One security contains two economic exposures
A convertible bond is debt with a contractual path into another security, commonly the issuer's common shares. Investor.gov explains that conventional conversion formulas generally use a fixed price, while other financings can use market-price-based formulas with very different dilution risks. Who can initiate conversion and when depends on the instrument. The word convertible is therefore the beginning of the analysis, not a complete description. [1]
The intuitive trade is straightforward. An investor accepts a package containing credit exposure and a chance to participate in equity appreciation. The issuer may obtain a lower cash coupon than a comparable straight-debt financing would require, while giving up some future equity upside or accepting another conversion-settlement obligation. The lower coupon is not free financing. The option embedded in the security has economic value even if no separate option premium appears on the income statement.
The conversion ratio and its implied price
Assume a hypothetical $1,000 face-value bond converts into twenty common shares. Dividing $1,000 by twenty produces a $50 conversion price. At a $40 share price, the conversion value is $800; at $60 it is $1,200; at $80 it is $1,600. This is simply the current value of the specified shares, not a prediction of the bond's market price or a guarantee that immediate conversion is permitted.
Suppose the bond itself trades at $1,300 when the shares are $60. Its $100 excess over the $1,200 conversion value represents a premium to immediate stock value. The premium might reflect remaining option time, coupons and bondholder rights. Paying $1,300 and immediately converting into stock worth $1,200 would sacrifice $100 before transaction costs. That observation explains why an in-the-money conversion option does not automatically make immediate exercise attractive.
If the stock later rises to $70, the twenty shares would be worth $1,400. A buyer who paid $1,300 could then have $100 of gross appreciation through the assumed conversion outcome, plus any separately received coupons. The original conversion price of $50 was not that buyer's economic break-even. Acquisition price and subsequent cash flows matter just as much as the contractual conversion ratio.
The bond floor is an estimate, not insurance
Analysts sometimes describe a convertible as a straight bond plus an equity option. The straight-bond component is often called the bond floor. It is a valuation estimate based on the issuer's credit risk, remaining coupons, maturity and seniority. It is not a contractual guarantee that the market price cannot fall beneath a quoted model value. FINRA's bond education emphasizes the distinction between promised payments and the issuer's ability to make them. [2]
In a simplified example, a five-year $1,000 bond with a 2% annual coupon has five $20 payments and $1,000 principal at maturity. Discounting those payments at 6% gives a straight-bond value of about $831.51. At 12%, the same promised payments are worth approximately $639.52. If financial distress simultaneously lowers the share price and raises the required credit return, both parts of the convertible's economic package can deteriorate together.
That interaction limits the attractive-sounding phrase equity upside with bond protection. The bond component may soften a moderate stock decline when credit remains sound. It provides much less comfort when the stock decline signals serious doubts about repayment. A floor constructed from yesterday's cannot be treated as a standing bid from a solvent counterparty.
A real financing shows why the fine print matters
In an August 2025 announcement filed with the SEC, TeraWulf described convertible notes with an initial conversion rate of 80.4602 shares per $1,000, approximately a $12.43 conversion price. The announcement included conditional conversion provisions, cash repayment of principal upon conversion with cash or share settlement of excess value (with share settlement then conditional on stockholder approval to increase authorized shares), and an issuer redemption feature beginning in September 2028 subject to a share-price test. This is an illustration of documented issuance terms, not a current trading recommendation or confirmation of subsequent outstanding balances. [3]
A rate such as 80.4602 rather than a round twenty also shows why rounding can matter across a large issue. A million dollars of face amount represents one thousand $1,000 units. A small error in the assumed shares per unit becomes a larger error when aggregated. Corporate events and contractual adjustments can change the applicable rate, so the original press release cannot replace the current indenture and subsequent notices.
Share settlement and cash settlement create different burdens
Return to the fictional twenty-share bond when stock is $60. Physical settlement would deliver twenty shares worth $1,200. A simplified cash settlement would instead pay $1,200. A hypothetical combination might pay $1,000 cash plus shares worth the $200 excess, about 3.333 shares at that assumed price. Actual averaging periods, rounding and issuer elections can produce different outcomes. The contract decides which alternatives exist.
All three examples deliver the same assumed gross value but have different consequences for the issuer. Twenty newly issued shares increase ownership units directly. Cash settlement preserves the share count but requires . Combination settlement uses both resources. Describing every convertible as certain future issuance of the full conversion share count can therefore overstate dilution for some structures and understate cash needs for others.
Dilution and the use of financing proceeds
Imagine a company with ten million shares outstanding issues $50 million of bonds convertible at $50 per share. Full physical conversion would create one million shares, taking the total to eleven million. An existing holder of 100,000 shares moves from 1% ownership to about 0.909%. The number of shares owned has not changed; the fraction of the company represented by those shares has.
The denominator is only half the story. The company received $50 million when it issued the bonds. If that money financed productive assets, the business may be more valuable than it would have been without financing. If it funded losses with little enduring benefit, the outcome may be worse. A dilution calculation describes ownership mechanics; it does not independently establish whether the original financing created or destroyed economic value.
Suppose pre-conversion annual earnings are $20 million and include $1 million of interest on the convertible. Ignoring taxes, full conversion removes that interest and raises earnings to $21 million while increasing shares to eleven million. Simplified earnings per share become about $1.91 rather than $2.00. This is an economic illustration, not a substitute for accounting rules governing diluted EPS, period weighting and anti-dilutive instruments.
Calls can shorten the option's practical life
An issuer call provision can pressure holders to decide between conversion and redemption earlier than final maturity. A typical conditional call might require the stock to exceed a specified multiple of the conversion price over a defined observation period, but those thresholds are deal-specific. The TeraWulf announcement provides one actual example of such a condition. [3]
Stated maturity can differ from the period during which the equity option remains outstanding. A five-year maturity does not necessarily supply five uninterrupted years of optionality. Conversely, weak equity performance may leave the debt outstanding until repayment is due, concentrating refinancing pressure when equity issuance is least attractive. The same financing can behave like equity in success and debt in disappointment.
Conventional does not mean universal
Investor.gov warns that market-price-based conversion formulas can require increasingly large share issuance as the stock falls. That is different from the fixed twenty-share example, where a price decline reduces conversion value without mechanically increasing the basic share entitlement. Fixed-ratio instruments may still contain adjustment provisions, but those should not be confused with an uncapped floating-price financing. [1]
Face amount, coupon, maturity, seniority, conversion terms, settlement alternatives, calls, repurchase provisions and rate adjustments jointly determine the financing obligation. The repayment case and the equity-success case can place very different demands on the issuer. Convertible financing reallocates cash cost, credit risk and future ownership; it does not make any of them disappear.
Sources
- SEC Investor.gov, Convertible Securities; checked October 4, 2026Official sourceBack to text: ↑1↑2↑3
- FINRA, Bonds; checked October 4, 2026SourceBack to text: ↑
- TeraWulf, convertible-note pricing announcement filed as Exhibit 99.1, August 2025; checked October 4, 2026Filing / reportBack to text: ↑1↑2