Oil has climbed back above $100 a barrel, and government bond yields are hovering close to their highest levels in more than two decades. The combination is tightening financial conditions just as investors wait for a fresh reading on US inflation, due on Wednesday.
Tanker attacks keep crude on edge
Brent crude, the international benchmark, settled at $104.72 on Friday and reached $105.48 in Sunday evening trading after fresh incidents at sea. Two more tankers were reported attacked on Sunday, one in the Strait of Hormuz and another off the coast of Oman. Prices have stayed in a band of roughly $103 to $105 since, while US crude has held near $91 a barrel.
The latest jump follows weeks of volatility. Brent first broke above $100 in September, for the first time since May, as the conflict between Iran and the United States escalated. The waterway at the centre of the dispute carried roughly a fifth of the world’s oil and gas supplies before the war.
A weekend announcement of an energy ceasefire between Russia and Ukraine failed to calm the market. Neither side confirmed it, and later reports described a narrower, refinery-only proposal.
Why oil moves the bond market
Energy prices feed directly into inflation expectations, and inflation expectations determine what investors demand for lending to governments. When crude rises, bond prices tend to fall and yields climb. This month has followed that pattern closely.
The 10-year US Treasury yield held at 5.24% at the end of last week. It touched about 5.35% on 7 October, its highest level since 2002. Shorter and longer maturities have also been under strain. In late September, five-year and 30-year yields reached levels not seen since before the 2008 financial crisis.
The pressure is not confined to the United States. UK ten-year borrowing costs have reached their highest since July 2007, and the 30-year gilt yield has topped 6%.
A central bank in tightening mode
The Federal Reserve has already acted. In September it raised rates by a quarter of a percentage point in a unanimous vote, its first increase since 2023. That took the target range to 3.75% to 4.00%. Most policymakers projected at least one more increase this year, and they do not expect inflation to return to the 2% target until 2029.
The reason is straightforward. US inflation stood at 3.4% in August. Minutes from the September meeting showed most officials expect another increase this year, though the timing is uncertain. Governor Waller has said further hikes will probably be needed, while stressing there is flexibility on the pace.
Markets are not betting on immediate action. As of last Friday, traders put the chance of the Fed holding steady in October at about 78%, with a roughly 69% chance of a quarter-point increase in December. The next policy meeting is on 27 and 28 October.
What it means beyond Wall Street
The 10-year Treasury yield matters well beyond trading desks. It is the benchmark that influences mortgages, car loans and other forms of credit. A sustained rise raises borrowing costs for households and companies, which can slow spending and investment even without further action from the central bank.
Higher yields also change the maths for investors. Government bonds now offer returns that compete with riskier assets, which can weigh on share prices, particularly in sectors that depend on future growth. This is one reason stock markets have become more sensitive to every inflation and oil headline.
What to watch this week
The first test is Wednesday’s consumer price index. The report is due on 14 October. A hotter-than-expected number would strengthen the argument for further tightening and could push yields higher. A softer reading might give bond markets some relief.
Investors will also watch the start of third-quarter earnings season. Four of the largest US banks report before the market opens today, and their comments on borrowers, lending and the rate outlook will be closely read.
None of this is set in stone. Oil could fall quickly if shipping through the Gulf stabilises, and inflation could ease faster than forecast. Policymakers themselves describe the path as conditional. Inflation, employment, consumer demand and oil prices can all change it.
