The Globe and Mail reports in its Thursday edition that major North American indexes closed lower on Wednesday, with the S&P 500 and the tech-heavy Nasdaq sinking to three-week lows as nagging worries about the artificial-intelligence trade weighed on tech stocks. A Reuters dispatch to The Globe says Oracle dropped 5.4 per cent after a report said the cloud company's largest data centre partner Blue Owl Capital will not back a $10-billion (U.S.) deal for its next facility. Amazon after reports said the company is in talks to invest $10-billion (U.S.) in ChatGPT maker OpenAI. Worries about the broader technology sector taking on more debt to develop artificial intelligence have discouraged risk-taking lately. AI bellwether Nvidia fell 3.8 per cent and chipmaker Broadcom dropped 4.5 per cent, sending a broader chips index down 3.9 per cent. The Dow fell 228.29 points while Nasdaq lost 418.14 points. In Toronto, the S&P/TSX Composite Index ended flat at 31,250.02 points. Earlier in the day, cannabis firm Curaleaf jumped 9.8 per cent to its highest since May, 2024, after a report said U.S. President Donald Trump is expected to sign an executive order on Thursday reclassifying the drug to ease federal restrictions.