Berkshire Hathaway shares have climbed to an all-time high, erasing all the ground lost after Warren Buffett's surprise 2025 announcement that he would step down as chief executive. The recovery took almost 18 months and marks the stock's strongest run since the leadership transition began.

Nvidia's expanding role as a financier of artificial-intelligence infrastructure is drawing fresh scrutiny after shares of several 'neocloud' companies that rent out its chips fell sharply this week. Analysts said the slide has raised questions about whether the AI data-center boom can generate enough revenue to cover its debt-fueled growth.

Meta chief executive Mark Zuckerberg has reached an arrangement with the company to help cover the cost of a proposed California wealth tax targeting billionaires. Zuckerberg had previously said he would consider leaving the state if the levy took effect.

Apple shares are trading near record highs and closing in on Nvidia's market capitalization, putting the iPhone maker on track to reclaim the title of world's most valuable company. Upcoming quarterly earnings could be the catalyst that pushes Apple's valuation past its AI-chip rival.

Qatar has struck a deal to purchase liquefied natural gas from US exporters, the latest sign of how the Iran war is reshaping global energy markets. Security concerns around the Strait of Hormuz are pushing buyers toward alternative supply routes, benefiting American LNG producers.

The White House will ease tariffs on a range of Canadian goods, including certain machinery, from October 30, while raising duties on others such as carpets. The adjustment comes as trade friction between Washington and Ottawa continues ahead of November's midterm elections.