Concerns about AI have stopped this market rally and pressured the S&P 500, which continued (and got worse) last week, and that is a near-term threat to the market. There are specific headlines that kicked off this latest bout of AI anxiety, starting two Thursdays ago with the Market Dow, tech, and the broader market.
The 10/19/2026 Financial Times article reported that OpenAI revenue wasn't growing as fast as expected. That continued last week with the revelation that Core Weave (CRWV) debt had declined (Core Weave rents out massive clusters of NVIDIA graphics processing units to train, run, and scale artificial intelligence models) and was now trading near distressed levels.
Finally, on Friday, the report that Anthropic's IPO would be 25% smaller than expected ($1.5 trillion vs. $2.0 trillion) further hit tech stocks. (Anthropic is an American AI safety and research company known for building Claude models) While each of these headlines reflected a specific concern with a specific AI company, they all had a common concern: That AI-related cap-ex, which is supporting earnings growth and broader economic growth, will begin to decline. Think of it like fuel feeding an engine. In order for the engine to run faster, it must have more and more fuel. If the flow of fuel is reduced, then the engine can't run as fast.
It's the same with AI capital expenditures (cap-ex). The rate of change matters a lot. The OpenAI revenue concern, the potential difficulty for neo-clouds (cloud and other AI companies to raise capital, and major IPOs being smaller than expected all point to a reduced flow of AI cap-ex, and that is why the tech sector is down so hard over the past 10 trading days (and why the S&P 500 rally has stalled). For that to occur, I think we'd need to see more substantial weakness in the hyperscalers such as MSFT, META, GOOGL and AMZN. These are the financially strongest companies in the AI space, and they are more insulated from the small changes in capital availability than pretty much anyone else. If AI concerns rise to the level that we're seeing substantial weakness in the major tech hyperscalers, then that's a potentially bigger problem.
Additionally, if we see other parts of the market that are not linked to AI (industrials, financials, consumer discretionary, materials) begin to fall and concerns about the economy begin to grow, that will be a bigger warning sign that the AI "bubble" may be bursting.
However, while it's caused pain in the tech space and has been a headwind on the market-cap-weighted S&P 500, it's not yet a major concern for markets. To that point, we can classify this, so far, as more of a "healthy cleansing" of some of the froth in the AI ecosystem and not a major threat to broader earnings growth or economic activity. I say that because while tech has been weak over the past 10 trading days, other parts of the market have rallied: RSP up 1.66%, XLF up 3.3%, XLY up 1%, and XLI flat, all since October 7 (the S&P 500 is down 4% over the same ô€€€time frame, with XLK down 9.0%). The point is, so far this is a rotation in the market, with some money moving from the "frothier" parts of AI into the "rest" of the market for relative safety. The key now is to monitor if this initial AI weakness begins to spread from the "riskier" parts of the AI industry to the broader market.
For now, while the tech weakness isn't pleasant and likely not over (we'll need some positive reinforcement through earnings season), it appears to be focused on the "riskier" parts of the AI industry and those most vulnerable to small changes in growth, and not a bigger indictment of the broader AI bull market (at least not yet). Looking forward, META earnings this week are the key AI event, and if META can reinforce the positive trends in the AI industry, it should help the space stabilize.
Understanding Why the 10-Year Yield Fell Last Week (This Is Important). The 10-year Treasury yield fell sharply despite the hot CPI and PPI reports last week, as concerns about an AI-driven slowdown in growth and debt issuance pressured Treasury yields (which were extended to the upside). The 10-year yield fell 14 basis points. We should note that last week's decline in the 10-year yield had virtually nothing to do with CPI and PPI. Both metrics showed inflation is a problem, and it does mean we're getting more rate hikes (in December). However, one of the significant factors in the rise in Treasury yields has been 1) Strong economic growth and 2) A surge in corporate debt issuance led to AI, which has pushed all bond yields higher (more supply of debt lowers the price/increases the yields).
The CoreWeave scare from Wednesday pressured yields for two reasons. First, if we do have some parts of the AI industry start to "blow up" (e.g., neoclouds), that will cut AI-related cap-ex and reduce economic growth. That, in turn, would boost slowdown chances, and that's positive for Treasuries. Second, if the financially weaker parts of the AI industry suddenly can't get financing/ funding, that will reduce the expected amount of debt coming to market and force some fiscal restraint throughout the AI industry, which would be positive for bonds (less supply/higher prices) and negative for yields. Those are the two reasons that the 10-year Treasury yield fell last week, when macroeconomic data implied that yields should have increased.
Looking forward, AI-related debt issuance is one of the reasons yields have risen, and if that cools or slows, a tailwind will be removed from rising yields. However, we shouldn't expect this drop to continue apace, because over time, elevated inflation is still a bigger problem for long-term yields, and for the 10-year yield to sustainably drop below 5.00%, we will need to see progress on inflation metrics.
Source: Sevens Report 10-20-26