US stocks jump, bonds swing to end Wall Street's chaotic, historic week

US stocks jumped Friday in another manic day on Wall Street, while the falling value of the US dollar and other swings in financial markets suggested fear is still high about escalations in President Donald Trump's trade war with China.

The S&P 500 rallied 1.8 per cent, after veering repeatedly between gains and losses, to cap a chaotic and historic week full of monstrous swings. The Dow Jones Industrial Average went from an early loss of nearly 340 points to a gain of 810 before settling at a rise of 619 points, or 1.6 per cent, while the Nasdaq composite jumped 2.1 per cent.

Stocks kicked higher as pressure eased a bit from within the US bond market. It's typically the more boring corner of Wall Street, but it's been flashing serious enough signals of worry this week that it's demanded investors' and Trump's attention.

The yield on the 10-year Treasury topped 4.58 per cent in the morning, up from 4.01 per cent a week ago. That's a major move for a market that typically measures things in hundredths of a percentage point. Such jumps can drive up rates for mortgages and other loans going to US households and businesses, which would slow the economy, and they can indicate stress in the financial system.

All told, the S&P 500 rose 95.31 points Friday to 5,363.36. The Dow Jones Industrial Average climbed 619.05 to 40,212.71, and the Nasdaq composite climbed 337.14 to 16,724.46.

Friday's swings came after a set of stronger-than-expected profit reports from some of the biggest US banks, which traditionally help kick off each earnings reporting season.