Mezzanine warrants are share subscription warrants granted to the mezzanine lender in addition to the cash interest rate, giving them the right to acquire a fraction of the company's capital at a predefined price during a specified period. They constitute the equity component of mezzanine remuneration — compensating the subordinated risk through participation in exit upside — and distinguish traditional mezzanine debt from simple subordinated debt.

The mechanism: the mezzanine lender receives warrants allowing subscription of x% of diluted capital at a low exercise price (often book value at issuance). If the LBO generates a high IRR, the warrants are exercised at exit — the mezzanine lender captures part of the upside in addition to interest received during the holding period. This optionality justifies a lower cash interest rate than pure subordinated bond risk would command.

Mezzanine warrant valuation uses options pricing methods — Black-Scholes or binomial — accounting for enterprise value volatility, exercise price, maturity and risk-free rate. This valuation matters for accounting (IFRS 9 — debt/equity distinction) and for negotiating the cash rate/warrant split.

Example: a mezzanine lender invests CHF 3.0 million at 8% cash + warrants representing 3% of diluted capital at CHF 100/share exercise price (book value). At exit 5 years later, share value has quadrupled (CHF 400/share). The lender exercises warrants — warrant gain: 3% × (CHF 400 - CHF 100) × share count = CHF 540,000 additional upside, giving a total IRR of 14.2% vs 8% cash only.

At Hectelion, we value mezzanine instruments with warrants in our financial instrument valuation and structuring mandates.