Capital Structure Arbitrage
Capital Structure Arbitrage is a hedge fund strategy that exploits pricing inconsistencies between different securities issued by the same company — such as equity, bonds, loans, and credit default swaps — by taking offsetting long and short positions at different points in the capital structure to capture perceived mispricings.
Every public company with debt in its capital structure has multiple traded claims on its cash flows and assets: common equity, preferred equity, senior secured bonds, subordinated bonds, leveraged loans, and in many cases credit default swaps (CDS). Each of these instruments reflects the market's assessment of the company's creditworthiness and equity value, but because they are traded in different markets with different participant bases, they do not always price consistently with one another. Capital structure arbitrage attempts to capture these inconsistencies.
The most common trade involves the relationship between equity volatility and credit spreads. Merton's structural model of credit risk demonstrates that both equity and debt can be viewed as options on the firm's asset value — equity is a call option on the assets, while debt is equivalent to a risk-free bond minus a put option on the assets. Because of this relationship, there is a theoretical connection between implied equity volatility and credit default swap spreads. When one appears mispriced relative to the other, the arbitrageur can go long the cheap instrument and short the expensive one.
A concrete example: if a company's CDS spread implies a high probability of default while its stock price (and implied volatility) remains elevated, a capital structure arbitrageur might buy the CDS (effectively shorting the credit) while also purchasing equity options or going long the stock — reasoning that if the company truly distresses, the CDS pays off, while if it recovers, the equity gains. The position is designed to profit from convergence between the equity and credit markets' assessments of the same underlying business.
Capital structure arb can also be expressed through relative value trades across different parts of the debt structure itself. For example, if a company's senior secured bonds trade at a spread that implies lower recovery rates than its subordinated bonds, there may be an opportunity to buy the seniors and short the subordinates. Similar trades can be constructed between bonds and leveraged loans, or between on-the-run and off-the-run bonds from the same issuer.
The strategy requires deep credit analysis, sophisticated option pricing, and the ability to trade across equity, fixed income, and derivatives markets simultaneously. Execution complexity is high, as the relevant instruments trade in fragmented, over-the-counter markets with varying liquidity. The strategy has historically performed well during periods of credit stress when mispricings are largest, but carries meaningful mark-to-market risk as mispricings can widen before correcting — a phenomenon that has forced liquidations at inopportune times.