Oil Breaks $100, Pushing U.S. Treasury Yields to Multi-Year Highs on Mideast Tensions

A sharp escalation in the U.S.-Iran conflict has pushed Brent crude oil prices above $100 a barrel for the first time since July, triggering a surge in global government bond yields as investors brace for persistent inflation. The market's focus now turns to a key U.S. inflation report due Friday and the Federal Reserve's policy decision next week.

Geopolitical Tensions Fuel Oil Rally

Hopes for a de-escalation between Washington and Tehran that grew over the summer have faded amid a series of hostile actions, according to a Reuters report. The U.S. reported destroying five Iranian oil tankers on Tuesday, which was followed by Iran's Revolutionary Guards firing ballistic missiles at a base in Jordan.

Further stoking supply fears, Iran-aligned Houthi forces seized Yemen's port city of Mocha on Thursday, threatening the critical Bab el-Mandeb Strait shipping lane. Against this backdrop, Brent crude futures settled up 6% on Thursday at nearly $108 a barrel before trimming some gains.

Bond Markets React to Inflation Fears

The spike in energy prices has intensified concerns about inflation, driving up government borrowing costs. The bond market sell-off sent key U.S. Treasury yields to new highs:

Ad

• The benchmark 10-year Treasury yield rose above 4.9% on Thursday, its highest level since 2023.
• The 30-year Treasury yield reached a nearly two-decade high of over 5.38%.
• The 2-year Treasury yield jumped to almost 4.6%, a 14-month peak.

Investor sentiment was also dampened by disappointment over the limited size of a U.S. Treasury plan to buy back longer-dated bonds, details of which were announced Wednesday.

Central Banks on High Alert

The surge in yields comes at a critical time for monetary policy. The U.S. August Consumer Price Index (CPI) report, due Friday, is expected to heavily influence the Federal Reserve's decision next week. According to Reuters, fed funds futures traders are pricing in a more than 65% chance of a quarter-point interest rate increase.

The European Central Bank already acted on Thursday, raising its key policy rate by a quarter-point to 2.50% to combat the energy-driven inflation surge. The combination of geopolitical risk, rising energy costs, and tightening monetary policy suggests a volatile autumn for global markets.