- Tech giants rally: Nvidia surged after unveiling a $100 billion OpenAI investment, and Microsoft topped Q2 forecasts while pledging a $30 billion AI buildout in the UK Finviz Insidermonkey. Oracle, Broadcom, AMD and other chip/cloud leaders also climbed on booming AI demand Reuters.
- Big partnerships: Alibaba jumped ~10% after announcing a new trillion-parameter AI model “Qwen3-Max” and a partnership with Nvidia to expand global AI data centers Reuters. Boeing’s defense unit agreed to use Palantir’s AI platform in production lines, lifting PLTR shares about 2% on the news Reuters Reuters.
- Market flows & ETFs: U.S. equity funds saw roughly $12 billion of inflows (week to Sept 24) after the Nvidia/OpenAI announcement Reuters. AI-focused funds and tech ETFs led gains. For example, KraneShares’ AGIX ETF (AI & Technology) was added to LPL Financial’s no-fee platform, broadening access Kraneshares. Retail investing is also shifting: about half of surveyed investors say they would use AI tools like ChatGPT to pick stocks, and 13% already do Reuters.
- Expert caution and forecasts: Analysts warn of sky-high spending with uncertain payoffs. Bain & Co. estimates roughly $500 billion/year must be invested in data centers (needing ~$2 trillion annual AI revenue by 2030), far above current returns Nasdaq. A recent MIT study found 95% of firms have seen no ROI from AI so far Reuters. Rising Treasury yields also threaten to slow the AI investment binge by making massive capex projects more expensive Reuters Reuters.
- Global AI race & regulation: Geopolitics loom large. The UAE is rapidly building AI infrastructure – its president met OpenAI’s Sam Altman on Sept 27 to deepen cooperation, even as the UAE plans one of the world’s largest AI data centers and an Arabic AI model Reuters Reuters. Meanwhile, the US-China tech tug-of-war continues (US export curbs on AI chips, China pushing a global AI governance framework) Reuters Reuters.
The late-September surge left US indexes near record highs on renewed AI optimism. “There needs to be a catalyst for stocks to move materially higher,” notes Oliver Pursche of Wealthspire Advisors, warning that stretched valuations mean markets may be ignoring potential headwinds Reuters. Dan Moczulski of eToro cautions retail investors: “The risk comes when people treat generic models like ChatGPT or Gemini as crystal balls” Reuters. Even OpenAI’s CEO Sam Altman has admitted the AI industry faces “bubble fear” despite explosive revenue growth Nasdaq.
In short, AI-focused stocks and funds have drawn massive investor attention and flows, driven by big announcements and aggressive capex plans. But many experts point out that the outsized spending plans (trillions over the decade) may take years to pay off Reuters Nasdaq. For now, the market ride goes on – but analysts warn it could be volatile. Investors would do well to heed both the bullish momentum and the skeptics asking tough questions about future returns.
Sources: Latest news from Reuters, company releases and financial commentary on Sept 27–28, 2025 Reuters Reuters Reuters Reuters Reuters Nasdaq Finviz Reuters Reuters, etc.
