OPTIMAL EXERCISE OF AN EXECUTIVE STOCK OPTION BY AN INSIDER

Michael Monoyios () and Andrew Ng ()
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Michael Monoyios: Mathematical Institute, University of Oxford, 24–29 St Giles', Oxford, OX1 3LB, UK
Andrew Ng: Mathematical Institute, University of Oxford, 24–29 St Giles', Oxford, OX1 3LB, UK

International Journal of Theoretical and Applied Finance (IJTAF), 2011, vol. 14, issue 01, 83-106

Abstract: We consider an optimal stopping problem arising in connection with the exercise of an executive stock option by an agent with inside information. The agent is assumed to have noisy information on the terminal value of the stock, does not trade the stock or outside securities, and maximises the expected discounted payoff over all stopping times with regard to an enlarged filtration which includes the inside information. This leads to a stopping problem governed by a time-inhomogeneous diffusion and a call-type reward. We establish conditions under which the option value exhibits time decay, and derive the smooth fit condition for the solution to the free boundary problem governing the maximum expected reward, and derive the early exercise decomposition of the value function. The resulting integral equation for the unknown exercise boundary is solved numerically and this shows that the insider may exercise the option before maturity, in situations when an agent without the privileged information may not. Hence we show that early exercise may arise due to the agent having inside information on the future stock price.

Keywords: Optimal stopping; executive stock options; enlargement of filtration; free boundary (search for similar items in EconPapers)
Date: 2011
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Citations: View citations in EconPapers (3)

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DOI: 10.1142/S0219024911006279

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