The Dow industrials closed above 11,000 for the first time in almost 19 months on Monday as expectations of solid first-quarter earnings spurred buying in financial, energy and industrial sectors.

Even so, some investors said stock prices already reflect lofty expectations for first-quarter results, with both the Dow and the S&P 500 near 19-month highs.

People fully expect that the earnings season is going to be very, very good, so people are trying to get in front of that, said Stephen Massocca, managing director of Wedbush Morgan in San Francisco.

News of an aid plan for Greece calmed worries about sovereign debt risk, helping sentiment on Wall Street.

Aluminum company Alcoa Inc gained 1.3 percent to $14.57 in the regular session, making it one of the Dow's top boosts on a day when aluminum prices touched an 18-month high.

After the market's close Alcoa kicked off the earnings reporting period, posting its quarterly results.

The Dow closed above 11,000 after briefly topping that level on Friday for the first time since September 2008. The S&P 500, which is up 7.2 percent since the start of the year, rose to within 1 point of the 1,200 level, a critical resistance level.

The Dow Jones industrial average <.DJI> rose 8.62 points, or 0.08 percent, to 11,005.97 -- its highest close since September 2008. The Standard & Poor's 500 Index <.SPX> climbed 2.11 points, or 0.18 percent, to 1,196.48. The Nasdaq Composite Index <.IXIC> added 3.82 points, or 0.16 percent, to 2,457.87.

S&P 500 is up 76.9 percent since hitting bottom in March 2009.

Helping to relieve worries about sovereign debt that could have repercussions through other parts of the continent, euro zone ministers signed off on a 30 billion euro ($40 billion) rescue package for Greece on Sunday. But they stressed that Athens had not yet asked that the plan to be activated.

Takeover news also underpinned the market, with power producer Mirant Corp agreeing to acquire rival RRI Energy Inc , while Palm Inc

, the smart phone maker, is reportedly looking to sell itself.

Mirant shares shot up 18.2 percent to $12.68, and RRI Energy gained 14.7 percent to $4.53. Palm shares jumped 17.1 percent to $6.04.

Other companies scheduled to report this week are Google Inc , up 1.2 percent to $572.73; General Electric Co , up 1.03 percent to $18.71, and JPMorgan Chase & Co , up 0.4 percent to $46.14.

Estimates have been raised and stock prices are a lot higher. So the real question is how much of that is really built in at this point, added Massocca.

Heavy equipment maker Caterpillar Inc rose 2.2 percent to $66.73 after a brokerage upgraded the stock.

First-quarter earnings for S&P 500 companies are expected to rise 37.1 percent from a year ago, marking the second straight positive quarter for earnings since 2007, according to data from Thomson Reuters.

(Reporting by Ellis Mnyandu; Additional reporting by Caroline Valetkevitch; Editing by Kenneth Barry)