Non-investment grade bonds

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Bonds rated BB+ or lower (S&P, Fitch)

Bonds rated Ba1 or lower (Moody’s)

Non-investment grade bonds can be viewed as a hybrid between investment grade bonds and equity.  While their price and spread movements are influenced by interest rate changes, it is to a lesser extent than investment grade bonds.  

On the other hand, they show greater correlation with movements in equity markets, which are highly influenced by economic growth.  

Historical returns on high-yield bonds and the standard deviation of those returns fall somewhere between investment-grade bonds and equities.

See also: Credit ratings

Synonyms:
Junk bonds, High yield bonds