Convertible Bonds:
The Hybrid That Behaves Like Neither a Bond Nor a Stock

Using CoreWeave's $3.5 billion convertible note issuance to understand the mechanics, valuation, and strategic logic behind one of finance's most elegant instruments.

📅 April 2026 ⏱ 10 min read 📊 2 interactive widgets

The Deal That Opens This Topic

On April 10, 2026, CoreWeave — the AI cloud infrastructure company that went public on Nasdaq in March 2025 — priced a $3.5 billion offering of convertible senior notes due 2032. The deal was upsized from an initial $3.0 billion target before pricing, a signal of intense institutional demand. CoreWeave also granted purchasers an overallotment option for an additional $500 million, bringing the potential total to $4.0 billion. This was CoreWeave's second convertible offering in five months — it had raised $2.587 billion in December 2025 under similar terms.

Why would a high-growth AI company with existing senior notes at 9.25% and 9.00% issue new debt at just 1.75%? And why would sophisticated institutional investors accept a coupon that barely beats inflation? The answer lies in understanding what a convertible bond actually is.

CoreWeave 1.75% Convertible Senior Notes — April 2026 Term Sheet
Principal
$3.5 billion
Coupon
1.75% p.a.
Maturity
Oct 1, 2032
Settlement
Apr 14, 2026
Stock at pricing
$92.00
Conversion price
$119.60
Conv. premium
+30%
Conv. ratio
8.3612 shares/$1k
Capped call ceiling
$230.00 (+150%)
Capped call cost
$430.5 million
Net proceeds (est.)
$3,447.5 million
Overallotment
+$500 million

What Is a Convertible Bond?

A convertible bond is a corporate bond that gives the holder the right — but not the obligation — to convert the bond into a predetermined number of shares of the issuer's stock at a predetermined price. Until conversion, it pays interest like a regular bond. If the stock performs well, the holder converts and participates in the equity upside. If the stock disappoints, the holder keeps the bond and collects coupons until maturity.

"A convertible bond is a straight bond with an embedded call option on the issuer's stock. You are paid to wait — and optionally rewarded if the equity performs."

This decomposition — convertible = straight bond + embedded call option — is the analytical foundation for everything that follows. These two components have different value drivers, which is why the bond's behaviour shifts so dramatically depending on where the stock trades.

The Three Personalities of a Convertible

The behaviour of a convertible shifts dramatically depending on where the stock trades relative to the conversion price. There are three distinct regimes.

Stock far below conv. price
🔴 Behaves like a Bond

The equity option is deep out-of-the-money and nearly worthless. Price sensitivity is driven by interest rates and credit risk — not the stock.

Stock near conv. price
🟡 Hybrid Zone

Both the bond floor and the equity option contribute meaningfully. The bond responds to equity moves but retains interest rate sensitivity.

Stock far above conv. price
🟢 Behaves like Equity

The option is deep in-the-money and dominates value. The bond price moves one-for-one with the conversion value. Conversion becomes rational.

The Anatomy of a Convertible Bond

Click any concept below to see its definition, the full worked calculation using CoreWeave's April 2026 numbers, and the key exam insight.

The Anatomy of a Convertible Bond — CoreWeave Case Study
All calculations use CoreWeave April 2026 offering · Stock price at pricing (Apr 9, 2026): $92.00 · SBV uses 9.00% YTM (= CoreWeave existing Sr Notes due 2031) · Semi-annual discounting · 13 periods

Why Issue? Why Buy?

🏢 Why CoreWeave Issued at 1.75%
›Drastically cheaper debt. 1.75% vs 9%+ on existing notes — roughly $253 million in annual interest savings on $3.5 billion.
›Deferred dilution. Shares only issued if stock rises above $119.60. Below that, the bond is repaid in cash at maturity.
›GPU infrastructure capital. Proceeds fund data center expansion to fulfil AI cloud contracts at a time when compute demand vastly outpaces supply.
›Repeat signal. Second convertible in five months, upsized both times — the market is endorsing this as CoreWeave's preferred funding vehicle.
📈 Why Institutions Bought at 1.75%
›Asymmetric payoff. Downside floored by bond value; upside is equity participation. Bond-like protection with equity-like upside potential.
›Mandate flexibility. Fixed income funds cannot hold common stock — convertibles let them express an equity view within their mandate.
›AI infrastructure exposure. Controlled entry into the CoreWeave equity story — bullish on the thesis but not at full equity volatility.
›Senior ranking + subsidiary guarantees. Notes rank senior, fully and unconditionally guaranteed by all major subsidiaries.

The Capped Call — CoreWeave's Dilution Shield

Alongside the convertible offering, CoreWeave spent $430.5 million to purchase capped call options from investment banks. This is a separate transaction — not part of the note terms — whose sole purpose is to protect existing shareholders from dilution.

The Three Zones of the Capped Call
Zone 1
Stock below $119.60
No conversion. Bond repaid in cash. Capped call expires worthless. Zero dilution.
Zone 2 — Protected
$119.60 → $230.00
Bond converts. Capped call pays CoreWeave the difference. Net dilution to existing shareholders: zero.
Zone 3 — Above Cap
Stock above $230.00
Above $230 CoreWeave issues equity from its balance sheet — but existing shareholders are already up +150%.

In structural terms, the capped call is a bull call spread: CoreWeave bought a call at $119.60 and sold a call at $230.00. The $430.5m premium came from the offering proceeds — a real capital allocation decision costing ~12% of the deal size.

Live Payoff Simulator

The three curves are drawn once and remain fixed. Drag the slider to move the live marker along the convertible bond value curve and see exactly where the current stock price sits relative to both floors.

Live Payoff Simulator — CoreWeave 1.75% Conv. Notes 2032
$92
$20 ▲ Conversion price: $119.60 $300
Stock Price
$92
Conv. Value
$769
Bond Floor (SBV)
$649
Conv. Bond Value
$1,000
Convertible Bond Value Conversion Value (Parity) Straight Bond Floor (SBV) Your position
SBV calculated at 9.00% YTM (semi-annual, 13 periods) = $649 · Conv. ratio 8.3612 · Conversion price $119.60 · Option value modelled using moneyness-based S-curve · Not investment advice
RUQQI STUDY STRATEGY — CONVERTIBLE BONDS
  • Always decompose: convertible = straight bond + embedded call on issuer's equity. Each component has different value drivers.
  • The straight bond value and conversion value are two simultaneous floors. The convertible always trades above both. Minimum value = max(SBV, conversion value).
  • The market conversion premium is the price of downside protection. It shrinks as the stock rises (bond becomes equity-like) and can widen as the stock falls (bond floor kicks in).
  • The capped call is a bull call spread that protects existing shareholders from dilution between the conversion price and the cap — at a real cash cost to the issuer.
  • For diluted EPS: add back after-tax coupon interest to the numerator, add conversion shares to denominator. Only include if the result is dilutive (EPS goes down). In loss years, convertibles are anti-dilutive and excluded entirely.
  • CoreWeave's April 2026 deal is the textbook template: 30% conversion premium, 9% coupon saved, capped call at +150%, upsized twice. Every structural feature has a clear economic rationale on both sides of the transaction.