Analyst upgrades:

• Citigroup upgraded Cooper Industries (NYSE: CBE) to Buy from Hold on valuation as it believes commercial construction concerns are well known. The firm raised its target on shares to $40 from $37, and coupled the upgrade with a downgrade of Rockwell Automation (NYSE: ROK) to Sell from Hold.
• Credit Suisse upgraded BJ Services (NYSE: BJS) to Neutral from Underperform following its acquisition by Baker Hughes (NYSE: BHI). The firm raised its target to $17.
• Credit Suisse also upgraded Amkor Technology (NASDAQ: AMKR) to Outperform from Neutral and raised its target to $8 from $7. The firm expects Amkor to benefit from near-term strength in the supply chain and the mix shift towards higher value packaging.
• Textron (NYSE: TXT) was upgraded to Conviction Buy from Neutral at Goldman.
• Siemens (NYSE: SI) was upgraded to Neutral from Sell at UBS.
• Stanley Works (NYSE: SWK) was upgraded to Buy from Neutral at Janney Montgomery.

Rowan Companies Inc. (NYSE: RDC), a provider of international and domestic offshore contract drilling services, is recently down .33 to $37.42. RDC has been frequently mentioned as unconfirmed buyout candidate over the last 18-months. RDC has a market cap of $4.1 billion with long-term debt of $450 million. RDC has a P.E. of 12. RDC is expected to report EPS on 11/1. RDC call option volume of 4,251 contracts compares to put volume of 62 contracts. RDC October option implied volatility of 38 is above its 26-week average of 33 according to Track Data, suggesting larger risk.

Diamond Offshore Drilling (NYSE:DO) implied volatility Flat as oil trades at $83. DO, a drilling service provider to the energy industry, is recently trading down .04 to $114.01. DO has a market cap of $15.9 billion with long-term debt of $502 million. DO has a P.E. of 18. DO is expected to report EPS in late October. DO has been frequently mentioned as a potential acquirer of drilling service assets. DO October option implied volatility of 32 is near its 26-week average according to Track Data, suggesting non-directional price risk.

Option update provided by Stock Specialist Paul Foster of theflyonthewall.com.

MOST NOTEWORTHY: Amazon.com (AMZN), Luminent Mortgage (LUM), Whole Foods (WFMI), Tenet Healthcare (THC) and Pediatrix Medical (PDX) were today's noteworthy upgrades:

• Bernstein upgraded Amazon.com (NASDAQ: AMZN) to Outperform from Market Perform, citing margins on 3rd party transactions that are close to eBay's (EBAY) and that the overseas merchants initiative will increase 3rd party units to 25% of sales. The move is expected to increase operating margins to 6.2% by 2011, above the previously expected improvement of 4.6% by the same time.

• JMP Securities said Luminent Mortgage's (NYSE: LUM) $64.9M emergency financing from Arco Capital may preserve some value for shareholders, and upgraded shares to Market Underperform from Sell.

• JP Morgan added Whole Foods (NASDAQ: WFMI) to its Focus List, and expects the Wild Oats (NASDAQ: OATS) acquisition to be a catalyst for shares.

• Deutsche Bank upgraded Tenet Healthcare (NYSE: THC) to Hold from Sell.

• Matrix USA raised Pediatrix Medical (NYSE: PDX) to Buy from Hold, citing valuation...

OTHER UPGRADES:

• AGL Resources (NYSE: ATG) and Atmos Energy (NYSE: ATO) were upgraded to Buy from Neutral at Calyon.

• Rowan Co (NYSE: RDC) was upgraded to Outperform from Peer Perform at Bear Stearns.

• Goldman raised O'Reilly Automotive (NASDAQ: ORLY) to Buy from Neutral.

• BMO Capital upgraded General Mills (NYSE: GIS) to Outperform from Market Perform.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).

Diamond Offshore Drilling (NYSE: DO) volatility slightly higher as DO at record high. DO, a drilling service provider to the energy industry, closed at $113.04. RIG and GSF, drilling service providers, announced a merger of equals on 7/23. DO August option implied volatility of 36 is above its 26-week average of 33 according to Track Data, suggesting slightly larger price risk.

Ensco International (NYSE: ESV) volatility elevated as ESV at record high. ESV, an offshore contract drilling company, closed at $65.90. RIG and GSF, drilling service providers, announced a merger of equals on 7/23. ESV has a market cap of $9.8 billion with long-term debt of $308 million. ESV had March 2007 quarterly net income of $232 million on total revenue of $514 million. LYON has a $59 price target on ESV. ESV August option implied volatility of 40 is above its 26-week average of 33 according to Track Data, indicating larger price fluctuations.

Atwood Oceanics (NYSE: ATW) August implied volatility elevated as ATW at record high. ATW is engaged in the business of international offshore drilling of exploratory and developmental oil and gas wells and related support management and consulting services. ATW closed at $74.36. ATW will report EPS on August 7th. RIG and GSF, drilling service providers, announced a merger of equals on 7/23. ATW August option implied volatility of 39 is above its 26-week average of 33 according to Track Data, suggesting larger risk.

Rowan (NYSE: RDC) August volatility elevated into EPS. RDC, a provider of international and domestic offshore contract drilling services, will announce EPS on August 2nd. Morgan Keegan says: "We are lowering our estimates on RDC as we build in lower day rate assumptions and a delayed recovery for US Gulf commodity jackups." RIG and GSF, drilling service providers, announced a merger of equals on 7/23. RDC August option implied volatility of 46 is above its 26-week average of 32 according to Track Data, suggesting larger risk.

Daily Update is provided by Stock Specialist Paul Foster of theflyonthewall.com.

MOST NOTEWORTHY: Today's most noteworthy downgrades included Armor Holdings, Inc (AH), Alcan Inc (AL), Advance Auto Parts, Inc (AAP) and Reuters Group PLC (RTRSY):

• Armor Holdings Inc (NYSE: AH) was downgraded to Neutral from Overweight at JP Morgan based on the news that the company will be sold to BAE Systems PLC (BAESY) for $88 a share in cash. The firm expects the deal to close with no higher offers. Bear Stearns cut Armor Holdings to Peer Perform from Outperform and Friedman Billings cut shares of the vehicle armorer to Market Perform from Outperform.

• Alcan Inc (NYSE: AL) was cut to Neutral from Buy at Bank of America and DA Davidson following the Alcoa (AA) bid.

• Baird cut Advance Auto Parts (NYSE: AAP) to Neutral from Outperform following CEO Michael Coppola's resignation. Kevin Dann downgraded Advance to Hold from Buy to reflect an increased level of uncertainty following Mr. Coppola's departure.

• Lehman Brothers downgraded Reuters Group (NASDAQ: RTRSY) to Equal Weight from Overweight pending further information on the Thompson Corp (TOC) bid; Credit Suisse cut shares to Neutral from Outperform and Deutsche Bank cut shares to Hold from Buy.

OTHER DOWNGRADES:

• Matrix downgraded UST Inc (NYSE: UST) to Sell from Hold.

• Needham cut Entegris, Inc (NASDAQ: ENTG) to Hold from Buy.

• UBS downgraded shares of Golden Star Resources (AMEX: GSS) to Reduce from Neutral.

• Wachovia cut Rowan Cos (NYSE: RDC) to Market Perform from Outperform.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).