The Oracle of Omaha is slowly but surely unwinding his stake in Moody's Corp. (MCO). According to a regulatory filing, Warren Buffett's Berkshire Hathaway (BRK) sold 1.4 million shares, worth about $34 million, since Friday. Berkshire now has a 12% stake in Moody's, down from 13% in June.

It's possible that Moody's has simply become too high-maintenance an investment for Buffett. Back in June, The Wall Street Journal's Matt Phillips noted that the billionaire investor seemed "pretty cranky and unhappy" when called upon to testify before the Financial Crisis Inquiry Commission about Moody's role in the meltdown of 2008.

Analyst Upgrades

• Jefferies upgraded Computer Sciences (CSC) to buy from hold and raised its target to $53 from $47. The analyst said Computer Sciences' valuation has created one of the best LBO opportunities in several years and could provide a five year IRR of 25+%.
• Keefe Bruyette upgraded Comerica (CMA) to outperform from market perform, citing strength of the company's capital. The firm raised its target for shares to $44 from $43.
• RBC Capital upgraded Nokia (NOK) to outperform from sector perform and raised its price target to $14 from $12. The firm upgraded shares based on valuation, reduced execution risk on software development, and potential catalysts from new devices based on Symbian^3. RBS upgraded Nokia to buy from hold after the company named Stephen Elop as CEO.
• Allstate (ALL) was upgraded to buy from hold at Citigroup.
• Coca-Cola Enterprises (CCE) was upgraded to buy from neutral at BofA/Merrill.
• Moody's (MCO) was upgraded to overweight from neutral at Piper Jaffray.

Analyst Upgrades

• JMP Securities upgraded Hewlett-Packard (HPQ) to outperform from market perform based on valuation and checks that indicate strength in enterprise PCs, high growth geographies and light laptops. The firm has a $50 target on the stock.
• RBC Capital upgraded Rio Tinto (RTP) to outperform from sector perform, citing the company's improving growth plans and attractive risk profile.
• Goldman upgraded FormFactor (FORM) to neutral from sell, but lowered its price target to $6 from $10. The firm cites valuation for the upgrade.
• MCG Capital (MCGC) was upgraded to outperform from market perform at FBR Capital.
• CRH (CRH) was upgraded to neutral from underweight at JPMorgan.
• Melco Crown (MPEL) was upgraded to overweight from equal weight at Morgan Stanley.

On Wednesday, billionaire investor Warren Buffett was compelled to testify before the Financial Crisis Inquiry Commission. The Oracle of Omaha took a seat beside Raymond McDaniel, the CEO of Moody's Corporation (MCO), and offered a somewhat half-hearted defense of the ratings agency's business model.

When asked whether Moody's was in need of new management, Buffett noted simply, "I would say they made a mistake that virtually everybody in the country made."

Analyst Upgrades

• Susquehanna upgraded Yahoo! (YHOO) to positive from neutral. The firm, which has a $19 price target on the stock, cites the steep decline in shares for the upgrade.
• UBS upgraded Time Warner Cable (TWC) to buy from neutral. The firm believes fears regarding FCC reclassification of broadband are "overblown" and that industry fundamentals are bullish. The firm has a $57 target on the stock.
• Keefe Bruyette upgraded Stifel Financial (SF) to outperform from market perform on valuation following the recent pullback in shares. The firm has a $64 price target for the stock.
• Boeing (BA) was upgraded to conviction buy from neutral at Goldman.
• RBC Capital upgraded Southern Union (SUG) to sector perform from underperform.
• Rubicon Technology (RBCN) was upgraded to outperform from perform at Oppenheimer.

The ratings game that was played during the financial crisis was a major factor in bringing down our economy.

Here's how the game was played. Banks like Goldman Sachs (GS) would pay a rating agency to rate their securities. Moody's chief executive, Raymond McDaniel, told a Senate panel on Friday that he was not told by Goldman about the fact that hedge fund Paulson & Co. was betting against Goldman's Abacus securities. He said: "It just changes the whole dynamic -- if the person choosing it wants to blow it up."

With borrowing costs at their lowest levels since 2004, reinsurers are loading up on corporate debt in part to fund stock buybacks. The latest tally, according to Bloomberg News, is $1.34 billion in additional borrowing, with Endurance Specialty Holdings (ENH), a Bermuda-based company, recently selling $85 million in bonds. Other recent transactions include Axis Capital Holdings (AXS) and PartnerRe (PRE) each issuing $500 million in bonds and RenaissanceRe (RNR) adding $250 million to the count.

Despite all the hype and wishful thinking, retail sales, reported Thursday morning, fell in December. This came as a surprise to analysts, many of whom forecasted increases of 2% or more, though there were some calling for declines of up to 3%. The holiday season wasn't enough to overcome cautious consumer spending, which has been driven largely by an unemployment rate that remains stubbornly high at 10%.

