US Stocks surged in morning trading on Wall Street Friday, putting benchmark indexes on track for weekly gains after several days of volatile trading.

The S&P 500 rose 31.60 points or 0.86% to 3,726.76 as of 10:3 am Eastern time. The Dow Jones Industrial Average rose 320.35 points or 1.05% to 30,744.16. The Nasdaq rose 122.48 points or 1.15% to 10,802.99.

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Technology and healthcare companies were the biggest gainers in the market. Apple rose 1.2% and Pfizer added 4.3%. Social media companies witnessed losses after Snap Inc issued a weak forecast and the Washington Post reported that Elon Musk plans to cut about three-quarters of the payroll at Twitter after he buys the company. Snap tumbled 29.2% and Twitter slid 4.3%.

The yield on the 10-year Treasury yields, which helps determine mortgage rates, remained stable at 4.24% from late Thursday. The yield on the two-year Treasury, which often tracks investors’ expectations for Fed rate action, slipped to 4.53% from 4.61%.

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Markets have been choppy in recent days. Stocks went from sharp gains early in the week to losses later in the week. The benchmark S&P 500 and other major indexes are all still moving toward weekly gains in what has been an encouraging October so far.

Investors are closely reviewing the latest round of corporate earnings as they look for more clues about how hot inflation and rising interest rates are shaping the economy. Earning reports from airlines, banks, railroad operators and others have so far released mixed financial results and forecasts.

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American Express lost 5.5% after reserving aside hundreds of millions of dollars to cover potential losses as the economy continues to deteriorate. Railroad CSX added 1.7% after reporting robust financial results.

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Investors are concerned about inflation and the Federal Reserve’s attempt to control soaring prices on everything from food to clothing by hiking interest rates aggressively. Higher interest rates tend to reduce borrowing and investments, slowing economic growth.