What is going on in the U.S. equity market today? To what extent may it be relat

What is going on in the U.S. equity market today? To what extent may it be related to macro news?

The market is selling off broadly, and it has gotten worse since the morning. At the open it was a rotation day: tech fell while the Dow rose. Now nearly everything is down, and the Dow and small caps have turned negative too. Macro news is adding to the pressure but didn't start it. My rough split is about one-third macro and two-thirds the market rethinking how the AI buildout gets paid for. The two are linked, though: high rates are what make debt-funded AI spending look worse.

Where things stand (latest available, around 1:10 PM New York time)

How the day went: at 10:02 AM the Dow was up 387 points, or 0.8 per cent, and the majority of U.S. stocks were rising. By noon, selling pressure built through the morning and accelerated at midday. Since then the Dow has lost all of its gain, and the equal-weight S&P is down 0.6%. That means this is no longer money moving from tech into other stocks. Investors are cutting risk across the board.

What's driving it

- Paying for AI. CoreWeave has about $50 billion in debt. The cost of insuring its debt now price[s] a 60% default risk and bonds yield near 15%. Chip stocks are down for a ninth straight day: SOXX is on track for a ninth straight daily decline, the longest such streak for the fund since 2006. In Korea, the KOSPI fell 14.46% this week, its worst week since October 2008. Software and cybersecurity are also getting hit. Twilio, Okta, CrowdStrike, Palo Alto and Snowflake were each down 7% to 11% at midday, per Benzinga.

- Inflation and the Fed. September CPI came in hot: core CPI (month-over-month): 0.3% (estimate 0.2%; prior 0.3%), with headline CPI at 3.7% year over year (September 2026 vs. September 2025). Then PPI jumped 1.3% on the month and 6.3% year over year. After the CPI report, the probability of a Federal Reserve rate hike in October climbed to approximately 40%. Asked today about a hike at the October 28 meeting, Fed Chair Warsh said, "I don't prejudge meetings," rejected forward guidance, and told investors to watch the data. In other words, a hike is still possible.

- Oil and the Iran war. Shipments through the Strait of Hormuz averaged 11.62 million barrels per day in the seven days to October 13, about 68% of its 17.15 million-barrel-per-day baseline. Oil prices conflict: my feed shows November WTI up 3.0% at $98.55, while Benzinga had December WTI down 2.4% at midday. I can't confirm a midday oil spike, so I'm not counting it as a cause.

Why I don't call today mostly macro

On Thursday the 10-year yield fell about 10 bp, yet the Nasdaq only added 20.16 points, or 0.1%. Today yields are up about 4 bp and QQQ is down 2%. The tech move is far larger than the rate move would explain. Bonds are also acting as a safe haven again: German Bund yields have turned positively correlated with stocks for the first time since August, as investors worry about the financing behind the AI buildout. That pattern looks like the market starting to fear slower growth, not just higher rates.

The bigger point is that an AI spending slowdown would itself be a macro event. Macquarie's Thierry Wizman said a slowdown would weaken the USD and reduce US yields across the curve. Investors are also sorting AI companies by who can pay for their own buildout and who has to borrow. One trader put it this way: "the borrowers are behaving like rate-sensitive stocks."

What it means for your book (as of the October 3 upload)

- Concentration. By my sum from the uploaded weights, Core has about 34.8% in mega-cap tech plus XLK (AAPL, GOOG, MSFT, AMZN, NVDA, XLK, META, AVGO), and about 7.1% more in semis and chip equipment (TSM, ASML, MU, AMD, KLAC, QCOM, INTC). That's roughly 42% in one factor. On days like this, the energy names, utilities, gold and about 3.9% in cash help only a little.

- The risk sits with your suppliers, not your hyperscalers. You own almost none of the borrowers directly. Your exposure comes through the chip companies whose customers are borrowing. Baird's Ted Mortonson said the Street is "tiring of the Bank of Nvidia, the Bank of AMD and the Bank of Broadcom". NVDA, at $215.71, is 13.7% below your $250 target. It also owns about 10% of CoreWeave, so CoreWeave's credit trouble is NVDA's problem too.

- Your theses. MSFT is down 2.6% and GOOG 2.1% today, even though both can fund their own spending. Reuters noted the strain on cash flows even at giants such as Alphabet (GOOGL) and Meta Platforms (META). Your GOOGL thesis that it "has the full AI stack" holds up on strategy. The catch is that owning the full stack also means paying for all of it. AAPL is the opposite case: it's up 0.1% today, acting as a safe haven, and sits 18.1% above your $290 target. Your Oct 6 thesis says "Significant downside risk from here," yet AAPL was your largest Core weight at 7.5% in the upload. If both are still current, the position and the view disagree, and it's worth reconciling.

What I'd do: I wouldn't sell broadly into a nine-day chip losing streak. I'd use the next two weeks to cut factor concentration on purpose rather than in a panic, and to decide what you want to own among the companies that sell into the AI buildout.

What to watch:

- CoreWeave's bond prices and CDS: the earliest warning sign.

- Whether the semis losing streak breaks.

- The 10-year yield moving back above 5.2%.

- Hyperscaler capex guidance in late-October earnings.

- The FOMC decision on October 28.