Analyst Upgrades

• Bristol-Myers (BMY) to hold from underperform at Jefferies.
• Pep Boys (PBY) to buy from hold at Stifel Nicolaus.
• Tesla Motors (TSLA) to overweight from equal weight at Morgan Stanley.
• Emerson (EMR) to buy from hold at Deutsche Bank.
• ARM Holdings (ARMH) to buy from neutral at BofA/Merrill.
• NetLogic (NETL) and Cavium Networks (CAVM) to buy from hold at Auriga.
• Aimco (AIV) to hold from sell at Citigroup.
• Ceragon Networks (CRNT) to overweight from equal weight at Barclays.

Analyst Upgrades

• Home Depot (HD) to buy from neutral at Goldman.
• Delta Air Lines (DAL) to buy from neutral at BofA/Merrill.
• Heico (HEI) to outperform from sector perform at RBC Capital.
• Royal Dutch Shell (RDS.A) to outperform from neutral at Credit Suisse.
• MB Financial (MBFI) to outperform from neutral at RW Baird.
• Quest Diagnostics (DGX) to equal weight from underweight at Morgan Stanley.
• Oshkosh (OSK) to neutral from underweight at JPMorgan.
• Volterra (VLTR) and Silicon Laboratories (SLAB) to buy from neutral at Roth Capital.
• Ascena Retail Group (ASNA) to overweight from neutral at Piper Jaffray.
• Cytec Industries (CYT) to buy from hold at Deutsche Bank.

Analyst Upgrades

• Heico (HEI) to outperform from market perform at FBR Capital.
• Eaton (ETN), Silgan Holdings (SLGN), MYR Group (MYRG) and Shaw Group (SHAW) to outperform from neutral at RW Baird.
• Infosys (INFY) to buy from Neutral at Nomura.
• Isle of Capri (ISLE) to buy from neutral at Merriman.
• NovaGold (NG) to sector perform from underperform at RBC Capital.
• CarMax (KMX) and Rockwell Collins (COL) to outperform from neutral at Credit Suisse.
• DHT Holdings (DHT) to overweight from neutral at JPMorgan.
• Cabot Oil & Gas (COG) to overweight from underweight at Morgan Stanley.

Results for the tech stocks in last week's preview were a mixed bag, some beats, some misses, some in line. By and large, expectations for tech companies reporting results this week remain high, though. Here's what analysts surveyed by Thomson Financial are anticipating in the way of earnings, as compared to the same period of the previous year.

• Solarfun Power Holdings Co. Ltd. (NASDAQ: SOLF): $1.48 EPS (+73.0%) on sales of $1.3 billion (+171.0%)
• Marvell Technology Group Ltd. (NASDAQ: MRVL): $0.21 EPS (+71.4%) on sales of $836.7 million (+27.4%)
• Solera Holdings Inc. (NYSE: SLH): $0.29 EPS (+51.7%) on sales of $137.0 million (+11.8%)
• Applied Signal Technology Inc. (NASDAQ: APSG): $0.14 EPS (+42.9%) on sales of $46.4 million (+17.4%)
• China Finance Online Co. Ltd. (NASDAQ: JRJC): $0.14 EPS (+42.6%) on sales of $13.3 million (+131.5%)
• OSI Systems Inc. (NASDAQ: OSIS): $0.38 EPS (+36.8%) on sales of $162.0 million (+6.0%)
• LaBarge Inc. (AMEX: LB): $0.27 EPS (+33.3%) on sales of $71.6 million (+10.4%)
• Esterline Technologies Corp. (NYSE: ESL): $0.69 EPS (+11.6%) on sales of $374.6 million (+14.8%)
• Dell Inc. (NASDAQ: DELL): $0.36 EPS (+11.1%) on sales of $15.9 billion (+7.8%)
• HEICO Corp. (NYSE: HEI): $0.46 EPS (+13.0%) on sales of $147.1 million (+10.5%)
• Daktronics Inc. (NASDAQ: DAKT): $0.17 EPS (flat) on sales of $141.5 million (+17.0%)
• Novell Inc. (NASDAQ: NOVL): $0.05 EPS (flat) on sales of $241.4 million (-0.7%)
• Omnivision Technologies Inc. (NASDAQ: OVTI): $0.29 EPS (-17.1%) on sales of $172.5 million (-0.4%)
• Sigma Designs Inc. (NASDAQ: SIGM): $0.39 EPS (-18.8%) on sales of $58.7 million (+37.9%)

MOST NOTEWORTHY: BEA Systems, Nokia, Medco Health, Quest Diagnostics and PetSmart were today's noteworthy downgrades:

• Citigroup downgraded shares of BEA Systems (NASDAQ: BEAS) to Hold from Buy on valuation following the $17/share offer by Oracle (NASDAQ: ORCL) as they think a public bidding war for the company is unlikely.
  
• ABN Amro downgraded shares of Nokia Corporation (NYSE: NOK) to Hold from Buy on valuation and believes above consensus Q3 results are already priced into shares.
  
• Wachovia downgraded Medco Health Solutions (NYSE: MHS) to Market Perform from Outperform on valuation.
  
• The firm also downgraded Quest Diagnostics (NYSE: DGX) to Market Perform from Outperform, as they believe the prospects from stabilizing volumes and cost savings are reflected in valuation and Street estimates.
  
• Credit Suisse downgraded shares of PetSmart (NASDAQ: PETM) to Neutral from Outperform citing aggressive pricing at Petco, accelerating growth initiatives, limited visibility around expense management, and lack of consistent results.

OTHER DOWNGRADES:

• Methanex Corporation (NASDAQ: MEOH) was downgraded to Sector Underperformer from Sector Performer at CIBC.
  
• Rochdale downgraded Heico Corporation (NYSE: HEI) to Neutral from Buy.
  
• JP Morgan downgraded BankUnited Financial Corp (NASDAQ: BKUNA) to Neutral from Outperform and removed Qwest Communications (NYSE: Q) from its Focus List.
  
• Goldman removed MetLife (NYSE: MET) from its Conviction Buy List.
  
• Coldwater Creek (NASDAQ: CWTR) was downgraded to Hold from Buy at Standford and at Stifel.