buy and changed its price target to $50.

Terex (NYSE:TEX): Baird upgraded Terex based on relative valuation and earnings growth. Price target raised to $24 from $20.Robert W. Baird upgraded its rating on this company from Neutral to Outperform and changed its price target from $20 to $24.

Downgrades

Xilinx (NASDAQ:XLNX): Target raised to $41 from $38. Deutsche Bank downgraded its rating on this company from Buy to Hold and changed its price target from $34 to $38. Miller Tabak downgraded its rating on this company from Buy to Hold and changed its price target from $38 to $41.

Digital Realty Trust (NYSE:DLR): Deutsche Bank downgraded its rating on this company from Buy to Hold and changed its price target from $66 to $68.

Altera (NASDAQ:ALTR): Price target raised to $44 from $40. Miller Tabak downgraded its rating on this company from Buy to Hold and changed its price target from $40 to $44.

Toll Brothers (NYSE:TOL): UBS downgraded its rating on this company from Buy to Neutral and changed its price target to $25.

Oasis Petroleum (NYSE:OAS): UBS downgraded Oasis based on valuation. UBS downgraded its rating on this company from Buy to Neutral and changed its price target to $36.

Meritage (NYSE:MTH): UBS downgraded Meritage Homes based on relative valuation. Price target remains $19. UBS downgraded its rating on this company from Neutral to Sell and changed its price target to $19.

Lennar (NYSE:LEN): UBS downgraded Lennar based on reltaive valuation. Price target raised to $23 from $21. UBS downgraded its rating on this company from Buy to Neutral and changed its price target from $21 to $23.

KB Home (NYSE:KBH): UBS downgraded KB Home based on relative valuation. Price target remains $7. UBS downgraded its rating on this company from Neutral to Sell and changed its price target to $7.

DR Horton (NYSE:DHI): UBS downgraded D.R. Horton based on relative valuation. Price target raised to $14 from $13. UBS downgraded its rating on this company from Buy to Neutral and changed its price target from $13 to $14.

Natl Oilwell Varco (NYSE:NOV): Howard Weil downgraded its rating on this company from Focus Stock to Market Outperform.

Douglas Dynamics (NYSE:PLOW): Oppenheimer downgraded Douglas Dynamics citing concerns that the mild winter will lead to a softer 2012 selling season. Oppenheimer downgraded its rating on this company from Outperform to Perform.

Cloud Peak Energy (NYSE:CLD): FBR Capital downgraded Cloud Peak Energy citing relative valuation. FBR Capital downgraded its rating on this company from Outperform to Mkt Perform.

ADTRAN (NASDAQ:ADTN): Needham downgraded its rating on this company from Buy to Hold.

Astec Industries (NASDAQ:ASTE): Baird downgraded Astec based on valuation. Price target remains $38. Robert W. Baird downgraded its rating on this company from Outperform to Neutral and changed its price target to $38.

ArcelorMittal (NYSE:MT): HSBC Securities downgraded its rating on this company from Overweight to Neutral and changed its price target from $30 to $21.4.

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