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Investment Grade: Definition & Meaning | Bondfish

What investment grade means

Every bond carries a credit rating that estimates how likely the issuer is to pay interest and repay principal on time. Ratings from S&P Global, Fitch and Moody’s split the whole market into two zones. The top four rating categories are investment grade; everything below is speculative grade, also called high yield or “junk.”

The dividing line sits at a single notch. A bond is investment grade if it is rated BBB− or above at S&P and Fitch, or Baa3 or above at Moody’s. Drop one notch to BB+ (Ba1 at Moody’s) and the same bond becomes high yield. The plus/minus signs at S&P and Fitch — and the 1-2-3 modifiers at Moody’s — simply mark the top, middle or bottom third of each band.

Why it matters for bond investors

The investment-grade label is shorthand for credit quality, and it drives real money. Pension funds, insurers and many bond ETFs are restricted by mandate to hold only investment-grade paper, so the BBB−/Baa3 cutoff is one of the most consequential lines in global finance. History backs up the label: investment-grade issuers default rarely — the cumulative five-year default rate on BBB-rated corporates has run around 1.5%, versus more than 20% for lower, B-rated bonds.

The trade-off is yield. Because investment-grade bonds are safer, they pay less than high-yield bonds; you accept a lower coupon in exchange for a far lower chance of losing your principal. For most retail investors, investment grade forms the ballast of a bond allocation, with any high-yield exposure kept deliberate and small. You can filter for a specific rating floor — say, A− and above in EUR or USD — using the Bondfish bond screener, or see current names in our Top Picks.

The investment-grade cutoff by agency

The three agencies use different notation but draw the line in the same place. Everything in the table below is investment grade; the first rating beneath each column is already high yield.

TierS&P / FitchMoody’sMeaning
Highest quality AAA Aaa Minimal credit risk
High quality AA+ to AA− Aa1 to Aa3 Very low credit risk
Upper-medium A+ to A− A1 to A3 Low credit risk
Lowest investment grade BBB+ to BBB− Baa1 to Baa3 Moderate risk — still investment grade
First high-yield notch BB+ and below Ba1 and below Speculative — no longer investment grade

A useful practical rule: an issuer that slips from BBB− to BB+ is said to become a “fallen angel,” and the forced selling by mandate-restricted funds can move its price sharply — a reminder that the investment-grade boundary is a threshold worth watching, not just a label.

Related reading

Sources

This definition is for general information only and is not investment advice. Credit ratings are opinions, not guarantees, and can change. Bond investing involves risk, including possible loss of principal.