Higher real yields and a Fed that is still hiking are the binding constraint. Equities are being carried by earnings growth rather than valuation, credit stress is building in the weakest borrowers, and the AI build-out is increasingly financed with outside capital. No forced-selling trigger is visible yet; the denser risk calendar falls in December to February.
Market data to the 9 October 2026 close; Fed funds futures as of 10 October 2026
Stocks and bonds have fallen together since early September: daily S&P 500 returns have correlated −0.52 with daily moves in the 30-year yield (our calculation from daily closes).5
The S&P 500 trades at 19.1x forward earnings, its 10-year average, and its forward earnings yield is roughly equal to the 10-year Treasury yield.6
The S&P 500 and QQQ set records on 6 October with only about 30% of S&P 500 members above their 50-day average. Since 4 September, QQQ is up 4.5% while the equal-weight S&P 500 is down 2.7% and small caps are down 5.8% (our calculation from daily closes).
Capital spending at Microsoft, Alphabet, Amazon and Meta was 96% of their operating cash flow in Q2 2026, against 69% a year earlier, and Alphabet and Meta bought back no stock in the first half. The widely quoted $1.2T of 2027 spend is Goldman Sachs' forecast of AI-related capex at five hyperscalers, not company guidance.14,15,16
Q2 cloud revenue grew 82% at Google Cloud, 43% at Azure (constant currency) and 37% at AWS.17
This section concerns Anthropic, the developer of the AI model used to help compile these observations. See the note at the foot of the page.
On Vercel's AI gateway, open-weight models were 56% of tokens in August but 14% of spend; Anthropic has held at least 61% of spend every month since December 2025. The pressure on dollars comes from OpenAI's pricing and from customers trading down to cheaper tiers. Open-weight models trail the frontier by about four months.30,31,32
Recognised Q3 revenue of about $16B (July's pace × 3) or less would mean growth has stalled; $18.5B or more would mean it is intact. The listing is reported for mid to late November. A fast entry to the Nasdaq-100 would likely put roughly 1% of QQQ into the stock (SpaceX entered at about 1.2%).35,36
Dates as published or reported at the time of writing; estimated dates are marked.
These observations are general market commentary, published for information only. They are not investment advice, a recommendation, or an offer or solicitation to buy or sell any security, and they do not take into account any reader's objectives or circumstances. Mentions of companies are not recommendations. Figures are as dated and sourced; our own calculations and estimates are labelled as such. Views may change without notice.
Compiled with AI assistance (Claude, developed by Anthropic) from public sources. Anthropic is one of the companies discussed.