The AI gold rush has reached a corner of finance that most people never think about: convertible bonds. Investors in this hybrid debt market are quietly surrendering protections they’ve held dear for decades, all for the privilege of riding the AI wave.
Global zero-coupon convertible bond issuance hit $72 billion year-to-date as of late August, putting 2026 on track to surpass the previous full-year record of $73 billion set just last year. US convertible issuance alone reached $57 billion in the first half of 2026, the highest figure ever recorded for that period.
The terms are getting aggressive
Zero-coupon convertibles are exactly what they sound like: bonds that pay no interest. The investor gets nothing while they wait, banking entirely on the conversion option, the right to swap debt for equity at a predetermined price, to make the trade worthwhile.
Conversion premiums, the markup above a company’s current stock price at which bondholders can convert to shares, have climbed to eye-watering levels. Cloudflare’s August 2026 notes carried a 60% premium. That means the stock needs to rally more than 60% from the issuance price before conversion starts to pay off.
The roster of issuers tells the story of where all this capital is flowing. Akamai Technologies raised $3.5 billion through zero-coupon convertibles. Oracle tapped the market for $5 billion. CoreWeave, the GPU cloud provider that has become a linchpin of AI infrastructure, pulled in $4 billion. Cloudflare added its $2.5 billion to the pile.
Why investors are playing along
Convertible bonds offer a middle path between pure debt and pure equity. In a normal environment, you get a coupon payment as a floor and conversion optionality as a ceiling. The bond floor, meaning the value of the bond as straight debt even if the stock tanks, provides downside protection.
AI stocks carry elevated volatility, and in the convertible bond world, volatility is the secret ingredient. Higher stock volatility makes the embedded conversion option more valuable, which is why investors are willing to accept zero coupons and sky-high premiums. They’re essentially buying volatility exposure dressed up as a bond.
For issuers, it’s an extraordinary deal. Companies get to borrow at zero percent interest and only dilute shareholders if the stock price climbs dramatically.
Signs of friction are emerging
Not everyone is thrilled with the direction of travel. Recent deals have seen some pushback from the buy side, particularly around dilution concerns. Investors have started requesting capped calls, derivative structures that limit the dilutive impact on existing shareholders by effectively raising the effective conversion price even higher.
Costs for investors have also ticked up slightly on some recent deals, suggesting that the balance of power hasn’t shifted entirely to issuers.
Convertible bonds with zero coupons and elevated premiums perform well in a rising market. In a downturn, they can behave worse than traditional bonds because the conversion option becomes worthless and there’s no coupon income to cushion the fall. Investors effectively own a deeply discounted bond with no yield, which is a painful place to be during a correction.