MBIA is posting a large first-quarter loss, as the struggling bond insurer took heavy charges to write down the value of certain liabilities amid continued deterioration in the credit markets.

Two longtime IBM Corp. executives are retiring, prompting the technology company to reshuffle its top ranks.

The Environmental Protection Agency is lifting a week-old ban that prevented IBM from getting new government contracts.

IBM Corp. raised the low end of its 2008 earnings outlook Tuesday and said its board of directors had authorized a continuation of its massive stock buyback program. Its shares jumped 2.7 percent.

Bond insurer MBIA Inc. said Monday it will receive a cash infusion of up to $1 billion from private equity firm Warburg Pincus to help bolster its capital reserves as it braces for mounting losses and writedowns in the fourth quarter.

IBM Corp. says it has developed a greener method for recycling precious silicon that is wasted during computer chip manufacturing.