Analyst upgrades:

• UBS upgraded Apple (NASDAQ: AAPL) to Buy from Neutral and raised its target to $265 from $170, citing higher iPhone expectations, new partnerships, and likely upward revisions to Street estimates driven by gross margins.
• Wells Fargo upgraded Comcast (NASDAQ: CMCSA) to Outperform from Market Perform. The firm views a possible deal between end General Electric's (NYSE: GE) NBC Universal positively, as it thinks NBC will provide higher-margin growth for Comcast.
• Janney Montgomery upgraded Michael Baker (AMEX: BKR) to Buy from Neutral after the company completed the sale of its Energy business. The firm raised its target on shares to $46 from $40.
• Jefferies assumed coverage of Endo Pharma (NASDAQ: ENDP) and upgraded the stock to Buy from Hold. The firm cites valuation, a strong base business, and solid cash flow for the upgrade, and has a $30 target price on shares.
• Marten Transport (NASDAQ: MRTN) was upgraded to Overweight from Equal Weight at Stephens.
• U.S. Bancorp (NYSE: USB) was upgraded to Outperform from Market Perform at Keefe Bruyette.

MOST NOTEWORTHY: Armor Holdings and Cheesecake Factory were the most notable upgrades this morning.

• Lehman Brothers upgraded Armor Holdings (NYSE: AH) to Overweight from Equal Weight, following details of the President's $100B 2007 defense budget supplemental.

• Raymond James upgraded Cheesecake Factory (NASDAQ: CAKE) to Outperform from Market Perform following the company's better than expected forth quarter comps and revenues.

OTHER UPGRADES:

• Shares of Novel Inc (NASDAQ: NOVL) were upgraded to Outperform from Market Perform by JMP Securities; the firm said Novell's release of Open Enterprise Server 2 may help stop declines in the combined Netware/OES product lines.

• Jefferies upgraded shares of Endo Pharmaceuticals Hlds (NASDAQ: ENDP) to Buy from Hold, with a $35 target, to reflect improving Opana prescriptions and the resolution of the Penwest dispute, which the broker believes removes uncertainty and adds earnings visibility.

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