Students t-Distribution Based Option Sensitivities: Greeks for the Gosset Formulae

European options can be priced when returns follow a Students t-distribution, provided that the asset is capped in value or the distribution is truncated. We call pricing of options using a log Students t-distribution a Gosset approach, in honour of W.S. Gosset. In this paper, we compare the greeks for Gosset and Black-Scholes formulae and we discuss implementation. The t-distribution requires a shape parameter u to match the fat tails of the observed returns. For large u, the Gosset and Black-Scholes formulae are equivalent. The Gosset formulae removes the requirement that the volatility be known, and in this sense can be viewed as an extension of the Black-Scholes formula.