What moved
US cash closed lower on Monday: the S&P 500 ended down 0.48% at 7,619.98, the Nasdaq Composite down 0.56% at 26,186.41 and the Dow down 0.29%. Futures are the only live read this morning and they point the other way — S&P 500 contracts are up 0.65% and Nasdaq 100 contracts up 0.81%.
Asia is mixed as it winds down. The Nikkei 225 is up 0.23% at 63,635.93, helped by SoftBank recovering its overnight losses, while the Hang Seng is down 0.75%, the Shanghai Composite down 0.37% and the Kospi down 1.09%. Europe finished Monday soft — the DAX lost 0.50%, the CAC 40 0.76% and the Euro Stoxx 50 1.02% — with the FTSE 100 the exception, up 0.44% at 10,697.57 on its defensive weighting.
Why
One story dominated. Over the weekend the chief executives of Anthropic, OpenAI and Tesla publicly called for a slowdown in frontier AI development, and the market read it as a direct threat to the capital-expenditure cycle that has carried semiconductors and AI infrastructure all year. Nvidia and Broadcom led a 5.9% fall in the Philadelphia semiconductor gauge, and the damage ran down the supply chain: Corning fell 13.7%, Teradyne 13.3% and Coherent 12.7% in the US, with ASM International off 8.6% and Nokia 10.1% in Europe.
The same headline was read as a positive for the other side of software. If AI capability is to be governed rather than raced, spending shifts toward controls and monitoring — Zscaler rose 16.5%, Tenable 16.5%, CrowdStrike 13.9% and Palo Alto Networks 13.1%. That is a rotation within technology, not an exit from it, which is why the index-level damage was modest against the violence underneath.
The second driver is harder for equities to rotate around. Brent is trading up 1.48% at $107.24 and WTI up 1.58% at $102.99, extending a run that has added 18% to Brent over the past month on Middle East supply disruption. That lands two days before a Fed decision with the 10-year Treasury yield at 4.961% — down 1.4 basis points on the day but elevated. Higher energy costs feeding an inflation print the Fed has not finished with is the reason a chip rotation has not simply resolved itself into a relief rally.
Sentiment & risk appetite
Hedging is being bought rather than risk being dumped. The VIX ended Monday up 7.95% at 17.10 and the MOVE index of rates volatility rose 2.06% to 83.90 — up 10.2% over five sessions, the bigger tell heading into Wednesday. Sector dispersion did the real work: US communication services gained 2.19% and health care 1.45% while technology fell 1.81% and industrials 1.42%. Breadth was mildly negative rather than broken, with 2,658 advancers against 3,137 decliners across PrimerIQ's US universe. The safe-haven bid was notably absent — gold is down 0.52% at $4,329.10 and the dollar index is 0.19% firmer at 99.652, with sterling at 1.3473 and the euro at 1.1533. A firmer dollar tightens conditions for emerging markets that borrow in it, which is visible in Asia's softer tape.
Economic calendar
UK labour market data landed at 07:00 BST. Unemployment held at 4.9% in the three months to May–July, against a consensus of 5.0%, and regular pay growth excluding bonuses ran at 3.5% year-on-year, with total pay slowing to 3.9% from 4.2%. The softer detail sat underneath: the claimant count rose 27.8k in August against expectations of an 8.3k increase, payrolled employees were down 145,000 on the year in August, and vacancies fell to 702,000. A labour market cooling without cracking gives the Bank of England little reason to move quickly in either direction.
There is nothing of comparable weight from the US today; the week's tests are Wednesday's August retail sales at 08:30 ET (13:30 BST) and the FOMC decision at 14:00 ET (19:00 BST), where the market is leaning toward a quarter-point increase from the current 3.5–3.75% range. The dot plot alongside it matters more than the move.
Earnings
Nothing of consequence has reported into the London open, and the overnight Asia-Pacific slate was thin. Monday's outsized single-stock moves were repricing on the AI-governance headline rather than results — none of the double-digit gainers or losers reported numbers. Trip.com is the notable name due after the US close tonight.