What Does a 0% Convertible Note Really Cost? Cloudflare's $2.5 Billion Answer

Cloudflare borrowed $2.5 billion on Thursday and agreed to pay no regular interest for five years. This sounds like the kind of financing founders describe to each other immediately before someone checks the footnotes.

The footnotes contain an equity option.

The notes can initially convert into about 5.03 million Class A shares. Cloudflare also paid $259.5 million for derivative contracts designed to offset conversion dilution across a defined share-price range. The coupon is zero because investors received something valuable in its place: the protected downside of senior debt and access to Cloudflare's future stock appreciation.¹

That exchange can be excellent financing. It can also be discussed so badly that a board hears “free debt,” employees hear “no dilution,” and the finance team receives a five-year obligation with an options desk attached.

Cloudflare's filing gives founders a clean worked example. It shows where a convertible's cost actually sits, why a capped call is a limited shield, and which numbers deserve a place beside the advertised coupon.

This article discusses US public-company convertible debt and reflects filings available through August 14, 2026. Early-stage convertible notes use different conversion mechanics, though the central bargain is related. Nothing here is legal, tax, accounting, or investment advice, and the indenture and hedge confirmations control the actual result.

Cloudflare issued $2.5 billion of 0% Convertible Senior Notes due August 15, 2031. The notes do not accrete, which means the principal does not quietly grow while everyone enjoys the zero on the term sheet. They are senior unsecured obligations, rank alongside Cloudflare's other unsubordinated unsecured debt, and can become convertible after specified stock-price, trading-price, redemption, or corporate-event triggers.¹

The initial conversion rate is 2.0123 Class A shares for every $1,000 of principal. Divide $1,000 by 2.0123 and you get the initial conversion price: about $496.94 a share. Cloudflare used $310.59, its August 10 closing price, as the reference. The conversion price therefore began 60% above the stock.¹

Two claims can both be true:

• No shares were necessarily issued when the notes closed.
• Existing holders now face a contractual path to future economic dilution.

The first claim describes today. The second describes the instrument.

Convertible investors accept a lower coupon because the conversion right has value. A modern convertible can be understood as straight debt plus a call option on the issuer's stock. The investor keeps a debt claim if the share price disappoints and participates in upside if it performs. This is less romantic than “patient growth capital,” though it has the advantage of being the transaction.²

The respectable phrase is equity participation. It means the lender stopped charging you for the loan and started charging you for the good years.

Cloudflare can choose cash, shares, or a combination when settling conversions, subject to the indenture. That choice affects the form of the cost. Cash settlement preserves the share count and consumes liquidity. Share settlement preserves cash and increases the denominator. A combination lets the company choose which organ feels the procedure.

Cloudflare received approximately $2.4623 billion after discounts, commissions, and estimated offering expenses. It then used $259.5 million for capped calls. About $2.2028 billion remained for general corporate purposes, including possible capital expenditure, debt repayment, acquisitions, and strategic transactions.¹

Put those numbers on the same page:

The company gained roughly $2.203 billion of usable cash and accepted a $2.5 billion maturity obligation, plus the conversion economics. The $297.2 million gap between usable cash and principal is real before a single conversion occurs. Most of it is the capped-call premium; the rest is issuance cost.

This does not make the deal bad. Cloudflare bought five years of capital without regular cash interest, retained settlement flexibility, and set the initial conversion price far above the reference stock price. Those are valuable features. They were purchased through option value and cash paid elsewhere in the structure.

Calling the financing free because the coupon is zero is like calling an accelerator free because tuition is zero while it owns 7% of the company. The invoice did not disappear. It changed columns.

There is also maturity risk. If the notes have not converted, been repurchased, or been redeemed by August 2031, principal comes due. If Cloudflare's stock stays below the conversion price, the equity option may expire without producing shares, yet the debt still needs $2.5 billion. Downside protection is the feature noteholders brought to the meeting.

Founders comparing a convertible with straight debt should ask for the missing counterfactual: what coupon and covenants would the company pay on otherwise comparable non-convertible debt? The discount from that hypothetical coupon is part of what the option bought. A 0% figure alone cannot answer whether the capital is cheap.

Cloudflare paired the notes with capped calls from financial-institution counterparties. The contracts generally offset conversion dilution, or cash owed above principal, while the share price sits between two important levels:

• Strike price: approximately $496.94, matching the initial conversion price.
• Cap price: approximately $854.12, equal to 175% above the $310.59 reference price.

Below the strike, the note's initial conversion value is below principal and the capped call has no economic work to do. Between the strike and cap, the capped call is designed to offset the note's conversion value above principal. Above the cap, the protection stops growing while the note's conversion value continues.¹²

Here is a simplified illustration for one $1,000 note using the initial terms. It ignores adjustments, timing conventions, taxes, counterparty exposure, and settlement details:

At $600, the derivative roughly absorbs the conversion value above $1,000. At $900, the share price has crossed the cap. The note keeps participating while the capped-call payoff has reached its ceiling. Dilution, or an equivalent cash cost, returns above the cap.

