A credit spread is the premium investors demand to hold a corporate bond instead of a government bond of the same maturity, compensating for default risk. Spreads narrow when investors are confident and widen when they fear rising defaults — and because credit markets often move before equities, widening spreads have historically preceded equity market stress by several weeks.
Why it matters
- —Credit markets tend to lead equity markets — a widening spread is often an early warning sign before stock prices reflect the same stress.
- —Comparing high-yield spreads (HYG) against investment-grade spreads (LQD) shows exactly where credit stress is concentrated — usually in lower-quality borrowers first.
- —Tight spreads alongside a strong economy is the calmest macro backdrop for risk assets; tight spreads alongside a weakening economy can signal complacency.
How to read it
| Narrowing spreads | Risk-on — rising confidence in corporate credit quality |
| Stable, moderate spreads | Normal credit conditions |
| Widening spreads | Risk-off — rising fear of defaults, often precedes equity stress |