US stocks closed mixed on September 19, with a rebound in semiconductor shares driving the Philadelphia Semiconductor Index up more than 2%, while oil prices retreated back below the $100 mark.
In the day's top 20 traded US stocks, memory chip makers saw explosive gains, with Micron rising roughly 4% and SanDisk soaring 11%, following Micron executives' remarks that memory shortages would be difficult to ease in the near term. Most popular Chinese ADRs traded higher, with Alibaba climbing over 4% and TSMC adding more than 1%.
In commodities, oil prices notched a third consecutive decline amid mixed signals on Saudi export prospects, while copper prices firmed and gold extended its upward run. European markets widened losses, with Volkswagen's lowered outlook weighing on the automotive sector.
Where to begin
On the macro front, Trump reiterated that the war with Iran would soon conclude, and signed legislation imposing sanctions on Russia and Iran. He also asserted that the US would secure "permanent control" over Greenland's security, signed a bill to impose tariffs on buyers of Russian oil, and indicated that Washington is in talks with the Houthi rebels. Additionally, Trump said CNN, MSNBC, and Politico would be banned from the White House.
US officials disclosed that military fatalities in the Iran conflict exceed publicly reported numbers from the Defense Department. US-Mexico trade negotiations achieved phased progress, with Sheinbaum noting that partial consensus was reached. The International Atomic Energy Agency reported that a cooling tower at a Russian nuclear plant was struck by a drone, while the Bank of Japan reportedly conducted a currency rate check. Japan's economy faces a "double squeeze" dilemma, with expectations that the central bank's rate hikes will have limited impact. Putin emphasized that Russia's "triad" nuclear forces remain the cornerstone of national sovereignty. Cuba experienced a nationwide blackout, and the European Union's first full-scale CO2 storage project began operations with an initial annual capacity of 400,000 tonnes. The IAEA also added 11 new member states to its board of governors.
Key corporate headlines
In corporate news, Google's AI system broke through its own guardrails for the first time, with Gemini successfully breaching three companies during testing. SpaceX secured an additional $950 million contract from NASA, covering three more Crew Dragon missions. A fresh review determined that the Federal Reserve failed to adequately address recurring issues at Silicon Valley Bank. Anthropic is moving forward with IPO preparations, with projected annualized revenue surpassing $100 billion, and reportedly plans to have around 5 gigawatts of usable computing capacity by year-end, set to double again next year. The Fed's external review of the Silicon Valley Bank collapse found that regulators had identified risks early but delayed action. Toyota estimates that factory automation investments could reach 1 trillion yen annually, covering the company and its key suppliers. Volkswagen lowered its operating margin outlook, and Warren Buffett stepped down as chairman of Berkshire Hathaway, with his second son Howard assuming the role immediately.
Market commentary and analysis
Hedge funds have turned bullish on the yen for the first time since mid-2025. US Treasuries followed European debt lower, with the yield curve flattening. No one likes being micromanaged, yet the Bank of Japan governor faces pressure from two "commanders" simultaneously. Trader sentiment toward the yen has strengthened slightly following the BOJ's reported currency rate check. Kansas City Fed President supported another rate hike, citing that even core inflation excluding energy is "too hot." Bank of America predicts the Fed will raise rates above 5% and advises clients to position for a rise in 2-year yields. Newsom issued an executive order pushing California to implement AI safety measures, including "emergency shutdown" capabilities. Bitcoin rose above $80,000 as investors digested the setback to US crypto legislation and Fed rate hike expectations. Goldman Sachs analyst Snyder dismissed concerns about a US earnings bubble as unfounded, while Lagarde downplayed consecutive rate hike expectations, stating the European Central Bank would decide policy meeting by meeting.