Market expectation shifts in option-implied volatilities in the US and UK stock markets during the Brexit vote
Open Access
- 24 December 2021
- journal article
- Published by LLC CPC Business Perspectives in Investment Management and Financial Innovations
- Vol. 18 (4), 366-379
- https://doi.org/10.21511/imfi.18(4).2021.30
Abstract
This paper investigates the effect of the Brexit vote on the connection between UK stock market expectations and US stock market returns. To gauge UK stock market expectations, the option-implied volatilities of the FTSE 100 index are calculated in the period starting five months before and ending four months after the Brexit referendum. To keep the analysis “clean”, it stops right before the 2016 US presidential elections. It uses an OLS regression to estimate the change in the relationship between US and UK stock market expectations.The main findings show that the US and UK stock markets became somewhat less integrated four months after the Brexit referendum compared to the five months before it. The S&P 500 Index returns have a statistically significant impact on implied volatilities of the FTSE 100 only before the Brexit referendum. However, the British risk-free rate (LIBOR) became a statistically significant factor affecting FTSE 100 implied volatilities only after Brexit. This analysis may be used by decision-makers in the money management industry to act appropriately during Black Swan events. When UK citizens unexpectedly voted in favor of Brexit, the risk-free rate dropped, making it cheaper to invest, increasing the Sharpe ratios of equity portfolios. Coupled with increased uncertainty, this caused portfolio reallocations. In turn, expected volatility measured by options-implied volatility increased. AcknowledgmentThe authors would like to thank Olesia Verchenko for critique, a KSE M.A., external defense reviewer for helpful comments.Keywords
This publication has 28 references indexed in Scilit:
- Pricing European options based on the fuzzy pattern of Black–Scholes formulaComputers & Operations Research, 2004
- Factors explaining movements in the implied volatility surfaceJournal of Futures Markets, 2002
- Robustness of the Black and Scholes FormulaMathematical Finance, 1998
- Implied Risk-neutral Probability Density Functions From Option Prices: Theory and ApplicationSSRN Electronic Journal, 1998
- Recovering an Asset's Implied PDF from Option Prices: An Application to Crude Oil during the Gulf CrisisJournal of Financial and Quantitative Analysis, 1997
- Unbiased estimation of the Black/Scholes formulaJournal of Financial Economics, 1986
- Prices of State-Contingent Claims Implicit in Option PricesThe Journal of Business, 1978
- The impact of variance estimation in option valuation modelsJournal of Financial Economics, 1977
- The valuation of options for alternative stochastic processesJournal of Financial Economics, 1976
- The Pricing of Options and Corporate LiabilitiesJournal of Political Economy, 1973