18/10/2026
US equities fell, but the decline was anything but broad. The S&P 500 lost 2.0%, its worst week since June, and the Nasdaq Composite slid 4.5%. Beneath the surface, the market moved the other way: the equal-weighted S&P 500 gained 0.5%, the Dow rose 0.7% and large-cap value climbed 1.0% as large-cap growth sank 4.3%.
The selloff swept through the entire AI supply chain. The Philadelphia Semiconductor Index fell for eight straight sessions, its longest losing streak since 2008, erasing about $1 trillion in market value. Equipment, memory, networking, server and AI power names all posted double-digit declines, but the companies funding the buildout fared far better: Microsoft and Meta slipped little more than 1%, and Apple rose.
Investors targeted the suppliers of AI infrastructure rather than its buyers, questioning whether the spending will earn an adequate return and how long it can last. Doubts had been building since the FT reported last week that OpenAI’s annualized revenue was $20 billion below what it had signaled and that the company had pushed its IPO into next year.
Worries about financing the buildout surfaced most clearly at CoreWeave. The AI cloud provider’s bonds due 2032, issued at par just four months ago, sank to about 78 cents on the dollar, and its credit-default swaps priced in more than a 60% chance of default within five years. The stock lost 25%.
Much of the selling appears to have come from hedge funds. According to Goldman Sachs’ prime brokerage, they net sold global AI stocks for five consecutive sessions. Long sales outpaced short sales by 3.5 to 1, a sign of liquidation rather than fresh bearish bets. Retail investors took the opposite side: the triple-leveraged semiconductor ETF SOXL drew a record $3.9 billion from Monday to Thursday.
The global ex-US index fell 1.7%, with losses concentrated in the markets most exposed to AI. Emerging markets slid 5.7%, led by South Korea (-15.1%) and Taiwan (-7.0%), and Japan lost 3.1%. Europe was the bright spot, rising 1.4% in dollar terms, as investors rotated out of the AI trade into defensive sectors.
The J.P. Morgan Global Composite PMI rose to 54.3 in September from 53.5, its sixth straight gain, matching the highest level since late 2021. Services hit a 40-month high of 54.5 as travel and tourism recovered. Higher energy and transport costs pushed services cost inflation to its highest since January 2023, and S&P Global expects global consumer inflation, 3.7% in August, to top 4% soon.
Crypto assets slipped for a third straight week: Bitcoin fell 0.9% and total market capitalization 1.5%. On Thursday, Bitcoin briefly dropped below $80,000, caught in the broader retreat from risk assets. Spot Bitcoin ETFs saw net outflows for a second consecutive week, losing $228 million.
CME FedWatch put the probability of an October hike at 15.5%, down from 17.7% a week earlier, and markets still price three hikes in December, March and June. Futures imply around 19 bp of cumulative tightening by year-end 2026, up from 18 bp, and 72 bp by year-end 2027, down from 80 bp. The small change in the October odds masked a sharp swing: Wednesday’s hotter-than-expected CPI report briefly lifted them to 55%, before Fed Chair Kevin Warsh said on Friday that the economy had “broadly conformed” to the Fed’s expectations. John Williams’ view that, for now, no hike is needed in 2027 pulled next year’s pricing lower.
The Treasury yield curve flattened as long-term yields fell sharply. According to Bloomberg, the 1-year yield nudged lower by 3 bp to 4.41%, while the 10-year yield declined 17 bp to 5.07% and the 30-year yield fell 18 bp to 5.42%. The biggest move came on Thursday, when a deepening selloff in AI-related shares sent investors into government bonds worldwide, and strong PPI and retail-sales data did little to slow the rally.
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https://atranicapital.substack.com/p/week-42-market-update-for-october-e67