Investment-grade rating.
In plain English
An investment-grade rating is a credit agency's judgment that a bond issuer is among the more likely to pay on time. Agencies use letter scales, with the investment-grade band sitting above the speculative or high-yield band and a hard line between them. The rating is an opinion about default risk, not a guarantee, and it says nothing about price. Many pension and insurance mandates restrict holdings to investment grade, so a downgrade across that line can force selling. That forced selling is why the boundary matters far more than a one-notch move inside the band.
01Why it matters
Where a bond sits relative to the investment-grade line drives who is allowed to own it, which drives its price and how easy it is to sell in a bad week.
02The math, step by step
Say a bond rated at the bottom notch of investment grade is downgraded one notch into high yield. Funds with an investment-grade-only mandate must sell. A bond that traded at 98 cents on the dollar can change hands near 90 within days, an 8 percent drop with no change in the business itself.
Illustrative example. The amounts here are hypothetical, chosen to show how the math works, not real quoted rates or figures.
03What this is NOT
It is not a promise. A rating is an opinion about relative odds, and investment-grade issuers do default. It also says nothing about interest rate risk, which can lose you money on a bond that pays every coupon on schedule.
04Receipts
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Plain-English answers from our glossary. Receipts included. Never advice.
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