By Dan Strumpf And Saumya Vaishampayan 

Stocks pared early losses in midmorning trading, buoyed by improving third-quarter earnings and optimism over U.S. economic growth.

The Dow Jones Industrial Average slipped six points to 16799 recently, after falling as many as 75 points shortly after the open. The S&P 500 index was recently down two points, or 0.1%, to 1962. The Nasdaq Composite Index shed five points, or 0.1%, to 4479.

While global growth concerns have sent stocks swinging sharply in recent weeks, investors have recently shifted their attention to the third-quarter corporate earnings season and signs of U.S. economic improvement. As of Friday, when 208 companies of the S&P 500 had reported results, the index was on track for 5.6% earnings growth from a year earlier, according to FactSet.

That is higher than the 4.5% earnings growth expected before the reporting season began.

"The U.S. is the place to be right now," said Mike Serio, regional chief investment officer at Wells Fargo Private Bank, which manages $179 billion. "We're seeing money continue to come into the U.S., continue to go into our stock market and continue to go into our bonds."

Meanwhile, falling energy prices are also giving many companies a boost, he said, though energy producers continued to suffer Monday amid a selloff in oil prices. The S&P 500 energy index fell 2.2%. Shares of Chevron Corp. tumbled 1.3%. Exxon Mobil fell 1.3%.

Mr. Serio said the bank is keeping client portfolios focused on U.S. companies, particularly those likely to benefit from an expanding economy, like industrial and information-technology firms.

European markets also pared earlier losses. The Stoxx 600 Europe index recently fell 0.7%. Shares were lower on that side of the Atlantic despite news that the European Central Bank's stress tests showed that all but 13 of the region's leading banks have enough capital to survive another period of economic turbulence. The stress tests are part of an effort to reassure investors that European lenders are back on track.

The decline comes amid persistent skepticism among investors about the health of Europe's banks and the ability of the ECB to cope with a broader economic slowdown, said Michael O'Rourke, chief market strategist at JonesTrading.

"You could say every bank in Europe is healthy and I'm pretty sure 99 out of 100 investors would doubt that," he said.

Brazilian markets fell sharply after elections concluded Sunday showing President Dilma Rousseff winning a second term by a narrow margin. The Bovespa fell 4.6% recently.

In commodity markets, crude-oil futures fell sharply, and were recently down 1.5% at $79.75 a barrel. Gold futures inched down 0.1% to $1230.80 an ounce.

In economic news, U.S. pending sales of existing homes increased 0.3% to a seasonally adjusted index level of 105 in September from August, the National Association of Realtors said Monday. An index level of 100 is considered an average level of contract activity. The increase was smaller than expected.

Later in the week, the Federal Reserve is due to hold a two-day policy meeting starting Tuesday, with investors eagerly anticipating further guidance on the pace of interest-rate hikes. On Thursday, investors will get an update on third-quarter U.S. economic growth, expected to show growth of 3.1%.

"This is a pivotal week overall," Mr. O'Rourke said. "The amount of news we have coming out should fuel volatility in both directions."

The yield on the 10-year Treasury note fell to 2.255%. Yields fall as prices rise.

In earnings news, Merck Co. reported earnings that beat analysts' expectations, but revenue fell short. The pharmaceutical giant tightened its earnings outlook for the year by three cents on each end, and is now expecting $3.46 to $3.50 a share. It also cut the top end of its revenue forecast and now expects $42.4 billion to $42.8 billion for the year. Shares fell 1.6%.

Valeant Pharmaceuticals International Inc. said it is prepared to raise its offer for Allergan Inc. to at least $200 a share. Allergan also reported third-quarter earnings that beat expectations and raised its guidance for the year. Shares of Allergan eased 0.2%.

Shares of Twitter Inc. fell 1%. The company is due to report earnings after the closing bell.

Write to Dan Strumpf at daniel.strumpf@wsj.com and Saumya Vaishampayan at saumya.vaishampayan@wsj.com

Valeant Pharma (NYSE:VRX)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Valeant Pharma Charts.
Valeant Pharma (NYSE:VRX)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Valeant Pharma Charts.