Sep 14 – Sep 20

The week’s dominant market shock came from attacks on Gulf energy infrastructure. Saudi Arabia shut its East-West pipeline after repeated drone strikes, removing an important alternative to the Strait of Hormuz just as Houthi attacks helped postpone Oman-hosted talks on reopening the waterway. With roughly 20% of global oil exports previously moving through Hormuz, Brent briefly reached $108.49 and WTI $106.60 before settling lower. Reuters reported that Saudi Arabia was using oil “shuttles” to keep exports moving, but at higher cost; Brent nevertheless remained above $100 and fuel shortages appeared at some U.S. retailers.

The inflation channel was immediate. The oil spike pushed the U.S. 10-year yield toward 5%, strengthened the dollar and pressured equities, while investors increased the implied probability of a Federal Reserve hike. By September 21, however, WTI had fallen roughly 4.5% to $95.78 and Brent 3.4% to $100.34. That reversal pulled the 10-year yield back to 4.951% and helped the S&P 500 and Nasdaq rally sharply, with technology stocks especially sensitive to discount rates.

The reprieve is not resolution. Saudi export logistics remain more expensive, the conflict still threatens supply, and President Trump’s appeal for Ukraine to stop attacking Russian refineries shows how quickly separate wars are being folded into the fuel-supply calculus. Markets enter the week treating oil as a geopolitical variable rather than a settled inflation input.

The AI trade opened with a sharp warning and ended with a record-setting rally. Anthropic CEO Dario Amodei and OpenAI CEO Sam Altman urged a slower pace for frontier-model development and stronger third-party evaluation, prompting declines of roughly 3% to 3.5% in Nvidia, 7.5% in Marvell, and nearly 6% in the Philadelphia Semiconductor Index. President Trump attacked the idea of slowing AI and data-center construction, framing it as a strategic advantage for China.

Capital spending nonetheless accelerated. AWS and Nvidia announced plans to deliver an additional 2 million GPUs, while Kioxia and Sandisk committed more than $31 billion to Japanese manufacturing. Positron AI raised $875 million at a $5 billion valuation for inference silicon, and Google Cloud said payback periods were under two years overall and under one year for systems using its in-house TPUs. AMD’s roughly 10% gain on September 21 briefly lifted its market capitalization above $1 trillion and helped drive the Nasdaq to a record close.

The constraint is moving from chip supply to social license and physical infrastructure. Texas halted new data-center permits pending an ERCOT grid-connection audit, while California enacted seven bills addressing electricity, water, and local oversight. Meta’s planned C$13 billion Alberta facility illustrates the competition for capacity, but also the political cost of securing it. The next leg of the AI trade will depend increasingly on power availability, regulatory permission, and credible returns—not just accelerator demand.

The U.S. inflation picture hardened at precisely the wrong moment for rate relief. August CPI rose 0.4% month over month and 3.4% year over year, while core CPI increased 0.3% monthly and 2.4% annually, above expectations. Housing and non-housing core services posted their largest monthly gains since April, and producer-price inflation strengthened to 5.4% headline and 4.7% core year over year. The labor market offered no offset: payrolls rose by 162,000, well above consensus, unemployment held at 4.1%, and prior months were revised higher.

That combination reinforced restrictive policy across developed markets. The ECB raised its main rate 25 basis points to 2.5% and lifted its inflation forecast, while the Bank of England held at 3.75% in a 6–3 vote but signaled that a conditional “insurance” hike to 4% remained possible in November. The Bank of Japan raised its benchmark to 1.25%, its highest level since 1995, with Governor Kazuo Ueda leaving further increases on the table.

Bond markets translated the message into unusually high long-term yields. The U.S. 10-year approached 5% early in the week, and the 30-year remained above 5.2% even after the oil reversal. Growth was slowing but not collapsing: private domestic demand remained firm and the Chicago Fed’s activity measures stayed above recession-risk territory. The setup for the coming week is therefore not recession pricing, but a prolonged contest between resilient demand and inflation that refuses to normalize.

Preparations for the September 24 Trump-Xi meeting became the week’s central diplomatic thread. Treasury Secretary Scott Bessent and Chinese Vice Premier He Lifeng met in advance to shape an agenda spanning trade, artificial intelligence, supply chains, cross-border investment, Taiwan, and the wars in the Middle East and Ukraine. The existing U.S.-China trade truce is scheduled to expire on November 10, giving the encounter a defined deadline even if neither side is expected to deliver a comprehensive deal.

The geopolitical backdrop makes economic coordination harder. Xi urged expanded BRICS members and partners to keep industrial and supply chains stable and unimpeded, a message sharpened by shipping disruption around Hormuz. The United States, Japan, and South Korea separately reiterated support for key Asian allies and Taiwan. Reuters characterized the summit’s practical priority as avoiding major new surprises, rather than expecting a sweeping agreement.

Europe supplied a second layer of uncertainty. EU ambassadors delayed renewal of sanctions listings covering nearly 3,000 individuals and companies, and diplomats discussed a possible arrangement that could remove sanctions from Alisher Usmanov and Mikhail Fridman while retaining broader restrictions. In Ukraine, Washington floated an energy-target ceasefire, but President Zelenskyy said Kyiv needed evidence that Moscow would stop attacking critical infrastructure; fighting continued regardless. The summit therefore arrives with trade, technology controls, energy security, and war policy tightly linked.