May inflation came in at 4.2% from a year ago, the worst reading in three years. A number that ugly usually pushes bond yields up.
They fell instead.
First, the term. A bond's yield is the interest it pays, and that yield tends to rise when traders fear inflation.
So why did yields fall? Because the 4.2% jump came mostly from energy.
Energy prices rose 3.9% in May, and gas led the way. Over the past year, gas is up about 40% and energy costs are up more than 20%.
Prices rose 0.5% from April, right in line with what traders expected. Strip out food and gas, and the "core" reading rose just 0.2%, less than forecast.
Think of the headline number as today's weather and core as the climate. Bond traders watch the climate, and it looked calm.
We turn confusing data like the inflation report into something you can actually use, every morning in Market Briefs, plus a free investing masterclass when you join.
Oil also fell about 3% that day, after Trump called off a planned strike on Iran. U.S. crude dropped to about $87 a barrel.
Lower oil today means cooler inflation tomorrow. That took the pressure off bonds, trimming yields by 2 to 3 basis points across the board.
A basis point is one-hundredth of a percent. These were small moves, but they all pointed the same way.
Traders had braced for a hotter report. The soft core number came as a relief, and they bought bonds.
Headline inflation bounces around with gas and food. The Fed leans on the core number because it shows the steadier trend.
At 4.2%, the headline rate is the highest since 2023. But core prices rose just 2.9% over the year, a much calmer figure.
That is why a scary headline did not spook the bond market. The trend underneath still looks tame.
When yields drop, borrowing gets a little cheaper. That can ease the rates on mortgages and other loans tied to the bond market.
The 10-year Treasury is the benchmark most loans follow. A small dip there ripples out to everyday borrowers.
Bond prices and yields move in opposite directions. When buyers rush in, prices rise and yields fall, which is just what happened here.
The Fed meets next week and is expected to hold rates steady at 3.50% to 3.75%. It is the first meeting led by new chair Kevin Warsh.
A tame core number gives the Fed cover to wait. The headline rate is loud, but the part it steers by is quiet.
Keep an eye on oil. If prices climb back, the inflation scare comes right back with them.
For now, the bond market made its call. It decided the inflation spike will not last.
Get bonds, rates, and inflation in plain English by signing up for Market Briefs, and grab the 45-minute investing course that comes with it.