Manipulation in the VIX?

At the settlement time of the VIX Volatility Index, volume spikes on S&P 500 Index (SPX) options, but only in out-of-the-money options that are used to calculate the VIX, and more so for options with a higher and discontinuous influence on VIX. We investigate alternative explanations of hedging and coordinated liquidity trading. Tests including those utilizing differences in put and call options, open interest around the settlement, and a similar volatility contract with an entirely different settlement procedure in Europe are inconsistent with these explanations but consistent with market manipulation. Large transient deviations in prices demonstrate the importance of settlement design

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Year of publication:	2017
Authors:	Griffin, John M.
Other Persons:	Shams, Amin (contributor)
Publisher:	[2017]: [S.l.] : SSRN
Subject:	Volatilität \| Volatility \| Aktienindex \| Stock index \| Index \| Index number \| Handelsvolumen der Börse \| Trading volume \| Betrug \| Fraud \| Manipulation \| Indexderivat \| Index derivative

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