Analyst upgrades:

• Citigroup upgraded Schlumberger (NYSE: SLB) to Buy from Hold on valuation and the company's exposure to a potential upturn in international drilling. The firm raised its target on shares to $80 from $56.
• UBS upgraded Allegheny Tech (NYSE: ATI) to Buy from Neutral and raised its target to $43 from $31 and believes the end of jet engine and other destocking will result in an initial recovery into 2010, even before an order ramp into 2011.
• Merriman upgraded Acorda Therapeutics (NASDAQ: ACOR) to Buy from Neutral based on the favorable FDA panel outcome and set a $30-$33 target range on the stock. Baird upgraded Acorda to Outperform from Neutral and raised its target to $28 from $24. Following the panel review, Baird expects Amaya to be approved in 1H10 and would be buyers into the mid/high $20s.
• Chicago Bridge & Iron (NYSE: CBI) was upgraded to Buy from Neutral at Goldman.
• PG&E (NYSE: PCG) was upgraded to Buy from Neutral at UBS.
• Newfield Exploration (NYSE: NFX) was upgraded to Outperform from Market Perform at Wells Fargo.

MOST NOTEWORTHY: Oil and gas services companies, mining companies and Moody's Corporation (NYSE: MCO) were today's noteworthy upgrades:

• Morgan Keegan upgraded Natural Gas Services Group Inc (AMEX: NGS), Basic Energy Services Inc (NYSE: BAS) and Complete Production Services Inc (NYSE: CPX) to Outperform from Market Perform and Patterson-UTI Energy Inc (NASDAQ: PTEN) to Market Perform from Underperform, as the firm has a bullish outlook for drilling activity in the back half of 2007 and into 2008.
• JP Morgan upgraded shares of both Compania de Minas Buenaventu (NYSE: BVN) and Goldcorp Inc (NYSE: GG) to Overweight from Neutral on valuation.
• Moody's was upgraded to Overweight from Equal Weight at Morgan Stanley, citing increased confidence in revenue outlook and growth drivers.

OTHER UPGRADES:

• Inverness Medical Innovations Inc (AMEX: IMA) was upgraded to Buy from Hold at Stifel Nicolaus.
• Credit Suisse upgraded shares of Johnson Controls Inc (NYSE: JCI) to Outperform from Neutral, citing growth outlook in the company's building efficiency business.
• Allianz SE (NYSE: AZ) was upgraded to Buy from Add at WestLB on valuation and the company's strong Q1 results.