NEW YORK ( TheStreet) -- CHANGE IN RATINGSAutoliv ( ALV) upgraded at Baird from Neutral to Outperform. $60 price target. Company boosted guidance, because of higher auto production. American Superconductor ( AMSC) upgraded at Jefferies from Hold to Buy. $35 price target. Valuation call, as the company is leveraged to long-term growth trends. Baidu ( BIDU) upgraded at Kaufman from Hold to Buy. $690 price target. Company could get about half of the revenue given up by Google in China. LabCorp ( LH) downgraded at Deutsche from Buy to Hold. Valuation call, based on a $81 price target. Volume trends also appear to be tracking poorly. PetSmart ( PETM) downgraded at Janney from Buy to Neutral. Stock is up 52% since last October. Quinstreet ( QNST) initiated at Credit Suisse with an Outperform rating and $21 price target. Expect strong operating growth over next several years. 2010 and 2011 EPS estimates set at $0.70 and $0.80, respectively. Tiffany ( TIF) upgraded at Jesup & Lamont from Hold to Buy. $55 price target. Company is positioned well for the return of luxury consumer spending. Williams-Sonoma ( WSM) downgraded at Citigroup from Buy to Hold. Valuation call, based on a $29 price target. Stock is already pricing in a higher operating margin.