According
to the Financial Times,
“A sharp sell-off in US government bonds is starting to reverberate across corporate America, forcing companies to overhaul their borrowing plans and even raising the spectre of defaults among the most lowly rate businesses.
Borrowing costs for companies with the lowest credit ratings hit their highest levels since May 202 this month at 17 per cent, driven by the rise in Treasury yields to multiyear highs and by investors demanding more compensation for lending to such businesses. The risk premium for groups rated triple C or lower has risen to 12 percentage points, the biggest since 2022.”
This prompted me to examine the data myself and assess whether the evidence supports the Financial Times' conclusions.
My Analysis:
When companies borrow money in the bond market, the interest rate (or “effective yield”) they must pay depends on their financial strength. I analyzed three distinct corporate tiers:
- US Corporate (Investment Grade): Consisting of solid, blue-chip corporations with strong balance sheets.
- BB High Yield: Consisting of mid-tier companies with higher debt but stable businesses.
- CCC & Lower High Yield: Consisting of higher-risk or financially strained companies with the highest borrowing costs. These were the ones that were of special focus in the Financial Times reporting.
To easily compare how fast borrowing rates have grown across these different tiers in 2026, I indexed all yields to a baseline score of 100 on January 1, 2026. The way to read this index is to think of 100 as the starting point. If the index rises to 120, it means that tier’s interest rate increased by 20% from where it started in the year. This helps us see which companies saw their borrowing costs rise fastest in percentage terms and whether all rates moved up and down at the same time.
Take a look at the graph, courtesy of the data obtained from the St. Louis FED FRED database:
What the Numbers Show:
Early 2026 (January – May): During the first five months of the year, all three credit tiers move together in a tight band between 100 and 112.
- CCC & Lower reached ~136 by October (a +36% proportional increase in its yield rate).
- BB High Yield rose to ~128 (+28% increase).
- US Corporate (Investment Grade) rose to ~124 (+24% increase).
How 2026 Differs from 2025:
In 2025 we saw High-risk companies enjoy a relatively lower rate pressure for much of the year (which you can see that their index spent long stretches down around 88), while mid-tier BB bonds saw the biggest spike in the spring of 2025.
In 2026 that dynamic completely flipped. In the second half of 2026, consistent with what the Financial Times reported, the most vulnerable companies faced the steepest rate hikes, seeing their borrowing cost surge much faster than those of safer corporations. Why? As Treasury yields have increased, so has the baseline cost of capital for all borrowers. Lower-rated companies often experience an additional widening of credit spreads as investors demand greater compensation for default risk. As a result, CCC borrowing costs can rise much faster than those of investment-grade issuers.
Conclusion:
Refinancing Squeeze on Vulnerable Businesses: A +36% jump in borrowing rate levels means heavily indebted, lower-tier corporates face a severe increase in annual interest expenses when rolling over or issuing new debt. The open question becomes how many of these firms will be able to obtain financing.
Growing Caution in the Market: When investors demand much higher proportional yields from CCC-rated issuers compared to solid blue-chip companies, it signals heightened market concern about credit stress, debt serviceability, and default risks among financially vulnerable firms.
Should the upward trend in yields persist, I would expect default risk to rise across the corporate sector, particularly among lower-rated issuers that depend heavily on refinancing. At the same time, Investment Grade corporations may become increasingly selective in their debt issuance, acquisition strategies, and capital allocation decisions as financing costs rise. In that environment, higher borrowing costs would act as a drag on both corporate activity and broader economic growth.












