Wall Street opened higher on Monday, led by a rebound in artificial intelligence (AI) stocks as investors returned to the sector after recent volatility, while markets also assessed a planned mega share sale by South Korean chipmaker SK Hynix and an increase in oil output by OPEC+.The S&P 500 rose 0.4 per cent in early trading, while the tech-heavy Nasdaq Composite gained 0.8 per cent. The Dow Jones Industrial Average was up 85 points, or 0.2 per cent, as of 9.35 am Eastern Time.Chipmakers and AI-linked companies led the gains, with Broadcom climbing 5.7 per cent after falling more than 2 per cent in each of the previous two trading sessions. Micron Technology advanced 2.8 per cent, helping lift the broader technology sector.AI-related stocks have witnessed sharp swings in recent weeks as investors reassess whether massive spending on AI chips, infrastructure and data centres will generate returns sufficient to justify soaring valuations.Also read: Donald Trump rings NYSE and Nasdaq opening bell to launch Trump AccountsInvestor appetite for the sector is expected to face another test later this week when SK Hynix plans to raise $28 billion through a US listing on the Nasdaq. The offering would rank among the largest ever in the United States, following SpaceX’s $75 billion initial public offering last month.Shares of SK Hynix, which have more than tripled this year amid the AI rally, have also seen heightened volatility. The stock fell 14.6 per cent in Seoul on Thursday after a prolonged run-up.Meanwhile, SpaceX, which owns AI company xAI, rose 2.4 per cent ahead of its scheduled inclusion in the Nasdaq 100 index. The addition is expected to trigger purchases by index-tracking funds.Among other AI-related stocks, TeraWulf surged 16.9 per cent after announcing a 20-year agreement with Anthropic to provide data centre capacity in Kentucky. The company said the deal is expected to generate approximately $19 billion and supports its transition from bitcoin mining to high-performance computing.In commodities, oil prices edged lower after OPEC+ agreed to increase production by a combined 188,000 barrels per day in August, marking the fifth consecutive monthly output hike by the producer group. Brent crude slipped 0.1 per cent to $72.07 a barrel.US Treasury yields also eased, with the benchmark 10-year yield falling to 4.47 per cent from 4.49 per cent before Friday’s Independence Day market holiday.European and most Asian equity markets traded lower, although Hong Kong’s Hang Seng Index bucked the trend with a 1.1 per cent gain.