US Stocks Climb on Iran Sanctions, Tech Leads Gains; Oil, Yields Fall

**Implied Volatility / Movement:** The Nasdaq Composite advanced 0.5%, and the S&P 500 climbed 0.3%.

US equity markets saw gains, with technology sectors spearheading the advance, while government bond yields and crude oil prices extended their declines. This movement follows the Treasury Department's initiation of a campaign to tighten sanctions on Iran.

The Nasdaq Composite finished up 0.5% at 26,151.30, and the S&P 500 rose 0.3% to 7,677.28. The Dow Jones Industrial Average edged up 0.3% to 53,577.40. The energy sector was among the decliners.

The Treasury Department is reportedly targeting sectors including aviation, shipping, technology, gold, and cryptocurrency to pressure Iran's economy, with threats of further sanctions on countries maintaining economic ties with Tehran. China, a major buyer of Iranian oil, has stated it will take necessary measures to protect its interests.

Oil prices fell significantly, with West Texas Intermediate crude down 5.5% to $80.34 per barrel and Brent crude down 6.5% to $86.18 per barrel. US Treasury yields also declined, with the 10-year yield dropping 8.1 basis points to 4.62% and the 30-year yield falling 7.4 basis points to 5.16%.

Economic data released showed a dip in consumer confidence to 89.4 in August, and new home sales fell 6.3% from a year ago. Investors are also anticipating the release of July's personal consumption expenditures (PCE) data. Dick's Sporting Goods (DKS) lowered its full-year outlook, contributing to sector movements.

### Story Arc / How We Got Here

This follows our earlier coverage ([Gundlach Warns Nvidia's AI Financing Risks](/explore/gundlach-warns-nvidias-ai-financing-risks)) on 2026-08-18. Jeff Gundlach, the founder of DoubleLine Capital, has expressed concerns over the extensive financing being directed towards artificial intelligence infrastructure, particularly highlighting Nvidia Corp. (NASDAQ:NVDA). His comparison of this AI boom's financing to bonds backed by bananas suggests a potential for unsustainable market conditions. · * Jeff Gundlach's cautionary remarks on Nvidia's financing push may lead investors to scrutinize the sustainability of -related debt and equity plays. Watch for increased focus on risk assessment in sector investments.