By Saumya Vaishampayan 

U.S. stock rose Wednesday, propelling the Russell 2000 into record territory.

The Dow Jones Industrial Average advanced 108 points, or 0.6%, to 18143. The S&P 500 rose 14 points, or 0.7%, to 2110, and the Nasdaq Composite Index added 42 points, or 0.8%, to 5019.

The Russell 2000, the benchmark for small-company stocks, rose nearly 1% to 1277. The index last closed at a record on March 20, ending at 1266.37.

Traders said there was no one reason in particular for the move higher, pointing to rising oil prices, a handful of earnings reports and a weaker dollar. Lighter-than-average volumes could be exaggerating the move higher, they added.

Energy stocks in the S&P 500 rose 2.4%, notching the biggest sector gain as the price of oil continued to rise. Crude-oil futures surged 5.8% to $56.39 a barrel. Exxon Mobil Corp. and Chevron Corp. added about 23 points to the Dow's overall gain.

Investors continued to focus on first-quarter earnings. Expectations were slashed going into the reporting season as companies contended with the strong dollar and low oil prices in the period. Including results from 37 companies, S&P 500 earnings are expected to fall 5% from a year ago, according to FactSet.

"The slowdown in growth, the fall in energy prices, the weather and the West Coast port strike all have investors somewhat cautious as we go through earnings season," said Alan Gayle, director of asset allocation at RidgeWorth Investments, which has $43.5 billion under management.

In earnings news, Delta said earnings in its March quarter more than tripled, beating analyst expectations as the company benefited from lower fuel prices. The airline said it would reduce international capacity by 3% as it deals with the strong dollar. Shares rose 2.4%.

Intel Corp. shares rose 4.6%, contributing about 10 points to the Dow's overall gain. The chip maker late Tuesday reported a 3% rise in net income on overall revenue that was flat compared with the year-ago period. Intel said last month that revenue would suffer in the first quarter due to sagging sales of personal computers. A bright spot was the data center group, which posted a 19% jump in revenue.

Traders said shares of semiconductor stocks rose along with Intel. The Market Vectors Semiconductor ETF rose 2.1%.

Bank of America Corp. said Wednesday it swung to a first-quarter profit. Still, results missed analyst expectations, pushing shares down 0.7%.

Updates on monetary policy in Europe added to the positive tone. The European Central Bank kept rates unchanged, as expected, leaving its main lending rate at a record low. ECB President Mario Draghi emphasized the central bank remains committed to its bond-buying program. France's CAC 40 rose 0.7% and Germany's DAX added less than 0.1%.

"Central banks across the board still look like they're going to stay very accommodative and keep interest rates low for a long time, which equity investors like," said Chris Gaffney, president of EverBank World Markets.

Economic data on Wednesday was mixed. U.S. industrial output fell in March and posted the first quarterly decline since the recession ended. The Federal Reserve said industrial production fell 0.6% from the prior month. Economists surveyed by The Wall Street Journal had expected a 0.4% decline in industrial production. Separately, confidence among U.S. home builders rose in April.

While oil prices rose Wednesday, they remain down nearly 50% since last June. Paul Karos, senior portfolio manager at Whitebox Mutual Funds, which manages about $900 million, said he bought airline stocks earlier this year as they should benefit from low oil prices. "They have the clearest cost benefit [from low oil prices] of anybody in transports," he said. Lower oil prices are "a huge windfall for the industry," he added.

Gold futures added 0.9% to $1202.80 an ounce. The yield on the 10-year Treasury note fell to 1.894% from 1.904% on Tuesday. Yields fall as prices rise.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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