Data from the Commerce Department released Thursday puts the decline in retail sales from November to December at 0.3%, while expectations were for an increase of 0.5%. Excluding auto sales, the drop was 0.2%, still weaker than the 0.3% increase anticipated by analysts. This decline follows an increase of 1.2% in October and 1.8% in November. In September, retail sales fell 2% from August.

Lloyd's of London is poised to take some risks in 2010. In fact, it's ready to put more than $36 billion into the insurance and reinsurance world, according to analysts at reinsurance intermediary Guy Carpenter, a division of Marsh & McLennan (MMC).

The year-over-year increase could be as high as 27% compared to 2009, with the additional capacity coming from lower risk-transfer rates for some lines of business, though much of it is being offered to compensate for the weakness of the British pound relative to stronger currencies, such as the U.S. dollar.

Analyst upgrades:

• Citigroup upgraded Robert Half (NYSE: RHI) to Hold from Sell following the company's Q2 results, believing the worst may be behind the company. Citi raised its target on shares to $24 from $18.
• Goldman upgraded AnnTaylor (NYSE: ANN) to Buy from Neutral and raised its target to $13 from $6.50, citing improved merchandising and inventories.
• Baird upgraded TrueBlue (NYSE: TBI) to Outperform from Underperform and raised its target to $12 from $9, citing the better-than-expected Q2 report and guidance, strong balance sheet, and valuation.
• F5 Networks (NASDAQ: FFIV) was upgraded to Neutral from Underperform at BofA/Merrill.
• Credit Suisse (NYSE: CS) was upgraded to Buy from Hold at Deutsche Bank.
• Sanmina (NASDAQ: SANM) was upgraded to Neutral from Underperform at Credit Suisse.

• Deutsche Bank upgraded HealthSouth (NYSE: HLS) and Rehabcare (NYSE: RHB) to Buy from Hold after raising its Post Acute Care sector view to Positive from Neutral. The firm believes volumes and margin leverage can drive better than expected Q2 results and 2009 guidance. The firm raised its target on HealthSouth shares to $16 from $12 and on Rehabcare to $28 from $19.
  
• Jefferies upgraded Moody's (NYSE: MCO) to Hold from Underperform to reflect stabilizing credit markets and its belief regulatory concerns are overstated. The firm raised its target on shares to $30 from $19.
  
• Keefe Bruyette upgraded Goldman Sachs (NYSE: GS) to Outperform from Market Perform as it finds the stock inexpensive following the better than expected results. The firm has a $195 target on shares.
• Vale (NASDAQ: VALE) was upgraded to Buy from Neutral at BofA/Merrill.
  
• CNOOC (NYSE: CEO) was upgraded to Overweight from Equal Weight at Morgan Stanley.
  
• International Game Tech (NYSE: IGT) was upgraded to Buy from Neutral at Janney Montgomery.
  

• ING upgraded Roche (OTC: RHHBY) to Buy from Hold as it believes Roche will not pay more than $100/share for Genentech (NYSE: DNA) and that the Avastin adjuvant data due April 2009 provides significant upside potential.
  
• Oppenheimer upgraded Motorola (NYSE: MOT) to Outperform from Perform on valuation as it believes sentiment is at an all-time low and the stock has limited downside. The firm set a $5 target on shares.
  
• Morgan Stanley upgraded Comerica (NYSE: CMA) to Equal Weight from Underweight citing valuation that adequately reflects credit deterioration in its commercial-heavy loan portfolio and aggressive government action.
• Cheesecake Factory (NASDAQ: CAKE) and Nucor (NYSE: NUE) were upgraded to Buy from Neutral at Goldman.
  
• Pinnacle Entertainment (NYSE: PNK) was raised to Overweight from Equal Weight at Barclays.

If you've been watching earnings this past week, or if you read last week's Week in Preview, then this coming week may leave you feeling a bit like Bill Murray in Groundhog's Day. That is, again analysts surveyed by Thomson Reuters expect earnings declines to be more frequent and deeper than earnings gains.

Motorola Inc. (NYSE: MOT), Dow Chemical Co. (NYSE: DOW), Anadarko Petroleum Corp. (NYSE: APC), IAC Interactivecorp (NASDAQ: IACI), Moody's Corp. (NYSE: MCO), Elizabeth Arden Inc. (NASDAQ: RDEN), Devon Energy Corp. (NYSE: DVN), Diebold Inc. (NYSE: DBD), Tyco International Ltd. (NYSE: TYC), United Parcel Service (NYSE: UPS), Cisco Systems Inc. (NASDAQ: CSCO), Polo Ralph Lauren Corp. (NYSE: RL), ITT Corp. (NYSE: ITT), and Walt Disney Co. (NYSE: DIS) are scheduled to report quarterly results this week, and they're all expected to report double-digit declines in earnings.

But again this week, let's take a look who Wall Street feels may have done well in the past quarter.