US stock futures decline as bond yields rise and oil prices increase

US stock futures slid before the opening bell on August 18, with the Nasdaq 100 dropping 1.4% and the S&P 500 falling 0.6%. The culprits: a sharp move higher in Treasury yields and oil prices that reminded investors the macro environment still has teeth.

The 30-year Treasury yield climbed to its highest level since 2007, a benchmark that carries psychological weight for a market that spent years basking in low borrowing costs. Meanwhile, Brent crude traded near $91 per barrel, fueled by fading hopes for any near-term peace in the Middle East.

The yield squeeze tightens

The 10-year Treasury yield pushed toward levels not seen since early 2025, compounding the pressure on growth-oriented names.

Technology and AI-related stocks bore the brunt of the sell-off. These are the segments most sensitive to higher discount rates, because so much of their valuation is built on future earnings projections. When yields rise, those future profits are worth less in today’s dollars.

Energy stocks, by contrast, showed relative resilience. The same oil price surge punishing the broader market is a direct revenue tailwind for producers.

Oil and geopolitics collide

Brent near $91 per barrel isn’t panic territory, but it’s high enough to reignite inflation fears. For the Federal Reserve, this creates a headache. Higher energy prices push headline inflation metrics upward, potentially forcing the central bank to maintain restrictive monetary policy for longer. That translates directly into elevated Treasury yields, which circles back to pressure on equities.

Treasury steps in with a buyback plan

The US Treasury announced plans to double their bond buyback program in September, targeting longer-dated Treasuries in an effort to stabilize that corner of the market. The initial market reaction offered a brief moment of relief. But it proved temporary, as yields resumed their climb shortly after the announcement.

What investors should be watching

The tech and AI trade that dominated portfolios faces a genuine stress test. Valuations in those sectors were built on assumptions of moderating rates and declining inflation. Overall market reactions showed mixed follow-through after the initial declines.

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