The Dow Jones Industrial Average and the tech-heavy Nasdaq Composite Index both rose 0.3 percent, while the broad-based S&P 500 Index rose 0.4 percent.
SK Hynix is already listed in South Korea, and on Friday the share was also listed in the US. During the day, it rose around 13 percent to just over $168.
Facebook owner Meta performed strongly, rising 6.0 percent.
Delta Air Lines' quarterly report exceeded analysts' expectations, but the stock still fell and closed down 1.8 percent.
The price of a barrel of North Sea oil has fallen slightly and is around $76.
What do you think?