Corporate bond issuance in 2026 is running at a record pace while credit spreads stay near historic lows. SIFMA reports $1,899.8 billion of US corporate bond issuance through August, up 29.8% from a year earlier [1]. The ICE BofA investment-grade spread was 0.78 percentage point on September 16, 2026, about where it started the year, and the high-yield spread was 2.70 points [2][3]. What has changed is the level of Treasury yields: the 10-year yield rose from 4.18% at the end of 2025 to 5.01%, so companies are borrowing much more at higher all-in rates [4].
How much corporate debt has been issued in 2026?
SIFMA's statistics, published September 14, 2026, show the scale of the year's supply [1]:
| US corporate bond market | 2026 figure | Change from 2025 |
|---|---|---|
| Issuance, January to August | $1,899.8 billion | +29.8% |
| Average daily trading volume, January to August | $66.9 billion | +15.3% |
| Bonds outstanding, second quarter | $12.1 trillion | +4.2% |
The global picture is similar. LSEG data reported by Yahoo Finance show $3.4 trillion of investment-grade corporate debt issued worldwide in the first half of 2026, up 10% and the highest first-half total on record [5]. Much of the new supply funds three needs: large acquisitions, many of them record-sized, the build-out of AI data centers and power, and refinancing of debt issued when rates were lower.
The link between deals and debt is direct. When a buyer pays cash for a large target, it often funds the purchase with new bonds soon after the deal is signed, so a record year for M&A tends to become a record year for bond supply a few months later. Readers can follow the pipeline of pending cash deals in DataPorium's M&A screener, which gives an early view of issuance that may still come to market.
What are corporate credit spreads in 2026?
A credit spread is the extra yield a corporate bond pays over a Treasury bond of similar maturity. It measures the compensation investors demand for default and liquidity risk. The ICE BofA option-adjusted spreads published by the Federal Reserve Bank of St. Louis show a sharp but brief widening in March, then a return to tight levels [2][3]:
| Date | Investment grade | High yield |
|---|---|---|
| Dec 31, 2025 | 0.79 | 2.81 |
| 2026 widest | 0.94 (Mar 16) | 3.46 (Mar 30) |
| Jun 30, 2026 | 0.76 | 2.75 |
| 2026 tightest | 0.73 (Jan and late May) | 2.60 (Aug 28) |
| Sep 16, 2026 | 0.78 | 2.70 |
Values are in percentage points. The March widening lasted only a few weeks. By late August the high-yield spread reached its tightest level of the year.
Why spreads stay tight while supply surges
Heavy issuance would normally push spreads wider, because investors need a better price to absorb more bonds. Three factors have offset that pressure:
- High all-in yields. With the 10-year Treasury at 5.01% and an investment-grade spread of 0.78 point, a simple estimate puts a typical high-grade yield near 5.8%, attractive for insurers, pension funds and individual investors who buy on yield [2][4].
- Strong issuers. Much of the supply comes from large, highly rated companies funding investment, not from weak borrowers.
- Growing demand for trading. Average daily volume is up 15.3%, a sign of a deep and liquid market that can absorb new deals [1].
What higher yields mean for companies and investors
For borrowers, the cost of debt has risen even though spreads have not. The effective federal funds rate was 3.63% in August 2026, according to DataPorium's economic data, well below the 10-year Treasury yield [6][4]. That steep gap means long-term borrowing costs are driven more by bond investors' views on inflation and government debt supply than by the Federal Reserve's policy rate. A company that issued 10-year debt at 4.9% at the end of 2025 (4.18% plus 0.79 point) would pay about 5.8% today.
From a fiscally conservative perspective, the rise in long-term Treasury yields is a reminder that heavy government borrowing competes with private borrowers for the same savings. Every point of higher Treasury yields raises the cost of corporate investment too. The counterpoint is that companies are still choosing to borrow at these rates, which signals confidence in the returns on their projects.
What tight spreads mean for bond investors
Tight spreads leave little room for error. At 0.78 point, investment-grade investors are paid only a small premium over Treasuries for credit risk, and at 2.70 points high-yield investors are near the lowest compensation of the year [2][3]. If the economy slows, spreads could widen quickly, as they briefly did in March. Investors may consider comparing the yield on corporate bonds with Treasuries of the same maturity, and focusing on issuer quality rather than yield alone.
Corporate bond issuance in 2026 is up almost 30% at tight spreads, so rising Treasury yields, not credit risk, are driving higher borrowing costs.
Key takeaways
- US corporate bond issuance reached $1,899.8 billion through August 2026, up 29.8% from a year earlier.
- The investment-grade spread was 0.78 point and the high-yield spread 2.70 points on September 16, 2026, close to where they began the year.
- Spreads widened briefly in March, to 0.94 and 3.46 points, then tightened again.
- The 10-year Treasury yield rose from 4.18% to 5.01%, lifting all-in corporate borrowing costs to about 5.8% for high-grade issuers.
Frequently asked questions
How much corporate bond issuance has there been in 2026?
SIFMA reports $1,899.8 billion of US corporate bond issuance from January through August 2026, up 29.8% from the same period of 2025. Globally, investment-grade issuance reached a record $3.4 trillion in the first half, according to LSEG.
What is the current investment-grade credit spread?
The ICE BofA US Corporate Index option-adjusted spread was 0.78 percentage point on September 16, 2026. It ranged from 0.73 to 0.94 point during 2026.
How tight are high-yield bond spreads in 2026?
The ICE BofA US High Yield spread was 2.70 points on September 16, 2026, close to its 2026 low of 2.60 points on August 28 and below the 2.81 points at the end of 2025.
Why are corporate borrowing costs rising if spreads are tight?
Because Treasury yields have risen. The 10-year Treasury yield climbed from 4.18% at the end of 2025 to 5.01% on September 16, 2026, and corporate yields are built on top of Treasury yields.
Sources & References
- [1] SIFMA: US Corporate Bonds Statistics, September 14, 2026
- [2] FRED: ICE BofA US Corporate Index Option-Adjusted Spread (BAMLC0A0CM)
- [3] FRED: ICE BofA US High Yield Index Option-Adjusted Spread (BAMLH0A0HYM2)
- [4] FRED: Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity (DGS10)
- [5] Yahoo Finance: Mega-deals propel global M&A to record first half (LSEG data), July 3, 2026
- [6] DataPorium Economic Metrics: effective federal funds rate
