Understanding Convertible Bonds (CBs) and Bonds with Warrants (BWs)

Two instruments that blend the character of a bond and a stock -- here's how they differ.

What is a convertible bond (CB)?

A convertible bond is a bond that also carries the right to convert into company stock at a preset price, called the conversion price, once certain conditions are met. If the share price stays below the conversion price, the investor simply keeps collecting interest and principal like a normal bond; if the stock rises above it, the investor can convert and capture the upside. This built-in option lets companies borrow at a lower interest rate than a plain corporate bond would carry.

What is a bond with warrants (BW)?

A bond with warrants keeps the underlying bond fully intact while attaching a separate warrant that lets the holder buy newly issued shares at a preset price. Unlike a convertible bond, exercising the warrant doesn't cancel the bond -- the holder has to pay an additional amount of cash to receive the new shares. Some BWs are issued in detachable form, meaning the warrant can be separated and traded entirely on its own.

The key difference between a CB and a BW

Converting a CB retires the bond -- the principal itself is used to pay for the new shares, turning debt on the company's books into equity. Exercising a BW's warrant requires a fresh cash payment instead, so the original bond stays outstanding as debt while the company also receives new capital from the warrant exercise.

Conversion price and refixing

Many convertible bonds include a refixing clause that lowers the conversion price, within limits, if the stock price falls well below its level at issuance. Refixing is meant to protect investors, but in a falling market it means the same bond converts into more shares as the price resets lower, diluting existing shareholders further. In some markets, regulations cap how far the conversion price can be reset downward, so it isn't unlimited.

Put options and guaranteed yield

Even a CB or BW with a low or 0% coupon often carries a put option letting the investor demand repayment of principal plus a guaranteed yield to maturity at set points before the bond matures. This gives the instrument real bond-like downside protection when the stock performs poorly, but it also means the issuing company may have to repay a large sum earlier than expected, straining its cash position.

Dilution risk to check before investing

Checking the issue size relative to market capitalization, the conversion price relative to the current share price, and when conversion becomes eligible -- all disclosed in the bond's prospectus or regulatory filings -- helps gauge how much potential share overhang could hit the market later. A CB or BW announcement often causes a company's stock to dip on exactly this overhang concern.

Check the bond's prospectus or regulatory filing

Details like issue size, coupon, yield to maturity, conversion price, the window during which conversion is allowed, and any refixing terms are all spelled out in the bond's prospectus or the issuer's regulatory disclosures. It's worth reading the original filing rather than relying on secondhand summaries.

This page is educational, not investment advice

This page is meant for general information and isn't investment advice about any specific security. Actual issue terms vary widely from one bond to the next, so always review the original disclosure documents before investing.

Frequently Asked Questions

Why does a stock drop just on news of a CB issuance?

The market prices in a future dilution concern -- once the announcement is confirmed, investors anticipate that shares created by future conversion will eventually hit the market. This concern tends to be stronger when the conversion price is set below the current share price or when a refixing clause is included.

How can I tell if conversion has already happened?

Checking the issuer's regulatory filings for conversion or warrant exercise disclosures will show the quantity already converted or exercised, along with the new shares that resulted. Comparing that against the original issue size lets you estimate how much potential dilution is still outstanding.