This is the part often summarized as “the capped call eliminates dilution.” It eliminates an interval. The cap is present because the bank selling protection also enjoys limits, a charming preference financial institutions occasionally express.

The $259.5 million premium bought that interval for the shares initially underlying the notes. It did not retire the debt, remove the conversion right, or guarantee that counterparties will perform under every circumstance. The derivative is a separate contract. Noteholders have no rights under it.¹

The right board question is therefore not “Did we hedge dilution?” Ask: “Between which prices, for how many shares, against which counterparties, and what happens above the cap?” A sentence with four nouns usually beats a slide with a shield icon.

Cloudflare has already run this financing cycle once, which means the new notes were signed by a company that can already see how the last set turned out. The 2021 vintage matures this month, in roughly the condition its investors were hoping for.

In August 2021 Cloudflare priced 0% notes due August 15, 2026. Those notes began with a $191.34 conversion price, based on 5.2263 Class A shares per $1,000 note. Cloudflare paired them with capped calls whose initial cap price was about $250.94.³

On August 10, 2026, the reference price for the new offering was $310.59. Use that price only as an illustration of the old instrument's geometry:

• The 5.2263 shares underlying each old $1,000 note had a gross value of about $1,623.24.
• The old capped call protected only up to its roughly $250.94 initial cap, subject to later adjustments and the actual contract.
• Stock value above that cap sat outside the original protection range.

The old note did exactly what its investors paid for: it preserved principal exposure and captured a large stock increase. The zero coupon did not erase financing cost. It postponed the visible part until Cloudflare's success made the option valuable.

That is the convertible bargain at its most revealing. A weak stock outcome leaves the company with debt to repay. A strong outcome makes conversion valuable. Management gets cheaper cash today in exchange for a future fork where either liquidity or ownership absorbs the consequence.

The company's new filing says proceeds may be used to repay outstanding indebtedness. It does not allocate the new financing specifically to the 2026 notes, so the two should not be presented as a one-for-one refinancing. They still belong on the same founder whiteboard: one zero-coupon issue reaches maturity while another begins its five-year life.¹

Wall Street calls this liability management. Founders may recognize the experience as renewing an obligation whose earlier version has now developed opinions about the share price.

An early-stage convertible note usually converts during a future equity financing using a valuation cap, a discount, or both. The company is private, its stock has no daily market price, and the conversion bargain is negotiated around the next round.

Cloudflare's note is a public-market security. It has a fixed initial conversion rate, market-price tests, redemption provisions, a fundamental-change repurchase right, detailed settlement mechanics, and an institutional hedging ecosystem. Nobody should paste its indenture into a seed round unless the objective is to make both founders resign before lunch.

The family resemblance still matters. Both instruments let a company delay issuing equity today while defining a path to equity tomorrow. Both can make the present financing look cleaner than its fully converted effect. Both require a cap table that models the conversion rather than placing the note in a tasteful grey box labelled “debt.”

For a private company, include every note and SAFE in the next-round ownership model. For a later-stage or public company, add conversion price, maximum shares, capped-call coverage, settlement election, make-whole adjustments, maturity cash, and change-of-control obligations.

Economic dilution and voting dilution also need separate columns. Cloudflare's notes convert into Class A shares, and its dual-class stock structure gives Class B holders enhanced voting rights, so issuing Class A can move economics more than control. The percentage changes and the steering wheel does not. That asymmetry is most of the reason dual-class structures keep surviving their own annual meetings.

Before approving convertible debt, make management and advisers provide one page with these figures:

1. Usable cash. Show gross principal, discounts, fees, hedge premiums, repurchases, and actual cash left for operations.
2. Straight-debt alternative. Estimate the coupon, covenants, security, and maturity the company would face without a conversion option.
3. Initial and maximum shares. Model the base conversion rate and any make-whole increases. Translate both into fully diluted ownership.
4. Settlement demand. Show cash, shares, and combination outcomes at maturity and upon earlier conversion.
5. Protection range. State the capped-call strike, cap, covered share count, cost, counterparties, and failure exposure.
6. Price scenarios. Calculate outcomes below the strike, between strike and cap, and above the cap. Include the share price where existing control thresholds change.
7. Maturity plan. Name the source of repayment if the stock never clears the conversion price. “Future financing” is an assumption wearing the company hoodie.

Then run the same page at acquisition. A fundamental change can give holders a cash repurchase right and, in some cases, an increased conversion rate. The note may therefore become an M&A claim precisely when the board wants flexibility. Read the indenture before announcing that strategic options remain wide open.

Cloudflare's financing may prove extremely efficient. If the capital compounds faster than its eventual cash and equity cost, shareholders benefit. The correct decision is comparative, not moral. Cheap debt, expensive equity, and a valuable investment opportunity can make a convertible the best available instrument.

The decision still begins with honest nouns. Cloudflare raised debt, granted conversion rights, and bought a limited hedge. Zero percent describes one line.

Before your next board meeting, move the option onto the financing summary. Put the usable cash beneath the principal. Mark the cap where dilution returns. If the deal remains attractive after that page, approve it for the right reason.

The coupon can stay at zero. The analysis cannot.