Convertible securities are bonds or preferred stock that the holder can exchange for a set number of the issuer’s common shares. Each convertible is a package — a fixed-income instrument plus an embedded equity option — behaving like debt when the stock is low and like equity when it’s high.
How convertibles work
The vocabulary: the conversion ratio (shares per bond) implies a conversion price; the conversion premium is how far the stock sits below that price at issuance (typically 20–40%). The payoff shape is the appeal — downside anchored by the bond floor (the instrument’s value as straight debt, coupons and principal intact if never converted), upside participating once the stock climbs through the conversion price — purchased by accepting coupons below the issuer’s straight-debt rate. Issuers use convertibles to borrow cheaply against their own upside (growth companies are the classic issuers; low-coupon convert waves accompany every equity bull market), with call features and soft-call provisions forcing conversion when stocks run. Where the instrument appears across this glossary’s territory: convertible-arbitrage strategies in hedge funds (trading the package against its components); convertible preferred as the standard instrument of venture and growth equity rounds — liquidation preference as the floor, conversion to common as the upside, the private-markets version of the same trade; and convertible and exchangeable notes in structured and private credit contexts, where conversion rights are lender protections priced into spread. The analysis discipline: a convertible is always two questions — is the credit good (the floor is only as solid as the issuer), and is the option worth its price (premium, volatility, and time) — and instruments marketed on one half deserve underwriting on both.
Related terms
Hybrid Security · Preferred Equity · Coupon · Venture Capital · Hedge Fund
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