Why convertible arbitrage matters
The hedge reduces direction but leaves credit, volatility, borrow, liquidity, rates, and financing exposures.
How it is applied
Analyze the convertible bond’s credit, coupon, maturity, conversion ratio, embedded option, call and put provisions, borrow, dividends, volatility, rates, liquidity, and capital structure. Build a hedge using the underlying equity and adjust delta as price and volatility change. Stress default, gap moves, borrow loss, and financing.
Portfolio example
A fund buys a convertible bond for 1 million and shorts shares to offset much of its current equity sensitivity. If realized volatility exceeds what was priced, dynamic rebalancing may add value. If the issuer’s credit deteriorates and stock borrow is recalled simultaneously, both bond and hedge can lose.
How to interpret it
Convertible arbitrage seeks relative value between a convertible security and its components, often combining a long convertible with short equity and other hedges. Returns can come from volatility, credit, carry, and security mispricing. “Arbitrage” does not mean risk-free profit.
Limitations and common misconceptions
Delta changes nonlinearly, transaction costs erode frequent rebalancing, and models depend on volatility and credit assumptions. Convertibles can become illiquid during stress, prime-broker financing can tighten, and crowded funds may unwind together. Corporate actions, calls, dividends, and hard-to-borrow shares alter the payoff. Report gross and net exposures, credit quality, equity hedge, duration, implied volatility, borrow cost, leverage, and stress loss. Attribution should separate coupon, credit spread, equity hedge, volatility trading, financing, and fees. Historical returns from calm issuance environments may not represent crisis liquidity. Investors should judge the full portfolio and funding structure, not a theoretically hedged trade in isolation. A convertible’s bond floor is an estimate that can fall with credit quality, rates, and liquidity. Its equity option may become more or less dominant as the stock moves, changing the trade from credit-like to equity-like. Managers can hedge interest rate, credit, and currency in addition to delta, but hedges introduce basis and cost. New issuance terms and dealer balance-sheet capacity influence the opportunity set. Fund redemption terms should reflect that exits can be difficult during synchronized deleveraging. Investors should ask whether returns rely on stable access to stock borrow and balance-sheet financing. These resources can disappear together precisely when theoretical dislocations become widest.
Sources and further reading
- Hedge FundsU.S. Securities and Exchange Commission, Investor.gov
- Introduction to Alternative InvestmentsCFA Institute