A warrant looks like an option, but exercising it creates brand-new shares — diluting existing shareholders in a way an exchange-traded option never does.
How it works
A standalone Black-Scholes call value is computed first, then scaled down by the dilution factor — shares outstanding divided by shares outstanding plus warrants outstanding — to approximate the warrant’s true per-unit value.
What this does not include
This does not include the more rigorous Galai-Schneller adjustment, which instead adjusts the stock price itself before pricing rather than simply scaling the final option value — a more precise but more complex approach that typically produces a similar result.
How to use this calculator
- Enter spot price, strike price, risk-free rate, volatility, time to expiry, shares outstanding, and warrants outstanding.
Frequently asked questions
Why does a warrant’s value differ from an identical option’s value at all?
Purely because of dilution — exercising an option transfers existing shares, while exercising a warrant issues new ones, spreading the company’s value across a larger share count and reducing the warrant’s per-unit value relative to an identical option.
Do warrants expire like options?
Yes, though warrants often have much longer expiration periods than typical exchange-traded options — sometimes several years.
Are warrants commonly attached to other securities?
Yes — warrants are frequently bundled with bonds or preferred stock as a “sweetener” to make the primary security more attractive to investors, and also commonly used in SPAC transactions.
