Public bond markets
Public bond markets are the primary destination for rated debt. A credit rating is not always a legal requirement for public issuance, but in practice it is a near-prerequisite for meaningful institutional distribution in most markets. This page provides a structural overview of the main public bond markets and the role ratings play within them.
US dollar markets
The US investment-grade bond market is the deepest and most liquid corporate bond market in the world, with annual issuance running well into the hundreds of billions of dollars. Issuers typically obtain two ratings before accessing this market — most investment-grade index investors require at least two ratings for inclusion in benchmarks such as the Bloomberg US Aggregate and the ICE BofA US Corporate Index. High-yield issuers may proceed with one rating, though two ratings improve pricing and distribution breadth.
Access formats include Regulation S (non-US investors), Rule 144A (qualified institutional buyers in the US with registration rights), and SEC-registered shelf offerings (for frequent, highly-rated issuers). Tenors in investment grade typically range from three to thirty years, with the longest tenors reserved for the highest-rated names. High-yield bonds typically run five to ten years and carry call structures that allow refinancing once the no-call period expires.
Euro markets
The Euro investment-grade market is structurally different from the US: a single rating is often acceptable for smaller transactions, though two ratings have become the standard for larger benchmark deals and for issuers targeting broad index inclusion. The primary format is Regulation S (no US registration). Euro high-yield issuers face similar conventions to the US market.
Typical investment-grade tenors in euros run from three to fifteen years for corporate issuers, with ultra-long (20–30 year) tranches available for the most highly-rated utilities, infrastructure, and sovereign-adjacent names. The ECAI framework governs which ratings can be used for regulatory purposes within EU and UK regulated entities — see theECAI page for detail.
Other major markets
- Sterling (GBP) — a well-established investment-grade market, particularly for utilities and infrastructure. Single rating from one of the Big 3 is typically sufficient; ECAI recognition required for UK regulated entities.
- Swiss franc (CHF) — a conservative, high-quality market dominated by investment-grade issuers; Schuldscheindarlehen (private placements) are also common.
- Japanese yen (JPY) — domestic yen issuance typically requires a local Japanese agency rating (JCR or R&I) alongside or in lieu of a Big 3 rating.
- Australian dollar (AUD) — a smaller but active market for investment-grade issuers with Australian operations or investor relationships.
- Emerging market currencies — local-currency bond markets exist across Asia, Latin America, the Middle East, and Africa, each with its own regulatory conventions and typical rating agency requirements. Regional agencies often play a more prominent role than the Big 3 in these markets.
What ratings unlock in public bond markets
| Mechanism | How ratings matter |
|---|---|
| Index eligibility | Most institutional bond indices require a minimum rating (typically investment grade) for inclusion. Index eligibility drives a large share of demand from passive and benchmark-constrained investors. |
| Investor mandates | Many institutional investors — pension funds, insurance companies, money market funds — have explicit mandate constraints that limit or prohibit holdings below a certain rating threshold. |
| Pricing and spread | Ratings function as a spread benchmark for investors unfamiliar with the issuer. A wider and better-informed investor base typically produces more competitive pricing. |
| Primary market syndicate | Bookrunners size and structure transactions partly based on the expected investor universe, which is shaped by the rating. |
| Repo and collateral eligibility | Central bank and interbank repo markets require rated collateral above minimum thresholds; ECAI recognition determines eligibility in Europe. |