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A parallel shift is a movement of the yield curve where interest rates across all maturities rise or fall by the same number of basis points. This means short-term, medium-term, and long-term bond yields move together without changing the overall shape or slope of the yield curve. Parallel shifts are used to assess how broad interest rate changes may affect bond prices and portfolio duration risk.
A perpetual bond is a bond with no maturity date. It usually pays interest for an indefinite period, while the issuer is not required to repay the principal on a fixed date. Perpetual bonds are often subordinated or hybrid instruments and may include call features, allowing the issuer to redeem them under specified conditions.
A PIK bond is a bond that pays interest in the form of additional debt rather than cash. This allows the issuer to defer cash interest payments, but it increases the outstanding principal amount and can make repayment more burdensome at maturity. PIK bonds are typically used in leveraged finance, mezzanine debt, and situations where the issuer wants to preserve cash flow.
A premium bond is a bond that trades above its face value, usually because its coupon is higher than current market rates. In the UK, “Premium Bonds” also refers to an NS&I savings product where returns come from a prize draw instead of guaranteed interest.
Probability of default is the estimated likelihood that a borrower or bond issuer will fail to meet its debt obligations within a defined time period, usually one year. It is used to assess credit risk, estimate expected loss, compare issuers, and determine whether a bond’s yield provides sufficient compensation for default risk.
Pull to par is the tendency of a bond’s market price to move closer to its par value as it approaches maturity. A bond bought below par usually rises toward par, while a bond bought above par usually declines toward par, assuming yields and credit conditions remain unchanged.
A puttable bond is a bond with an embedded put option that gives the holder the right — but not the obligation — to sell the bond back to the issuer at a preset price, usually par, on set dates before maturity.
A rating agency is a company that assesses how likely a borrower — a government, bank or company — is to repay its debt, and publishes that opinion as a letter grade such as AAA or BB.
A rating scale is the graded system of letter symbols — from AAA at the top down to D — that credit rating agencies use to rank how likely a bond issuer or bond is to default, from the safest investment grade to the riskiest high yield.
Rating trigger is a clause in a bond’s terms that automatically changes the deal — the coupon, the collateral, or the repayment date — when the issuer’s credit rating crosses a set threshold, almost always a downgrade.