Convertible Securities
Convertible securities are commonly bonds, notes or preferred shares that can convert into common stock or another security under specified terms.
Common forms
Convertible securities can include:
- convertible bonds
- convertible notes
- convertible preferred stock
The holder often controls whether conversion occurs.
Some securities allow issuer-forced conversion under specified conditions.
Basic fixed-conversion example
A $1,000 convertible note converts at:
$20 per share
Conversion ratio:
50 shares
If the stock later trades at $30, conversion value is:
$1,500
before accrued interest and other terms.
Why companies issue convertibles
Convertible financing can allow a company to:
- pay a lower coupon than straight debt
- defer common-share issuance
- attract investors seeking equity upside
- raise capital when ordinary equity is expensive
The cash financing cost can look attractive.
Future dilution can be substantial.
Fixed vs. variable conversion
Investor.gov distinguishes conventional fixed-price convertibles from structures whose conversion formula varies with market price.[1]
A variable-price structure can become dangerous:
- stock price falls
- conversion requires more shares
- dilution rises
- additional selling pressure can develop
The conversion formula can matter more than the coupon.
Real 2026 disclosure
A 2026 registration statement disclosed convertible notes that could convert into millions of common shares and warned that additional issuance could dilute existing shareholders.[2]
That is the central trade-off:
capital today versus potential ownership dilution later.
Conversion can improve leverage
When convertible debt becomes common equity:
- debt declines
- interest expense can decline
- shares outstanding rise
Credit metrics can improve while per-share ownership weakens.
The same transaction can reduce financial risk and increase dilution.
Conversion premium
Assume:
- current stock price: $20
- conversion price: $26
Conversion premium:
30%
The stock must rise substantially before the conversion value exceeds principal based solely on share value.
Other terms can change the economics.
Calls and forced conversion
Some convertibles can be called after specified conditions are met.
A call can push the investor toward:
- conversion
- redemption
That changes duration and upside.
Convertible preferred stock
Preferred stock can retain:
- dividend priority
- liquidation preference
until conversion.
After conversion, the holder moves into common equity.
The security changes position within the capital stack.
Dilution limits
Agreements can include:
- ownership blockers
- exchange caps
- conversion caps
These may restrict immediate issuance.
They do not necessarily eliminate long-term dilution.
Common mistakes
"Convertible debt is already equity."
No.
"Conversion always hurts common shareholders."
Not necessarily.
"A low coupon means cheap financing."
Not if the embedded equity option is valuable.
"Every convertible uses a fixed conversion price."
No.
Example
A $1,000 note convertible at $20 per share can become 50 common shares.
Professional note
Model both states: before conversion and after conversion. Calculate debt removed, interest saved, new shares created and ownership dilution. Variable-price structures deserve extra scrutiny because falling stock prices can increase the required share issuance.
Related terms
- Capital stack
The hierarchy of claims on a property's cash flow, from senior debt through preferred equity to common equity.
- Long-Term Debt
Long-term debt generally refers to borrowings whose repayment extends beyond the current period. It can include bonds, senior notes, term loans and subordinated debt.
- Preferred Stock
Preferred stock is an equity security that generally ranks ahead of common stock for dividends and liquidation proceeds, subject to its specific terms.
- Share Dilution
Share dilution occurs when new shares or share equivalents increase the ownership denominator and reduce an existing shareholder’s percentage claim unless the holder participates proportionally.
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