U.S. stocks posted the biggest two- day rally since 1987 after the government guaranteed $306 billion of troubled Citigroup Inc. assets and lawmakers pledged to pass another economic stimulus package.

Citigroup, which lost 60 percent of its market value last week, rebounded 58 percent after the Treasury also agreed to inject $20 billion into the company. JPMorgan Chase & Co. and Bank of America Corp. jumped more than 21 percent, catapulting the S&P 500 Financials Index to a record gain, as the government rescue boosted confidence in the banking system. Home Depot Inc. and General Electric Co. climbed more than 8 percent on speculation the stimulus will spur economic growth.

The S&P 500 surged 6.5 percent to 851.81, capping a two-day gain of more than 13 percent. The Dow Jones Industrial Average climbed 396.97 points, or 4.9 percent, to 8,443.39. The Nasdaq Composite rose 6.3 percent to 1,472.02.

(Bloomberg.com)