The Dow Jones Industrial Average was up 104 points to 12,713, with 24 of its 30 components moving higher. Financial stocks led the gains among blue chips, with shares of Citigroup up 4.2%, while AIG , American Express , Bank of America and J.P. Morgan all gained more than 2%.
"I'm encouraged by market action over the past three weeks," said Ken Tower, chief market strategist at Covered Bridge Tactical. "We shrugged off the very bad data that we saw on Friday, which was very positive for the market."
The market managed to close mostly higher Friday, locking in strong weekly gains, with investors hoping that another dismal employment report and a likely economic recession is already priced into stock prices.
The S&P 500 rose 12.6 points to 1,383, and the Nasdaq Composite gained 11 points to 2,382.
Monday's attention also turns to Dow-component Alcoa , which after the close will report first-quarter results, officially kicking off earnings season.
Analysts polled by Thomson Financial expect first-quarter earnings for S&P 500 components to drop 12%. Not surprisingly, the financial sector is seen likely to perform the worst, with earnings expected to drop 60%, while energy-sector firms are seen as the best with an anticipated 28% rise.
"What we see is that first-quarter earnings will likely fall below expectations," said Tower of Covered Bridge Tactical. "The market moves on expected future growth, and if the last quarter was worse than expected, that dampens expectations going forward."
"This could be a tough reporting season," Tower said.
WaMu's relief, Microsoft's threat
Mortgage lender Washington Mutual is close to a deal to get a $5 billion injection from TPG and other investors, according to a report in The Wall Street Journal. The government was not directly involved in forging a deal, as it did in the recent purchase of Bear Stearns Cos., the report said.
WaMu shares surged as high as 32%.
Meanwhile, Microsoft threatened Yahoo with a proxy fight as well as a lower offer over the weekend. Yahoo shares fell 1.7%, while Microsoft rose 1%.
UBS rose Monday after Merrill Lynch upgraded the Swiss bank to buy from neutral.
Last week, UBS and Lehman Brothers said they had lined up investors for a combined $19 billion of new equity that they are issuing, news that helped fuel the week's stock-market advance.
Trading volumes midday Monday showed 629 million shares trading on the New York Stock Exchange, with gainers topping decliners by a margin of 9 to 5. On the Nasdaq stock market, 380 million shares traded with gainers topping decliners by 13 to 12.
By sector, energy, financials, telecoms and materials led the gains.
Crude-oil futures rose sharply, gaining 2.7% to $109 a barrel, after comments from members of the Organization of Petroleum Exporting Countries, suggesting there will be no cut in oil production.
Rising crude also gave a boost to gold, which rose $14.80, or 1.6%, to $927.80 an ounce. The dollar climbed about 0.4% against the Japanese yen and was up slightly versus the euro.
Novartis said it is going to pay Nestle $11 billion for nearly 25% of eye-care firm Alcon at a 3.5% discount to Friday's close, and both firms have an option to require Novartis to buy the remaining 52% that Nestle holds for around $28 billion.
Novartis hasn't committed to making an offer for the 23% of Alcon not held by Nestle.
Kinetic Concepts said it is going to pay $1.7 billion in cash for LifeCell , an 18% premium to Friday's closing price for the biosurgery firm.
Discover Financial Services said it's going to buy Diners Club Internaional from Citigroup for $165 million.
Mining stocks including BHP Billiton and Rio Tinto were stronger in Asia and European action after Korea's Posco said it would pay three times as much for coking coal to Australian miners. Goldman Sachs and Citigroup also issued bullish notes on the sector.
DryShips rose 5% after a positive Barron's article on the company.
In other overseas news, Chinese banks were given permission to buy U.S. stocks and mutual funds for the first time.
International stock markets were stronger, with both the FTSE 100 in London and the Nikkei 225 in Tokyo advancing nearly 1%.
By Nick Godt