Analyst Upgrades

• Polo Ralph Lauren (RL) to neutral from underperform at BofA/Merrill.
• Sigma-Aldrich (SIAL) to outperform from market perform at Leerink.
• Petrobras (PBR) to overweight from equal weight at Barclays.
• Silvercorp Metals (SVM) to buy from neutral at UBS.
• PROS (PRO) to buy from hold at Jefferies.
• Power Integrations (POWI) and Monolithic Power (MPWR) to buy from neutral at Roth Capital.
• Diodes (DIOD) to outperform from neutral at RW Baird.
• Whole Foods (WFMI) to hold from sell at Hapoalim.
• Sinclair Broadcast (SBGI) to overweight from neutral at JPMorgan.
• Sappi (SPP) to outperform from neutral at Macquarie.
• Alpha Natural (ANR) to buy from hold at BB&T.
• Watts Water (WTS) to buy from hold at Brean Murray.

"Paranoia is indeed pervasive in the marketplace today; even our ever-optimistic team has been waking up in the middle of the night," says money manager and small cap expert Jim Oberweis, Jr.

The advisor, who also published The Oberweis Report, explains, "And there's no place where that paranoia runs deeper right now than in semiconductor and renewable energy stocks. Even though these two industries are among the few that have realized significant growth, nobody cares.

"Company after company has beaten analysts' earnings estimates this quarter, only to be greeted in the stock market with a big fat yawn.

Analyst Upgrades

• JPMorgan upgraded Norfolk Southern (NSC) to overweight from neutral, citing the company's leverage to coal and position relative to peers. The firm has a $68 price target for shares.
• Benchmark upgraded Royal Dutch Shell (RDS.A) to hold from sell based on a more favorable earnings outlook and reduced dividend risk.
• UBS upgraded Costco (COST) to buy from neutral based on valuation. The firm raised its price target to $63 from $62.
• Visa (V) was upgraded to gonviction buy from buy at Goldman.
• KLA-Tencor (KLAC) was upgraded to outperform from neutral at Credit Suisse.
• Texas Instruments (TXN) was upgraded to outperform from perform at Oppenheimer.

MOST NOTEWORTHY: Today's noteworthy initiations were Monolithic Power, Emergency Medical Services, Amsurg and EnergySolutions.

• Monolithic Power (NASDAQ: MPWR) was initiated with a Buy at Am Tech, which predicted that Monolithic Power will have significant design win momentum that should result in stronger than expected revenue growth. The firm thinks the company will be able to grow 20% in its 2008, thanks to its new products and competitive prices.
  
• Emergency Medical Services (NYSE: EMS) was initiated with a Sell, target $15 at Citigroup. Citigroup believes EMS's earnings contribution from insurance releases and prior period adjustments is not sustainable.
  
• AMSurg (NASDAQ: AMSG) was initiated with a Buy, target $32 at Citigroup. Citigroup said it is positive on AMSurg given its history of FCF per share growth, low out of network exposure, little debt risk, and acquisition pipeline.
  
• EnergySolutions (NYSE: ES) was initiated with a Market Perform, target $26 at FBRC. Friedman Billings expects EnergySolutions to trade at a slight discount to peers given its leverage balance sheet and perceived slower growth.

OTHER INITIATION:

• VMWare (NYSE: VMW) initiated with a Market Weight at Thomas Weisel, based on valuation. Thomas Weisel believes VMWare is uniquely positioned to benefit from trends toward centralized IT resources, on-demand delivery and greater efficiency.
• Citrix Systems (NASDAQ: CTXS) was initiated with an Overweight, target $37 at Thomas Weisel. Thomas Weisel believes Citrix Systems is uniquely positioned to benefit from trends toward centralized IT resources and on-demand delivery given its product line that targets the data center.

MOST NOTEWORTHY: NutriSystem, Endo Pharmaceuticals, Corporate Express NV, Aventine Renewable Energy Holdings and BioFuel Energy were today's noteworthy downgrades:

• NutriSystem (NASDAQ: NTRI) was downgraded to Hold from Buy at Lazard and to Buy from Strong Buy at Broadpoint following its lowered Q3 guidance.
  
• Jefferies downgraded shares of Endo Pharmaceuticals (NASDAQ: ENDP) to Hold from Buy after Impax Laboratories (NASDAQ: IPXL) filed a Paragraph IV challenge against Opana ER yesterday to reflect the potential for a generic version of Opana ER arriving as early as 2010 and the possibility of a similar threat against Lidoderm.
  
• Corporate Express (NYSE: CXP) was downgraded to Hold from Buy at ING, as they believe the new CEO's long-term targets are overly ambitious.
  
• JP Morgan downgraded Aventine Renewable (NYSE: AVR) and BioFuel Energy (NASDAQ: BIOF) to Neutral from Overweight, citing weaker fundamentals in ethanol pricing.

OTHER DOWNGRADES:

• JP Morgan downgraded Charlotte Russe (NASDAQ: CHIC) and The Wet Seal (NASDAQ: WTSLA) to Neutral from Overweight.
  
• Goldman downgraded Monolithic Power Systems (NASDAQ: MPWR) and Hansen Natural (NASDAQ: HANS) to Neutral from Buy; Goldman removed National Semiconductor (NYSE: NSM) from its Conviction Buy List.

MOST NOTEWORTHY: MGM Mirage (MGM), USA Truck, Inc (USAK), Knightsbridge Tankers Ltd (VLCCF), Monolithic Power Systems, Inc (MPWR) and Stanley, Inc (SXE) topped out today's noteworthy upgrade list:

• Prudential upgraded shares of MGM Mirage (NYSE: MGM) to Overweight from Neutral on valuation, as the firm believes the recent weakness presents a buying opportunity.

• USA Truck Inc (NASDAQ: USAK) was raised to Equal Weight from Underweight at Stephens based on valuation.

• Jefferies upgraded shares of Knightsbridge Tankers Ltd (NASDAQ: VLCCF) to Hold from Underperform to reflect the company's five vessels now operating on long-term time charter contracts and its recent entry into the dry bulk shipping sector.

• Monolithic Power (NASDAQ: MPWR) was upgraded to Buy from Hold at Deutsche Bank following its patent win case against O2Micro International Ltd (OIIM).

• Wachovia upgraded Stanley Inc (NYSE: SXE) to Outperform from Market Perform based on its strong Q4 report and guidance...

OTHER UPGRADES:

• Cognos Inc (NASDAQ: COGN) was upgraded to Outperform from Sector Perform at Pacific Crest.

• Riverbed Technology, Inc (NASDAQ: RVBD) was raised to Overweight from Market Weight at Thomas Weisel.

• Stifel upgraded Priceline.com Inc (NASDAQ: PCLN) to Buy from Hold.

• Barrington raised X-Rite, Inc (NASDAQ: XRIT) To Outperform from Market Perform.

• Morgan Stanley raised Principal Financial Group Inc (NYSE: PFG) to Equal Weight from Underweight.

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