Wall Street opened the week in negative territory, pressured by calls from artificial intelligence industry leaders for a slowdown in the development of the technology. OpenAI ruled out a stock market listing this year, and the debate reached the White House, with Donald Trump rejecting any restraint on AI advancement.
The benchmark S&P 500 closed down 0.48% at 7,619.98 points. The industrial Dow Jones fell 0.29% to 52,421.20 points, while the tech-heavy Nasdaq shed 0.56% to close at 26,186.41 points.
Microsoft shares rose 1.97% after the company published a provisional code of conduct that will impose limits on its next generation of AI models. Other major technology companies also posted gains, with the exception of Amazon, which fell 1.26%, and Tesla, which dropped 1.77%. Alphabet gained 3.06%, Meta rose 2.71%, and Apple edged up 0.24%.
Chipmakers were among the hardest hit by the AI-driven sentiment shift. Intel slid 5.61%, Nvidia dropped 3.39%, Sandisk fell 4.98%, and AMD lost 4.40%.
A 3,800-word letter from Anthropic CEO Dario Amodei, backed by OpenAI’s Sam Altman and xAI/SpaceX’s Elon Musk, argued that the development of the most advanced AI systems must be slowed to prevent artificial intelligence from escaping human control and causing catastrophic harm. Microsoft’s AI researchers separately published a new set of guiding principles that would constrain the company’s development of cutting-edge AI models.
US President Donald Trump criticised the Anthropic CEO for calling for a slowdown, intensifying his opposition to new safeguards on the technology. Trump described public backlash against AI data centres and growing concern over advanced models as a “sick conspiracy”, adding that “the only one happy about this is China”.
Bank of America shares fell 5.14% after its CEO issued a downward forecast for the bank’s quarterly investment banking fees. Investment banking revenues are expected to reach between $1.6 billion and $1.8 billion in the third quarter, down from the $2 billion recorded in the same period last year.
The session was also marked by President Trump’s announcement of new developments in the Russia-Ukraine conflict. Trump said Ukraine and Russia had agreed to halt strikes on each other’s energy infrastructure. “Ukraine has agreed not to attack Russian energy targets. Russia has agreed to do the same,” the US president wrote on his Truth Social platform, attributing the global rise in diesel prices primarily to the war in Ukraine rather than to tensions with Iran.
Rising oil prices continued to weigh on investor sentiment.
The yield on ten-year US Treasury bonds crossed the psychologically significant 5% threshold on Monday for the first time since 2007. German ten-year Bund yields simultaneously reached their highest level since 2009, sending a dual warning signal to markets. The surge in yields is linked to rising oil prices, which are approaching $110 per barrel, heightening inflation concerns. Escalating interest rates could prove particularly burdensome for weaker economies, making it more difficult for governments, companies, and households to refinance their debt.
One of the key events of the week falls on Wednesday, when the Federal Reserve is due to announce its interest rate decision. Markets are pricing in the Fed’s first rate increase of the year.
Source: Diário Económico
Original article: https://www.diarioeconomico.co.mz/2026/09/15/mercados/wall-street-fecha-em-terreno-negativo-apos-apelos-para-travar-desenvolvimento-de-ia/
